CVE-2024-23327

Name: CVE-2024-23327
Creator: NVD / NIST
Published: 2024-02-09T23:15:09.647+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.69%

Last modified Jun 17, 2026

CVE-2024-23327 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.69% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.69%

48.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Envoyproxy	Envoy	>= 1.26.0, < 1.26.7
Envoyproxy	Envoy	>= 1.27.0, < 1.27.3
Envoyproxy	Envoy	>= 1.28.0, < 1.28.1
Envoyproxy	Envoy	>= 1.29.0, < 1.29.1

References

https://github.com/envoyproxy/envoy/commit/63895ea8e3cca9c5d3ab4c5c128ed1369969d54aPatch, Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-4h5x-x9vh-m29jThird Party Advisory
https://github.com/envoyproxy/envoy/commit/63895ea8e3cca9c5d3ab4c5c128ed1369969d54aPatch, Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-4h5x-x9vh-m29jThird Party Advisory

Timeline

Published: Feb 9, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2024-23327?

How severe is CVE-2024-23327?

CVE-2024-23327 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.69% probability of exploitation in the next 30 days.

How do I fix CVE-2024-23327?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-23327?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST