CVE-2025-66220
December 03, 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.
Affected Packages
https://github.com/envoyproxy/envoy.git (GITHUB):
Affected version(s) >=v1.34.0 <v1.34.11Fix Suggestion:
Update to version v1.34.11https://github.com/envoyproxy/envoy.git (GITHUB):
Affected version(s) >=v1.36.0 <v1.36.3Fix Suggestion:
Update to version v1.36.3https://github.com/envoyproxy/envoy.git (GITHUB):
Affected version(s) >=v1.0.0 <v1.33.13Fix Suggestion:
Update to version v1.33.13https://github.com/envoyproxy/envoy.git (GITHUB):
Affected version(s) >=v1.35.0 <v1.35.7Fix Suggestion:
Update to version v1.35.7github.com/envoyproxy/envoy (GO):
Affected version(s) >=v1.35.0 <v1.35.7Fix Suggestion:
Update to version v1.35.7github.com/envoyproxy/envoy (GO):
Affected version(s) >=v1.36.0 <v1.36.3Fix Suggestion:
Update to version v1.36.3github.com/envoyproxy/envoy (GO):
Affected version(s) >=v1.34.0 <v1.34.11Fix Suggestion:
Update to version v1.34.11Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Null Termination
