CVE-2025-66220

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.

Scoring

Severity

MEDIUM

CVSS base score

5

CVSS vector

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

EPSS probability

0.17%

CWE

CWE-170

Published

2025-12-03

Last modified

2026-03-13

Affected products

• envoyproxy envoy
• envoyproxy envoy
• envoyproxy envoy
• envoyproxy envoy

Weakness type

• CWE-170

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