CVE-2025-66220

MEDIUM5.0EPSS 0.00%

Envoy’s TLS certificate matcher for `match_typed_subject_alt_names` may incorrectly treat certificates containing an embedded null byte

Published: 12/5/2025Modified: 12/9/2025

Also known as:GHSA-rwjg-c3h2-f57pBIT-envoy-2025-66220

Description

Envoy is a high-performance edge/middle/service proxy. In 1.33.12, 1.34.10, 1.35.6, 1.36.2, and earlier, Envoy’s mTLS certificate matcher for match_typed_subject_alt_names may incorrectly treat certificates containing an embedded null byte (\0) inside an OTHERNAME SAN value as valid matches.

Affected packages (2)

Bitnami/envoyfrom 0, < 1.33.13, >= 1.34.0, < 1.34.11, >= 1.35.0, < 1.35.7, >= 1.36.0, < 1.36.3
Go/github.com/envoyproxy/envoy>= 1.36.0, < 1.36.3

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	MEDIUM5.0	CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:N

References (3)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2025-66220
PATCHhttps://github.com/envoyproxy/envoy
WEBhttps://github.com/envoyproxy/envoy/security/advisories/GHSA-rwjg-c3h2-f57p