CVE-2025-66220

PoC —

CVSS 3.1

7.1 high

EPSS

<1%p6

Published

Dec 3, 2025 (Dec 3, 2025)

Modified

Jun 17, 2026

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.

Vendors: envoyproxy
Products: envoy
Weakness: CWE-170
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (0.2%)

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