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I. Basic Information for CVE-2025-66491
Vulnerability Information

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Vulnerability Title
Traefik has Inverted TLS Verification Logic in its ingress-nginx Provider
Source: NVD (National Vulnerability Database)
Vulnerability Description
Traefik is an HTTP reverse proxy and load balancer. Versions 3.5.0 through 3.6.2 have inverted TLS verification logic in the nginx.ingress.kubernetes.io/proxy-ssl-verify annotation. Setting the annotation to "on" (intending to enable backend TLS certificate verification) actually disables verification, allowing man-in-the-middle attacks against HTTPS backends when operators believe they are protected. This issue is fixed in version 3.6.3.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
证书验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Traefik 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik开源的一款开源的反向代理与负载均衡工具。 Traefik 3.5.0版本至3.6.2版本存在安全漏洞,该漏洞源于TLS验证逻辑反转,可能导致中间人攻击。
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
VendorProductAffected VersionsCPESubscribe
traefiktraefik >= 3.5.0, < 3.6.3 -
II. Public POCs for CVE-2025-66491
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III. Intelligence Information for CVE-2025-66491
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IV. Related Vulnerabilities
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