Fixes multivalue header bypass in RBAC.

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

For in-cluster Cloud Service Mesh, upgrade your cluster to one of the following patched versions:

• 1.28.5-asm.9
• 1.27.8-asm.7
• 1.26.8-asm.3

If you're using Cloud Service Mesh v1.25 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. Upgrade to version 1.26 or later.

For managed Cloud Service Mesh, follow the instructions in the MSA. All versions remain supported and your system will be automatically updated over the coming weeks.

High

CVE-2026-26308

Fixes an off-by-one write that could corrupt the string null terminator.

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

For in-cluster Cloud Service Mesh, upgrade your cluster to one of the following patched versions:

• 1.28.5-asm.9
• 1.27.8-asm.7
• 1.26.8-asm.3

If you're using Cloud Service Mesh v1.25 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. Upgrade to version 1.26 or later.

For managed Cloud Service Mesh, follow the instructions in the MSA. All versions remain supported and your system will be automatically updated over the coming weeks.

Moderate

CVE-2026-26309

Fixes crash in `getAddressWithPort() when called with a scoped IPv6 address.

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

For in-cluster Cloud Service Mesh, upgrade your cluster to one of the following patched versions:

• 1.28.5-asm.9
• 1.27.8-asm.7
• 1.26.8-asm.3

If you're using Cloud Service Mesh v1.25 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. Upgrade to version 1.26 or later.

For managed Cloud Service Mesh, follow the instructions in the MSA. All versions remain supported and your system will be automatically updated over the coming weeks.

Moderate

CVE-2026-26310

Ensures decode* methods are blocked after a downstream reset.

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

For in-cluster Cloud Service Mesh, upgrade your cluster to one of the following patched versions:

• 1.28.5-asm.9
• 1.27.8-asm.7
• 1.26.8-asm.3

If you're using Cloud Service Mesh v1.25 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. Upgrade to version 1.26 or later.

For managed Cloud Service Mesh, follow the instructions in the MSA. All versions remain supported and your system will be automatically updated over the coming weeks.

Moderate

CVE-2026-26311

Fixes a bug where response phase limit may result in crash.

What should I do?

Only in-cluster Cloud Service Mesh version 1.28 is impacted by this CVE.

This CVE does not affect Cloud Service Mesh with a managed control plane.

For in-cluster Cloud Service Mesh, upgrade your cluster to one the following patched version: 1.28.5-asm.9

For managed Cloud Service Mesh, no action is required. This CVE does not affect Cloud Service Mesh with a managed control plane.

Moderate

CVE-2026-26330

Fixes JSON Web Key Set private key leakage vulnerability.

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

For in-cluster Cloud Service Mesh, upgrade your cluster to one of the following patched versions:

• 1.28.5-asm.9
• 1.27.8-asm.7
• 1.26.8-asm.3

If you're using Cloud Service Mesh v1.25 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. Upgrade to version 1.26 or later.

For managed Cloud Service Mesh, follow the instructions in the MSA. All versions remain supported and your system will be automatically updated over the coming weeks.

High

CVE-2026-31837

Fixes a bug where debug Endpoints Allow Cross-Namespace Proxy Data Access

What should I do?

Only in-cluster Cloud Service Mesh versions 1.27 and 1.28 are impacted by this CVE.

For in-cluster Cloud Service Mesh, upgrade your cluster to one of the following patched versions:

• 1.28.5-asm.9
• 1.27.8-asm.7

If you're using Cloud Service Mesh v1.25 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. Upgrade to version 1.26 or later.

For managed Cloud Service Mesh, no action is required. This CVE does not affect Cloud Service Mesh with a managed control plane.

Medium

CVE-2026-31838

TLS certificate matcher for match_typed_subject_alt_names may incorrectly treat certificates containing an embedded null byte.

What should I do?

Your cluster is impacted if it uses an in-cluster Cloud Service Mesh patch version earlier than:

• 1.27.4-asm.1
• 1.26.7-asm.1
• 1.25.6-asm.1

This CVE does not affect Cloud Service Mesh with a managed control plane.

For in-cluster Cloud Service Mesh, Upgrade your cluster to one of the following patched versions:

• 1.27.4-asm.1
• 1.26.7-asm.1
• 1.25.6-asm.1

If you're using Cloud Service Mesh v1.24 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. Upgrade to version 1.25 or later.

For managed Cloud Service Mesh, no action is required. This CVE does not affect Cloud Service Mesh with a managed control plane.

Medium

CVE-2025-66220

Envoy crashes when JWT authentication is configured with the remote JWKS fetching.

What should I do?

Your cluster is impacted if it uses an in-cluster Cloud Service Mesh patch version earlier than:

• 1.27.4-asm.1
• 1.26.7-asm.1
• 1.25.6-asm.1

Your cluster is impacted if it uses a managed Cloud Service Mesh version earlier than:

• 1.21.6-asm.7
• 1.20.8-asm.59
• 1.19.10-asm.54

For in-cluster Cloud Service Mesh, upgrade your cluster to one of the following patched versions:

• 1.27.4-asm.1
• 1.26.7-asm.1
• 1.25.6-asm.1

If you're using Cloud Service Mesh v1.24 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. Upgrade to version 1.25 or later.

For managed Cloud Service Mesh, please follow the instructions in the MSA. All versions remain supported and your system will be automatically updated over the coming weeks.

Medium

CVE-2025-64527

Potential request smuggling from early data after the CONNECT upgrade.

What should I do?

Your cluster is impacted if it uses an in-cluster Cloud Service Mesh patch version earlier than:

• 1.27.4-asm.1
• 1.26.7-asm.1
• 1.25.6-asm.1

This CVE does not affect Cloud Service Mesh with a managed control plane.

For in-cluster Cloud Service Mesh, upgrade your cluster to one of the following patched versions:

• 1.27.4-asm.1
• 1.26.7-asm.1
• 1.25.6-asm.1

If you're using Cloud Service Mesh v1.24 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. Upgrade to version 1.25 or later.

For managed Cloud Service Mesh, no action is required. This CVE does not affect Cloud Service Mesh with a managed control plane.

Medium

CVE-2025-64763

Lua filters may crash Envoy when handling a large response body.

What should I do?

Your cluster is impacted if your patch versions are earlier than:

• 1.27.2-asm.1
• 1.26.5-asm.1
• 1.25.5-asm.9

If you're using Cloud Service Mesh v1.24 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. Upgrade to version 1.25 or later.

For in-cluster Cloud Service Mesh, upgrade your cluster to one of the following patched versions:

• 1.27.2-asm.1
• 1.26.5-asm.1
• 1.25.5-asm.9

For managed Cloud Service Mesh, no action is required. All versions remain supported and your system will be automatically updated over the coming weeks.

Medium

CVE-2025-62504

Large requests or responses may crash the TCP connection pool.

What should I do?

Your cluster is impacted if your patch versions are earlier than:

• 1.27.2-asm.1
• 1.26.5-asm.1
• 1.25.5-asm.9

If you're using Cloud Service Mesh v1.24 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. Upgrade to version 1.25 or later.

For in-cluster Cloud Service Mesh, upgrade your cluster to one of the following patched versions:

• 1.27.2-asm.1
• 1.26.5-asm.1
• 1.25.5-asm.9

For managed Cloud Service Mesh, no action is required. All versions remain supported and your system will be automatically updated over the coming weeks.

Medium

CVE-2025-62409

Use after free in DNS cache.

What should I do?

Only clusters running in-cluster Cloud Service Mesh version 1.26 are affected.

If you are running a managed Cloud Service Mesh, you are not affected and do not need to take any action.

If you are running in-cluster Cloud Service Mesh 1.26, upgrade any affected clusters to 1.26.4-asm.1.

High

CVE-2025-54588

HTTP/1: Sending overload crashes when the request is reset beforehand.

What should I do?

Your cluster is impacted if patch versions earlier than:

• 1.23.4-asm.1
• 1.22.7-asm.1
• 1.21.5-asm.17
• 1.20.8-asm.14
• 1.19.10-asm.24

For in-cluster Cloud Service Mesh, Upgrade your cluster to one of the following patched versions:

• 1.23.4-asm.1
• 1.22.7-asm.1
• 1.21.5-asm.17

If you're using Cloud Service Mesh v1.20 or earlier, your release has reached end of life and is no longer supported. If you're using Cloud Service Mesh v1.20 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to version 1.21 or later.

For managed Cloud Service Mesh, no action is required. All versions remain supported and your system will be automatically updated over the coming weeks.

High

CVE-2024-53270

HTTP/1.1 Multiple issues with envoy.reloadable_features.http1_balsa_delay_reset.

What should I do?

Your cluster is impacted if patch versions earlier than:

• 1.23.4-asm.1

For in-cluster Cloud Service Mesh, Upgrade your cluster to one of the following patched versions:

• 1.23.4-asm.1

If you're using Cloud Service Mesh v1.20 or earlier, your release has reached end of life and is no longer supported. If you're using Cloud Service Mesh v1.20 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to version 1.21 or later.

For managed Cloud Service Mesh, no action is required. All versions remain supported and your system will be automatically updated over the coming weeks.

High

CVE-2024-53271

oghttp2 crash on OnBeginHeadersForStream

What should I do?

Only clusters running Cloud Service Mesh v1.23 are affected

Cloud Service Mesh 1.23.2-asm.2 contains the fix for this issue. No action is required.

High

CVE-2024-45807

Malicious log injection via access logs

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

Upgrade your cluster to one of the following patched versions:

• 1.20.8-asm.7
• 1.21.5-asm.7
• 1.22.5-asm.1
• 1.23.2-asm.2

Medium

CVE-2024-45808

Potential to manipulate `x-envoy` headers from external sources

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

Upgrade your cluster to one of the following patched versions:

• 1.20.8-asm.7
• 1.21.5-asm.7
• 1.22.5-asm.1
• 1.23.2-asm.2

Medium

CVE-2024-45806

JWT filter crash in the clear route cache with remote JWKs

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

Upgrade your cluster to one of the following patched versions:

• 1.20.8-asm.7
• 1.21.5-asm.7
• 1.22.5-asm.1
• 1.23.2-asm.2

Medium

CVE-2024-45809

Envoy crashes for LocalReply in http async client

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

Upgrade your cluster to one of the following patched versions:

• 1.20.8-asm.7
• 1.21.5-asm.7
• 1.22.5-asm.1
• 1.23.2-asm.2

Medium

CVE-2024-45810

Envoy incorrectly accepts HTTP 200 response for entering upgrade mode.

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

If you are running managed Cloud Service Mesh, your system will be automatically updated over the coming days.

Otherwise, upgrade your cluster to one of the following patched versions:

• v1.21.3-asm.3
• v1.20.7-asm.2
• v1.19.10-asm.6
• v1.18.7-asm.26
• If you're using Cloud Service Mesh v1.17 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.18 or above.

Medium

CVE-2024-23326

Crash in EnvoyQuicServerStream::OnInitialHeadersComplete().

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

If you are running managed Cloud Service Mesh, your system will be automatically updated over the coming days.

Otherwise, upgrade your cluster to one of the following patched versions:

• v1.21.3-asm.3
• v1.20.7-asm.2
• v1.19.10-asm.6
• v1.18.7-asm.26
• If you're using Cloud Service Mesh v1.17 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.18 or above.

Medium

CVE-2024-32974

Crash in QuicheDataReader::PeekVarInt62Length().

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

If you are running managed Cloud Service Mesh, your system will be automatically updated over the coming days.

Otherwise, upgrade your cluster to one of the following patched versions:

• v1.21.3-asm.3
• v1.20.7-asm.2
• v1.19.10-asm.6
• v1.18.7-asm.26
• If you're using Cloud Service Mesh v1.17 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.18 or above.

Medium

CVE-2024-32975

Endless loop while decompressing Brotli data with extra input.

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

If you are running managed Cloud Service Mesh, your system will be automatically updated over the coming days.

Otherwise, upgrade your cluster to one of the following patched versions:

• v1.21.3-asm.3
• v1.20.7-asm.2
• v1.19.10-asm.6
• v1.18.7-asm.26
• If you're using Cloud Service Mesh v1.17 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.18 or above.

High

CVE-2024-32976

Crash (use-after-free) in EnvoyQuicServerStream.

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

If you are running managed Cloud Service Mesh, your system will be automatically updated over the coming days.

Otherwise, upgrade your cluster to one of the following patched versions:

• v1.21.3-asm.3
• v1.20.7-asm.2
• v1.19.10-asm.6
• v1.18.7-asm.26
• If you're using Cloud Service Mesh v1.17 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.18 or above.

Medium

CVE-2024-34362

Crash due to uncaught nlohmann JSON exception.

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

If you are running managed Cloud Service Mesh, your system will be automatically updated over the coming days.

Otherwise, upgrade your cluster to one of the following patched versions:

• v1.21.3-asm.3
• v1.20.7-asm.2
• v1.19.10-asm.6
• v1.18.7-asm.26
• If you're using Cloud Service Mesh v1.17 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.18 or above.

High

CVE-2024-34363

Envoy OOM vector from HTTP async client with unbounded response buffer for mirror response.

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

If you are running managed Cloud Service Mesh, your system will be automatically updated over the coming days.

Otherwise, upgrade your cluster to one of the following patched versions:

• v1.21.3-asm.3
• v1.20.7-asm.2
• v1.19.10-asm.6
• v1.18.7-asm.26
• If you're using Cloud Service Mesh v1.17 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.18 or above.

Medium

CVE-2024-34364

HTTP/2: memory exhaustion due to CONTINUATION frame flood.

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

If you are running managed Cloud Service Mesh, no action is required. Your system will be automatically updated over the coming days.

If you are running in-cluster Cloud Service Mesh, you must upgrade your cluster to one of the following patched versions:

• 1.20.6-asm.0
• 1.19.10-asm.0
• 1.18.7-asm.21

If you're using Cloud Service Mesh v1.17 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh v1.18 or later.

High

CVE-2024-27919

HTTP/2: CPU exhaustion due to CONTINUATION frame flood

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

If you are running managed Cloud Service Mesh, no action is required. Your system will be automatically updated over the coming days.

If you are running in-cluster Cloud Service Mesh, you must upgrade your cluster to one of the following patched versions:

• 1.20.6-asm.0
• 1.19.10-asm.0
• 1.18.7-asm.21

If you're using Cloud Service Mesh v1.17 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.18 or later.

Medium

CVE-2024-30255

Abnormal termination when using auto_sni with ':authority' header longer than 255 characters.

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

If you are running managed Cloud Service Mesh, no action is required. Your system will be automatically updated over the coming days.

If you are running in-cluster Cloud Service Mesh, you must upgrade your cluster to one of the following patched versions:

• 1.20.6-asm.0
• 1.19.10-asm.0
• 1.18.7-asm.21

If you're using Cloud Service Mesh v1.17 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.18 or above.

High

CVE-2024-32475

HTTP/2 CONTINUATION frames can be utilized for DoS attacks.

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

If you are running managed Cloud Service Mesh, no action is required. Your system will be automatically updated over the coming days.

If you are running in-cluster Cloud Service Mesh, you must upgrade your cluster to one of the following patched versions:

• 1.20.6-asm.0
• 1.19.10-asm.0
• 1.18.7-asm.21

If you're using Cloud Service Mesh v1.17 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to version v1.18 or later.

Not Provided

CVE-2023-45288

Envoy crashes when idle and requests per try timeout occur within the backoff interval.

What should I do?

If you are running managed Cloud Service Mesh, no action is required. Your system will be automatically updated over the coming days.

If you are running in-cluster Cloud Service Mesh, you must upgrade your cluster to one of the following patched versions:

• 1.20.3-asm.4
• 1.19.7-asm.3
• 1.18.7-asm.4
• 1.17.8-asm.20

If you're using Anthos Service Mesh v1.17 or earlier, your release has reached end of life and is no longer supported. While these CVE fixes have been backported to 1.17, you should upgrade to 1.18 or later.

High

CVE-2024-23322

Excessive CPU usage when URI template matcher is configured using regex.

What should I do?

If you are running managed Cloud Service Mesh, no action is required. Your system will be automatically updated over the coming days.

If you are running in-cluster Cloud Service Mesh, you must upgrade your cluster to one of the following patched versions:

• 1.20.3-asm.4
• 1.19.7-asm.3
• 1.18.7-asm.4
• 1.17.8-asm.20

If you're using Anthos Service Mesh v1.17 or earlier, your release has reached end of life and is no longer supported. While these CVE fixes have been backported to 1.17, you should upgrade to 1.18 or later.

Medium

CVE-2024-23323

External authorization can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata.

What should I do?

If you are running managed Cloud Service Mesh, no action is required. Your system will be automatically updated over the coming days.

If you are running in-cluster Cloud Service Mesh, you must upgrade your cluster to one of the following patched versions:

• 1.20.3-asm.4
• 1.19.7-asm.3
• 1.18.7-asm.4
• 1.17.8-asm.20

If you're using Anthos Service Mesh v1.17 or earlier, your release has reached end of life and is no longer supported. While these CVE fixes have been backported to 1.17, you should upgrade to 1.18 or later.

High

CVE-2024-23324

Envoy crashes when using an address type that isn't supported by the OS.

What should I do?

If you are running managed Cloud Service Mesh, no action is required. Your system will be automatically updated over the coming days.

If you are running in-cluster Cloud Service Mesh, you must upgrade your cluster to one of the following patched versions:

• 1.20.3-asm.4
• 1.19.7-asm.3
• 1.18.7-asm.4
• 1.17.8-asm.20

If you're using Anthos Service Mesh v1.17 or earlier, your release has reached end of life and is no longer supported. While these CVE fixes have been backported to 1.17, you should upgrade to 1.18 or later.

High

CVE-2024-23325

Crash in proxy protocol when command type is LOCAL.

What should I do?

If you are running managed Cloud Service Mesh, no action is required. Your system will be automatically updated over the coming days.

If you are running in-cluster Cloud Service Mesh, you must upgrade your cluster to one of the following patched versions:

• 1.20.3-asm.4
• 1.19.7-asm.3
• 1.18.7-asm.4
• 1.17.8-asm.20

If you're using Anthos Service Mesh v1.17 or earlier, your release has reached end of life and is no longer supported. While these CVE fixes have been backported to 1.17, you should upgrade to 1.18 or later.

High

CVE-2024-23327

A denial of service attack can affect the data plane when using the HTTP/2 protocol.

What should I do?

Your cluster is impacted if it uses Cloud Service Mesh patch versions earlier than 1.18.4, 1.17.7, or 1.16.7.

Upgrade your cluster to one of the following patched versions:

• 1.18.4-asm.0
• 1.17.7-asm.0
• 1.16.7-asm.10

If you are running managed Cloud Service Mesh, your system will be automatically updated within the next few days.

If you're using Cloud Service Mesh v1.15 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to v1.16 or above.

High

CVE-2023-44487

A malicious client is able to construct credentials with permanent validity in some specific scenarios. For example, the combination of host and expiration time in the HMAC payload can be always valid in OAuth2 filter's HMAC check.

What should I do?

Your cluster is impacted if it uses Cloud Service Mesh patch versions earlier than

• 1.17.4
• 1.16.6
• 1.15.7

Upgrade your cluster to one of the following patched versions:

• 1.17.5-asm.0
• 1.16.7-asm.0
• 1.15.7-asm.23

If you are running managed Cloud Service Mesh, your system will be automatically updated within the next few days.

If you're using Anthos Service Mesh 1.14 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to ASM 1.15 or above.

High

CVE-2023-35941

gRPC access loggers using the listener's global scope can cause a use-after-free crash when the listener is drained. This can be triggered by an LDS update with the same gRPC access log configuration.

What should I do?

Your cluster is impacted if it uses Cloud Service Mesh patch versions earlier than

• 1.17.4
• 1.16.6
• 1.15.7

Upgrade your cluster to one of the following patched versions:

• 1.17.5-asm.0
• 1.16.7-asm.0
• 1.15.7-asm.23

If you are running managed Cloud Service Mesh, your system will be automatically updated within the next few days.

If you're using Anthos Service Mesh 1.14 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to ASM 1.15 or above.

Medium

CVE-2023-35942

If origin header is configured to be removed with request_headers_to_remove: origin, CORS filter will segfault and crash Envoy.

What should I do?

Your cluster is impacted if it uses Cloud Service Mesh patch versions earlier than

• 1.17.4
• 1.16.6
• 1.15.7

Upgrade your cluster to one of the following patched versions:

• 1.17.5-asm.0
• 1.16.7-asm.0
• 1.15.7-asm.23

If you are running managed Cloud Service Mesh, your system will be automatically updated within the next few days.

If you're using Anthos Service Mesh 1.14 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to ASM 1.15 or above.

Medium

CVE-2023-35943

Attackers can send mixed scheme requests to bypass some scheme checks in Envoy. For example, if a request with mixed scheme htTp is sent to the OAuth2 filter, it will fail the exact-match checks for http, and inform the remote endpoint the scheme is https, thus potentially bypassing OAuth2 checks specific to HTTP requests.

What should I do?

Your cluster is impacted if it uses Cloud Service Mesh patch versions earlier than

• 1.17.4
• 1.16.6
• 1.15.7

Upgrade your cluster to one of the following patched versions:

• 1.17.5-asm.0
• 1.16.7-asm.0
• 1.15.7-asm.23

If you are running managed Cloud Service Mesh, your system will be automatically updated within the next few days.

If you're using Anthos Service Mesh 1.14 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to ASM 1.15 or above.

High

CVE-2023-35944

The attacker can use this vulnerability to bypass auth checks when ext_authz is used.

What should I do?

Your clusters are impacted if they use Cloud Service Mesh patch versions earlier than:

• 1.16.4
• 1.15.7
• 1.14.6

Upgrade your cluster to one of the following patched versions:

• 1.16.4-asm.2
• 1.15.7-asm.1
• 1.14.6-asm.11

If you're using Cloud Service Mesh v1.13 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh} 1.14 or above.

Medium

CVE-2023-27488

Envoy configuration must also include an option to add request headers that were generated using inputs from the request, i.e. the peer certificate SAN.

What should I do?

Your clusters are impacted if they use Cloud Service Mesh patch versions earlier than:

• 1.16.4
• 1.15.7
• 1.14.6

Upgrade your cluster to one of the following patched versions:

• 1.16.4-asm.2
• 1.15.7-asm.1
• 1.14.6-asm.11

If you're using Cloud Service Mesh v1.13 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.14 or above.

High

CVE-2023-27493

Attackers can send large request bodies for routes that have Lua filter enabled and trigger crashes.

What should I do?

Your clusters are impacted if they use Cloud Service Mesh patch versions earlier than:

• 1.16.4
• 1.15.7
• 1.14.6

Upgrade your cluster to one of the following patched versions:

• 1.16.4-asm.2
• 1.15.7-asm.1
• 1.14.6-asm.11

If you're using Cloud Service Mesh v1.13 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.14 or above.

Medium

CVE-2023-27492

Attackers can send specifically crafted HTTP/2 or HTTP/3 requests to trigger parsing errors on HTTP/1 upstream service.

What should I do?

Your clusters are impacted if they use Cloud Service Mesh patch versions earlier than:

• 1.16.4
• 1.15.7
• 1.14.6

Upgrade your cluster to one of the following patched versions:

• 1.16.4-asm.2
• 1.15.7-asm.1
• 1.14.6-asm.11

If you're using Cloud Service Mesh v1.13 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.14 or above.

Medium

CVE-2023-27491

The header x-envoy-original-path should be an internal header, but Envoy does not remove this header from the request at the beginning of request processing when it is sent from an untrusted client.

What should I do?

Your clusters are impacted if they use Cloud Service Mesh patch versions earlier than:

• 1.16.4
• 1.15.7
• 1.14.6

Upgrade your cluster to one of the following patched versions:

• 1.16.4-asm.2
• 1.15.7-asm.1
• 1.14.6-asm.11

If you're using Cloud Service Mesh v1.13 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.14 or above.

High

CVE-2023-27487

The Istio control plane istiod is vulnerable to a request processing error, allowing a malicious attacker that sends a specially crafted message which results in the control plane crashing when the validating webhook for a cluster is exposed publicly. This endpoint is served over TLS port 15017, but does not require any authentication from the attacker.

What should I do?

Your cluster is impacted if it uses Cloud Service Mesh patch versions earlier than 1.14.4, 1.13.8, or 1.12.9.

If you are running standalone Cloud Service Mesh, upgrade your cluster to one of the following patched versions:

• If you're using Anthos Service Mesh 1.14, upgrade to v1.14.4-asm.2
• If you're using Anthos Service Mesh 1.13, upgrade to v1.13.8-asm.4
• If you're using Anthos Service Mesh 1.12, upgrade to v1.12.9-asm.3

If you are running managed Cloud Service Mesh, your system will be automatically updated within the next few days.

If you're using Cloud Service Mesh v1.11 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.12 or later.

High

CVE-2022-39278

Istio data plane can potentially access memory unsafely when the Metadata Exchange and Stats extensions are enabled.

What should I do?

Your cluster is impacted if it uses Cloud Service Mesh patch versions earlier than 1.13.4-asm.4, 1.12.7-asm.2, or 1.11.8-asm.4.

Upgrade your cluster to one of the following patched versions:

• 1.13.4-asm.4
• 1.12.7-asm.2
• 1.11.8-asm.4

If you're using Cloud Service Mesh v1.10 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.11 or later. For more information, see Upgrading from earlier versions (GKE or Upgrading from earlier versions (on-premises).

High

CVE-2022-31045

Data can exceed intermediate buffer limits if a malicious attacker passes a small highly compressed payload (also known as a zip bomb attack).

What should I do?

Your cluster is impacted if it uses Cloud Service Mesh patch versions earlier than 1.13.4-asm.4, 1.12.7-asm.2, or 1.11.8-asm.4.

Although Cloud Service Mesh does not support Envoy filters, you could be impacted if you use a decompress filter.

Upgrade your cluster to one of the following patched versions:

• 1.13.4-asm.4
• 1.12.7-asm.2
• 1.11.8-asm.4

If you're using Cloud Service Mesh v1.10 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.11 or later. For more information, see Upgrading from earlier versions (GKE or Upgrading from earlier versions (on-premises).

Envoy users managing their own Envoys should ensure that they are using Envoy release 1.22.1. Envoy users managing their own Envoys build the binaries from a source like GitHub and deploy them.

There's no action to be taken by users who run managed Envoys (Google Cloud provides the Envoy binaries), for which cloud products will switch to 1.22.1.

High

CVE-2022-29225

Potential null pointer dereference in GrpcHealthCheckerImpl.

What should I do?

Your cluster is impacted if it uses Cloud Service Mesh patch versions earlier than 1.13.4-asm.4, 1.12.7-asm.2, or 1.11.8-asm.4.

Upgrade your cluster to one of the following patched versions:

• 1.13.4-asm.4
• 1.12.7-asm.2
• 1.11.8-asm.4

If you're using Cloud Service Mesh v1.10 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.11 or later. For more information, see Upgrading from earlier versions (GKE or Upgrading from earlier versions (on-premises).

Envoy users managing their own Envoys should ensure that they are using Envoy release 1.22.1. Envoy users managing their own Envoys build the binaries from a source like GitHub and deploy them.

There's no action to be taken by users who run managed Envoys (Google Cloud provides the Envoy binaries), for which cloud products will switch to 1.22.1.

Medium

CVE-2021-29224

OAuth filter allows trivial bypass.

What should I do?

Your cluster is impacted if it uses Cloud Service Mesh patch versions earlier than 1.13.4-asm.4, 1.12.7-asm.2, or 1.11.8-asm.4.

Although Cloud Service Mesh does not support Envoy filters, you could be impacted if you use an OAuth filter.

Upgrade your cluster to one of the following patched versions:

• 1.13.4-asm.4
• 1.12.7-asm.2
• 1.11.8-asm.4

If you're using Cloud Service Mesh v1.10 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.11 or later. For more information, see Upgrading from earlier versions (GKE or Upgrading from earlier versions (on-premises).

Envoy users managing their own Envoys also use the OAuth filter should ensure that they are using Envoy release 1.22.1. Envoy users managing their own Envoys build the binaries from a source like GitHub and deploy them.

There's no action to be taken by users who run managed Envoys (Google Cloud provides the Envoy binaries), for which cloud products will switch to 1.22.1.

Critical

CVE-2021-29226

OAuth filter can corrupt memory (earlier versions) or trigger an ASSERT() (later versions).

What should I do?

Your cluster is impacted if it uses Cloud Service Mesh patch versions earlier than 1.13.4-asm.4, 1.12.7-asm.2, or 1.11.8-asm.4.

Although Cloud Service Mesh does not support Envoy filters, you could be impacted if you use an OAuth filter.

Upgrade your cluster to one of the following patched versions:

• 1.13.4-asm.4
• 1.12.7-asm.2
• 1.11.8-asm.4

If you're using Cloud Service Mesh v1.10 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.11 or later.

Envoy users managing their own Envoys also use the OAuth filter should ensure that they are using Envoy release 1.22.1. Envoy users managing their own Envoys build the binaries from a source like GitHub and deploy them.

There's no action to be taken by users who run managed Envoys (Google Cloud provides the Envoy binaries), for which cloud products will switch to 1.22.1.

High

CVE-2022-29228

Internal redirects crash for requests with body or trailers.

What should I do?

Your cluster is impacted if it uses Cloud Service Mesh patch versions earlier than 1.13.4-asm.4, 1.12.7-asm.2, or 1.11.8-asm.4.

Upgrade your cluster to one of the following patched versions:

• 1.13.4-asm.4
• 1.12.7-asm.2
• 1.11.8-asm.4

If you're using Cloud Service Mesh v1.10 or earlier, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.11 or later. For more information, see Upgrading from earlier versions (GKE or Upgrading from earlier versions (on-premises).

Envoy users managing their own Envoys should ensure that they are using Envoy release 1.22.1. Envoy users managing their own Envoys build the binaries from a source like GitHub and deploy them.

There's no action to be taken by users who run managed Envoys (Google Cloud provides the Envoy binaries), for which cloud products will switch to 1.22.1.

High

CVE-2022-29227

The Istio control plane, istiod, is vulnerable to a request processing error, allowing a malicious attacker that sends a specially crafted message which results in the control plane crashing when the validating webhook for a cluster is exposed publicly. This endpoint is served over TLS port 15017 but does not require any authentication from the attacker.

What should I do?

All Cloud Service Mesh versions are impacted by this CVE.

Note: If you are using Managed Control Plane, this vulnerability has already been fixed and you are not impacted.

Upgrade your cluster to one of the following patched versions:

• 1.12.5-asm.0
• 1.11.8-asm.0
• 1.10.6-asm.2

If you're using Cloud Service Mesh v1.9 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.10 or above.

High

CVE-2022-24726

Istiod crashes upon receiving requests with a specially crafted authorization header.

What should I do?

Your cluster is impacted if both of the following are true:

• It uses Cloud Service Mesh patch versions earlier than 1.12.4-asm.1, 1.11.7-asm.1, or 1.10.6-asm.1.

Note: If you are using Managed Control Plane, this vulnerability has already been fixed and you are not impacted.

Upgrade your cluster to one of the following patched versions:

• 1.12.4-asm.1
• 1.11.7-asm.1
• 1.10.6-asm.1

If you're using Cloud Service Mesh v1.9 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.10 or above.

High

CVE-2022-23635

Potential null pointer dereference when using JWT filter safe_regex match.

What should I do?

Your cluster is impacted if both of the following are true:

• It uses Cloud Service Mesh patch versions earlier than 1.12.4-asm.1, 1.11.7-asm.1, or 1.10.6-asm.1.
• Although Cloud Service Mesh do not support Envoy filters, you could be impacted if you use JWT filter regex.

Upgrade your cluster to one of the following patched versions:

• 1.12.4-asm.1
• 1.11.7-asm.1
• 1.10.6-asm.1

If you're using Cloud Service Mesh v1.9 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.10 or above.

Medium

CVE-2021-43824

Use-after-free when response filters increase response data, and increased data exceeds downstream buffer limits.

What should I do?

Your cluster is impacted if both of the following are true:

• It uses Cloud Service Mesh patch versions earlier than 1.12.4-asm.1, 1.11.7-asm.1, or 1.10.6-asm.1.
• Although Cloud Service Mesh do not support Envoy filters, you could be impacted if you use a decompress filter.

Upgrade your cluster to one of the following patched versions:

• 1.12.4-asm.1
• 1.11.7-asm.1
• 1.10.6-asm.1

If you're using Cloud Service Mesh v1.9 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.10 or above.

Medium

CVE-2021-43825

Use-after-free when tunneling TCP over HTTP, if downstream disconnects during upstream connection establishment.

What should I do?

Your cluster is impacted if both of the following are true:

• It uses Cloud Service Mesh patch versions earlier than 1.12.4-asm.1, 1.11.7-asm.1, or 1.10.6-asm.1.
• Although Cloud Service Mesh do not support Envoy filters, you could be impacted if you use a tunneling filter.

Upgrade your cluster to one of the following patched versions:

• 1.12.4-asm.1
• 1.11.7-asm.1
• 1.10.6-asm.1

If you're using Cloud Service Mesh v1.9 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.10 or above.

Medium

CVE-2021-43826

Incorrect configuration handling allows mTLS session re-use without re-validation after validation settings have changed.

What should I do?

Your cluster is impacted if both of the following are true:

• It uses Cloud Service Mesh patch versions earlier than 1.12.4-asm.1, 1.11.7-asm.1, or 1.10.6-asm.1.
• All Cloud Service Mesh services using mTLS are impacted by this CVE.

Upgrade your cluster to one of the following patched versions:

• 1.12.4-asm.1
• 1.11.7-asm.1
• 1.10.6-asm.1

If you're using Cloud Service Mesh v1.9 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.10 or above.

High

CVE-2022-21654

Incorrect handling of internal redirects to routes with a direct response entry.

What should I do?

Your cluster is impacted if both of the following are true:

• It uses Cloud Service Mesh patch versions earlier than 1.12.4-asm.1, 1.11.7-asm.1, or 1.10.6-asm.1.
• Although Cloud Service Mesh do not support Envoy filters, you could be impacted if you use a direct response filter.

Upgrade your cluster to one of the following patched versions:

• 1.12.4-asm.1
• 1.11.7-asm.1
• 1.10.6-asm.1

If you're using Cloud Service Mesh v1.9 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.10 or above.

High

CVE-2022-21655

Stack exhaustion when a cluster is deleted via Cluster Discovery Service.

What should I do?

Your cluster is impacted if both of the following are true:

• It uses Cloud Service Mesh patch versions earlier than 1.12.4-asm.1 or 1.11.7-asm.1.

Upgrade your cluster to one of the following patched versions:

• 1.12.4-asm.1
• 1.11.7-asm.1

If you're using Cloud Service Mesh v1.9 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to Cloud Service Mesh 1.10 or above.

Medium

CVE-2022-23606

Istio contains a remotely exploitable vulnerability where an HTTP request with a fragment (a section in the end of a URI that begins with a # character) in the URI path could bypass Istio’s URI path-based authorization policies.

For example, an Istio authorization policy denies requests sent to the URI path /user/profile. In the vulnerable versions, a request with the URI path /user/profile#section1 bypasses the deny policy and routes to the backend (with the normalized URI path /user/profile%23section1), which leads to a security incident.

This fix depends on a fix in Envoy, which is associated with CVE-2021-32779.

What should I do?

Your cluster is impacted if both of the following are true:

• It uses Cloud Service Mesh patch versions earlier than 1.7.8-asm.10, 1.8.6-asm.8, 1.9.8-asm.1, and 1.10.4-asm.6.
• It uses authorization policies with DENY actions and operation.paths, or ALLOW actions and operation.notPaths.

Upgrade your cluster to one of the following patched versions:

• 1.10.4-asm.6
• 1.9.8-asm.1
• 1.8.6-asm.8
• 1.7.8-asm.10

With the new versions, the fragment part of the request’s URI is removed before the authorization and routing. This prevents a request with a fragment in its URI from bypassing authorization policies which are based on the URI without the fragment part.

If you opt-out of this new behavior, the fragment section in the URI is kept. To opt-out, you can configure your installation as follows:

apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
metadata:
  name: opt-out-fragment-cve-fix
  namespace: istio-system
spec:
  meshConfig:
    defaultConfig:
      proxyMetadata:
        HTTP_STRIP_FRAGMENT_FROM_PATH_UNSAFE_IF_DISABLED: "false"

Note: Opting out of this behavior makes your cluster vulnerable to this CVE.

High

CVE-2021-39156

Istio contains a remotely exploitable vulnerability where an HTTP request could potentially bypass an Istio authorization policy when using rules based on hosts or notHosts.

In the vulnerable versions, the Istio authorization policy compares the HTTP Host or :authority headers in a case-sensitive manner, which is inconsistent with RFC 4343. For example, the user could have an authorization policy that rejects requests with host secret.com, but the attacker can bypass this by sending the request at hostname Secret.com. The routing flow routes the traffic to the backend for secret.com, which causes a security incident.

What should I do?

Your cluster is impacted if both of the following are true:

• It uses Cloud Service Mesh patch versions earlier than 1.7.8-asm.10, 1.8.6-asm.8, 1.9.8-asm.1, and 1.10.4-asm.6.
• It uses authorization policies with DENY actions based on operation.hosts or ALLOW actions based on operation.notHosts.

Upgrade your cluster to one of the following patched versions:

• 1.10.4-asm.6
• 1.9.8-asm.1
• 1.8.6-asm.8
• 1.7.8-asm.10

This mitigation makes sure that the HTTP Host or :authority headers are evaluated against the hosts or notHosts specs in the authorization policies in a case-insensitive manner.

High

CVE-2021-39155

Envoy contains a remotely exploitable vulnerability that an HTTP request with multiple value headers could do an incomplete authorization policy check when the ext_authz extension is used. When a request header contains multiple values, the external authorization server will only see the last value of the given header.

What should I do?

Your cluster is impacted if both of the following are true:

• It uses Cloud Service Mesh patch versions earlier than 1.7.8-asm.10, 1.8.6-asm.8, 1.9.8-asm.1, and 1.10.4-asm.6.
• It uses the External Authorization feature.

Upgrade your cluster to one of the following patched versions:

• 1.10.4-asm.6
• 1.9.8-asm.1
• 1.8.6-asm.8
• 1.7.8-asm.10

High

CVE-2021-32777

Envoy contains a remotely exploitable vulnerability that affects Envoy's decompressor, json-transcoder, or grpc-web extensions or proprietary extensions that modify and increase the size of request or response bodies. Modifying and increasing the size of the body in an Envoy’s extension beyond the internal buffer size could lead to Envoy accessing deallocated memory and terminating abnormally.

What should I do?

Your cluster is impacted if both of the following are true:

• It uses Cloud Service Mesh patch versions earlier than 1.7.8-asm.10, 1.8.6-asm.8, 1.9.8-asm.1, and 1.10.4-asm.6.
• It uses EnvoyFilters.

Upgrade your cluster to one of the following patched versions:

• 1.10.4-asm.6
• 1.9.8-asm.1
• 1.8.6-asm.8
• 1.7.8-asm.10

High

CVE-2021-32781

Envoy contains a remotely exploitable vulnerability where an Envoy client opening and then resetting a large number of HTTP/2 requests could lead to excessive CPU consumption.

What should I do?

Your cluster is impacted if it uses Cloud Service Mesh patch versions earlier than 1.7.8-asm.10, 1.8.6-asm.8, 1.9.8-asm.1, and 1.10.4-asm.6.

Upgrade your cluster to one of the following patched versions:

• 1.10.4-asm.6
• 1.9.8-asm.1

Note: If you are using Cloud Service Mesh 1.8 or earlier, please upgrade to the latest patch versions of Cloud Service Mesh 1.9 and above to mitigate this vulnerability.

High

CVE-2021-32778

Envoy contains a remotely exploitable vulnerability where an untrusted upstream service could cause Envoy to terminate abnormally by sending the GOAWAY frame followed by the SETTINGS frame with the SETTINGS_MAX_CONCURRENT_STREAMS parameter set to 0.

What should I do?

Your cluster is impacted if it uses Cloud Service Mesh 1.10 with a patch version earlier than 1.10.4-asm.6.

Upgrade your cluster to the following patch version:

• 1.10.4-asm.6

High

CVE-2021-32780

The Istio secure Gateway or workloads using the DestinationRule can load TLS private keys and certificates from Kubernetes secrets via the credentialName configuration. From Istio 1.8 and above, the secrets are read from istiod and conveyed to gateways and workloads via XDS.

Normally, a gateway or workload deployment is only able to access TLS certificates and private keys stored in the secret within its namespace. However, a bug in istiod allows a client authorized to access the Istio XDS API to retrieve any TLS certificate and private keys cached in istiod. This security vulnerability only impacts the 1.8 and 1.9 minor releases of Cloud Service Mesh.

What should I do?

Your cluster is impacted if ALL of the following conditions are true:

• It is using a 1.9.x version prior to 1.9.6-asm.1 or a 1.8.x prior to 1.8.6-asm.4.
• It has defined Gateways or DestinationRules with the credentialName field specified.
• It does not specify the istiod flag PILOT_ENABLE_XDS_CACHE=false.

Upgrade your cluster to one of the following patched versions:

• 1.9.6-asm.1
• 1.8.6-asm.4

High

CVE-2021-34824

Istio contains a remotely exploitable vulnerability where an external client can access unexpected services in the cluster, bypassing authorization checks, when a gateway is configured with AUTO_PASSTHROUGH routing configuration.

What should I do?

This vulnerability impacts only usage of the AUTO_PASSTHROUGH Gateway type, which is typically only used in multi-network, multi-cluster deployments.

Detect the TLS mode of all Gateways in the cluster with the following command:

kubectl get gateways.networking.istio.io -A -o \
  "custom-columns=NAMESPACE:.metadata.namespace, \
  NAME:.metadata.name,TLS_MODE:.spec.servers[*].tls.mode"

If the output shows any AUTO_PASSTHROUGH Gateways, you could be impacted.

Update your clusters to the latest Cloud Service Mesh versions:

• 1.9.5-asm.2
• 1.8.6-asm.3
• 1.7.8-asm.8

* Note: The rollout of the Cloud Service Mesh Managed Control Plane (available only in 1.9.x versions) will complete in the next few days.

High

CVE-2021-31921

Istio contains a remotely exploitable vulnerability where an HTTP request path with multiple slashes or escaped slash characters (%2F or %5C) could potentially bypass an Istio authorization policy when path based authorization rules are used.

In a scenario where an Istio cluster administrator defines an authorization DENY policy to reject the request at path "/admin", a request sent to the URL path "//admin" will NOT be rejected by the authorization policy.

According to the RFC 3986, the path "//admin" with multiple slashes should technically be treated as a different path from the "/admin". However, some backend services choose to normalize the URL paths by merging multiple slashes to a single slash. This can result in a bypass of the authorization policy ("//admin" does not match "/admin"), and a user can access the resource at path "/admin" in the backend.

What should I do?

Your cluster is impacted by this vulnerability if you have authorization policies using "ALLOW action + notPaths field" or "DENY action + paths field" patterns. These patterns are vulnerable to unexpected policy bypasses and you should upgrade to fix the security issue ASAP.

The following is an example of vulnerable policy that uses "DENY action + paths field" pattern:

apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: deny-path-admin
spec:
  action: DENY
  rules:
  - to:
    - operation:
        paths: ["/admin"]

The following is another example of vulnerable policy that uses "ALLOW action + notPaths field" pattern:

apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-path-not-admin
spec:
  action: ALLOW
  rules:
  - to:
    - operation:
        notPaths: ["/admin"]

Your cluster is not impacted by this vulnerability if:

• You don't have authorization policies.
• Your authorization policies don't define paths or notPaths fields.
• Your authorization policies use "ALLOW action + paths field" or "DENY action + notPaths field" patterns. These patterns could only cause unexpected rejection instead of policy bypasses.

Upgrading is optional for these cases.

Update your clusters to the latest supported Cloud Service Mesh versions*. These versions support configuring the Envoy proxies in the system with more normalization options:

• 1.9.5-asm.2
• 1.8.6-asm.3
• 1.7.8-asm.8

* Note: The rollout of the Cloud Service Mesh Managed Control Plane (available only in 1.9.x versions) will complete in the next few days.

Follow the Istio security best practices guide to configure your authorization policies.

High

CVE-2021-31920

The Envoy and Istio projects recently announced several new security vulnerabilities (CVE-2021-28682, CVE-2021-28683, and CVE-2021-29258), that could allow an attacker to crash Envoy and potentially render parts of the cluster offline and unreachable.

This impacts delivered services such as Cloud Service Mesh.

What should I do?

To fix these vulnerabilities, upgrade your Cloud Service Mesh bundle to one of the following patched versions:

• 1.9.3-asm.2
• 1.8.5-asm.2
• 1.7.8-asm.1
• 1.6.14-asm.2

For more information, see the Cloud Service Mesh release notes.

High

CVE-2021-28682
CVE-2021-28683
CVE-2021-29258