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CVE-2025-66220

Good to know:

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Date: December 3, 2025

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.

Severity Score

Related Resources (4)

https://github.com/envoyproxy/envoy
https://github.com/envoyproxy/envoy/security/advisories/GHSA-rwjg-c3h2-f57p
https://nvd.nist.gov/vuln/detail/CVE-2025-66220
https://www.mend.io/vulnerability-database/CVE-2025-66220

Severity Score

Weakness Type (CWE)

Improper Null Termination

CWE-170

Top Fix

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Upgrade Version

Upgrade to version github.com/envoyproxy/envoy - v1.36.3;github.com/envoyproxy/envoy - v1.35.7;github.com/envoyproxy/envoy - v1.34.11;github.com/envoyproxy/envoy - v1.33.13;https://github.com/envoyproxy/envoy.git - v1.36.3;https://github.com/envoyproxy/envoy.git - v1.33.13;https://github.com/envoyproxy/envoy.git - v1.34.11;https://github.com/envoyproxy/envoy.git - v1.35.7

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): LOW
Availability (A): NONE

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