CVE-2023-35942: Envoyproxy Envoy

Medium severity, CVSS 6.5. EPSS: 0.9% chance of exploitation in the next 30 days.

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 products

• Envoyproxy Envoy: from 1.23.0, before 1.23.12 (fixed in 1.23.12); from 1.24.0, before 1.24.10 (fixed in 1.24.10); from 1.25.0, before 1.25.9 (fixed in 1.25.9); from 1.26.0, before 1.26.4 (fixed in 1.26.4)

Published 2023-07-25. Last modified 2026-06-17.