CVE-2024-23327

Crash in proxy protocol when command type of LOCAL in Envoy

HIGH

7.5

CVSS Score

Published: February 9, 2024 at 10:41 PM UTC

Updated: June 17, 2026 at 07:12 AM UTC

1 product affected across 1 vendorEnvoy

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Severity

HIGH7.5

Exploit prediction

EPSS 0.7%

SSVC

No known exploit

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

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

Envoy · Envoyproxy

95%

v < 1.26.7v < 1.27.3v < 1.28.1v < 1.29.11.26.0 ≤ v < 1.26.71.27.0 ≤ v < 1.27.31.28.0 ≤ v < 1.28.11.29.0 ≤ v < 1.29.1

Affected range stops below 1.26.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.27.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.28.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.29.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

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

References (2)

x_refsource_MISCPatchThird Party Advisory

Source: [email protected]

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

x_refsource_CONFIRMThird Party Advisory

Source: [email protected]

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

7.5HIGHGitHub_M

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

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-476

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