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CVE-2025-66220— Envoy’s TLS certificate matcher for `match_typed_subject_alt_names` may incorrectly treat certificates containing an embedded null byte

Quick assessment

Affected
envoyproxy envoy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Envoy是Enphase开源的一款用于连接智能家居设备的网关程序。 Envoy 1.33.12版本、1.34.10版本、1.35.6版本、1.36.2版本及之前版本存在安全漏洞，该漏洞源于mTLS证书匹配器错误处理嵌入空字节的证书，可能导致无效证书被接受。

CVSS 5.0 · Medium EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2025-66220

Vulnerability Information
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Vulnerability Title
Envoy’s TLS certificate matcher for `match_typed_subject_alt_names` may incorrectly treat certificates containing an embedded null byte
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当的空终结符
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是Enphase开源的一款用于连接智能家居设备的网关程序。 Envoy 1.33.12版本、1.34.10版本、1.35.6版本、1.36.2版本及之前版本存在安全漏洞，该漏洞源于mTLS证书匹配器错误处理嵌入空字节的证书，可能导致无效证书被接受。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
envoyproxy envoy >= 1.36.0, <= 1.36.2 -

II. Public POCs for CVE-2025-66220

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III. Intelligence Information for CVE-2025-66220

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Same Patch Batch · envoyproxy · 2025-12-03 · 3 CVEs total

CVE-2025-64527 6.5 MEDIUM Envoy crashes when JWT authentication is configured with the remote JWKS fetching
CVE-2025-64763 3.7 LOW Envoy forwards early CONNECT data in TCP proxy mode

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-170

V. Comments for CVE-2025-66220

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