TI-2024-15429 Aliases CVE-2024-23327

Crash in proxy protocol when command type of LOCAL in Envoy

LOW 34CWE-476Published 2024-02-09 · Updated 2025-06-09

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-476.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00693 53rd percentileScored 2026-11-07

Fix Partial envoy (envoyproxy): 1.29.1, 1.28.1, 1.27.3 +1Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
envoyproxy	envoy	1.29.0 to before 1.29.1; 1.28.0 to before 1.28.1; 1.27.0 to before 1.27.3; before 1.26.7	1.29.1, 1.28.1, 1.27.3, 1.26.7	Patch available	CNA

envoy Vendorenvoyproxy Affected 1.29.0 to before 1.29.1; 1.28.0 to before 1.28.1; 1.27.0 to before 1.27.3; before 1.26.7 Fixed in 1.29.1, 1.28.1, 1.27.3, 1.26.7 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:envoyproxy:envoy::::::::	1.26.0 to before 1.26.7; 1.27.0 to before 1.27.3; 1.28.0 to before 1.28.1; 1.29.0 to before 1.29.1	Vulnerable	envoyproxy

cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* Versions 1.26.0 to before 1.26.7; 1.27.0 to before 1.27.3; 1.28.0 to before 1.28.1; 1.29.0 to before 1.29.1 Vulnerable ·envoyproxy

Remediation

Fix · CNA envoy (envoyproxy) Fixed in 1.29.1, 1.28.1, 1.27.3, 1.26.7

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
OpenShift Service Mesh 2	Affected	No fix yet

Timeline

2026-10-02 Threatist record created from CVE-2024-23327

References

Patch 1

https://github.com/envoyproxy/envoy/commit/63895ea8e3cca9c5d3ab4c5c128ed1369969d54a

Advisory 1

https://github.com/envoyproxy/envoy/security/advisories/GHSA-4h5x-x9vh-m29j

TI-2026-79288 Out-of-bounds write in Google Brotli decoder KEVCVSS 4.0CRITICAL 9.2
TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
TI-2024-20001 HTTP/2: CPU exhaustion due to CONTINUATION frame flood CVSS 3.1HIGH 7.5
TI-2024-18524 HTTP/2: memory exhaustion due to CONTINUATION frame flood CVSS 3.1HIGH 7.5
TI-2023-12215 Envoy client may fake the header `x-envoy-original-path` CVSS 3.1CRITICAL 9.1
TI-2023-18002 Envoy vulnerable to OAuth2 credentials exploit with permanent validity CVSS 3.1CRITICAL 9.8

See all 126 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences