CVE-2025-66220

HIGH EPSS 5.3%

Published Dec 3, 20256mo ago · Modified Jun 17, 20261w ago

7.1 CVSS 3.1

High

Published Dec 3, 2025 6mo ago

Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score

7.1

Exploitability

2.8

Impact

4.2

Vector string

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

Attack Vector Network

Attack Complexity Low

Privileges Required Low

User Interaction None

Scope Unchanged

Confidentiality High

Integrity Low

Availability None

Threat Intelligence

EPSS Exploit Probability

5.3% percentile

Exploit & Patch Status

Public Exploit Known

No Patch Available

Weaknesses 1

CWE-170

Affected Products 4

Vendor	Product	Version	Range
envoyproxy	envoy	*	<1.33.13
envoyproxy	envoy	*	≥1.34.0 – <1.34.11
envoyproxy	envoy	*	≥1.35.0 – <1.35.7
envoyproxy	envoy	*	≥1.36.0 – <1.36.3

References 1

github.com https://github.com/envoyproxy/envoy/security/advisories/GHSA-rwjg-c3h2-f57p

ExploitVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.