CVE-2025-66220

| EUVD-2025-201090 MEDIUM
2025-12-03 [email protected] GHSA-rwjg-c3h2-f57p
5.0
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:N
Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

Lifecycle Timeline

5
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 15, 2026 - 16:14 vuln.today
EUVD ID Assigned
Mar 15, 2026 - 16:14 euvd
EUVD-2025-201090
PoC Detected
Dec 05, 2025 - 15:44 vuln.today
Public exploit code
CVE Published
Dec 03, 2025 - 19:15 nvd
MEDIUM 5.0

Tags

Information Disclosure Debian Envoy Redhat

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.

Analysis

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.

Technical Context

This vulnerability is classified as Improper Null Termination (CWE-170).

Affected Products

Affected products: Envoyproxy Envoy

Remediation

Monitor vendor advisories for patches. Apply mitigations such as network segmentation, access restrictions, and monitoring.

Priority Score

45
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +25
POC: +20

Vendor Status

Debian

Bug #987544
envoyproxy
Release Status Fixed Version Urgency
open - -

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CVE-2025-66220 vulnerability details – vuln.today
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