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    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.

    Published:Dec 3, 2025
    Last Modified:Dec 5, 2025
    EPS:Dec 3, 2025
    EPSS Score:0.00049
    CVSS Score:5

    Affected Products

    Vendor
    Envoyproxy
    Product
    Envoy

    Exploits

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

    Common Weakness Enumeration

    CWE-170 Improper Null Termination

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High