CVE-2023-35942

Envoy's gRPC access log crash caused by the listener draining

MEDIUM

6.5

CVSS Score

Published: July 25, 2023 at 06:24 PM UTC

Updated: June 17, 2026 at 06:05 AM UTC

1 product affected across 1 vendorEnvoy

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.9%

SSVC

PoC

Description

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, gRPC access loggers using listener's global scope can cause a `use-after-free` crash when the listener is drained. Versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12 have a fix for this issue. As a workaround, disable gRPC access log or stop listener update.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Envoy · Envoyproxy

95%

v < 1.23.12v < 1.24.10v < 1.25.9v < 1.26.41.23.0 ≤ v < 1.23.121.24.0 ≤ v < 1.24.101.25.0 ≤ v < 1.25.91.26.0 ≤ v < 1.26.4

Affected range stops below 1.23.12, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.24.10, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.25.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.26.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRMExploitThird Party Advisory

Source: [email protected]

https://github.com/envoyproxy/envoy/security/advisories/GHSA-69vr-g55c-v2v4

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMGitHub_M

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-416

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