CVE-2024-23327: Crash in proxy protocol when command type of LOCAL in Envoy

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-02-09 · updated 2026-06-17
Weakness: CWE-476

Description

Envoy is a high-performance edge/middle/service proxy. When PPv2 is enabled both on a listener and subsequent cluster, the Envoy instance will segfault when attempting to craft the upstream PPv2 header. This occurs when the downstream request has a command type of LOCAL and does not have the protocol block. This issue has been addressed in releases 1.29.1, 1.28.1, 1.27.3, and 1.26.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

envoyproxy envoy: from 1.26.0 before 1.26.7; from 1.27.0 before 1.27.3; from 1.28.0 before 1.28.1; from 1.29.0 before 1.29.1 — fixed in 1.26.7, 1.27.3, 1.28.1, 1.29.1

How to fix

Upgrade to a fixed version: envoyproxy envoy 1.26.7, 1.27.3, 1.28.1, 1.29.1. Check the vendor advisory for mitigations.

References

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