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.

CVSS v3 5.0 MEDIUM

5.0^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 0.7 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/envoyproxy/envoy/security/advisories/GHSA-rwjg-c3h2-f57p	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:envoyproxy:envoy::::::::
	cpe:2.3:a:envoyproxy:envoy::::::::
	cpe:2.3:a:envoyproxy:envoy::::::::
	cpe:2.3:a:envoyproxy:envoy::::::::

History

05 Dec 2025, 15:44

Type	Values Removed	Values Added
First Time		Envoyproxy Envoyproxy envoy
CPE		cpe:2.3:a:envoyproxy:envoy::::::::
References	~~() https://github.com/envoyproxy/envoy/security/advisories/GHSA-rwjg-c3h2-f57p -~~	() https://github.com/envoyproxy/envoy/security/advisories/GHSA-rwjg-c3h2-f57p - Exploit, Vendor Advisory

03 Dec 2025, 19:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-12-03 19:15

Updated : 2025-12-05 15:44

NVD link : CVE-2025-66220

Mitre link : CVE-2025-66220

CVE.ORG link : CVE-2025-66220

JSON object : View

Products Affected

envoyproxy

envoy

CWE

CWE-170

Improper Null Termination

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