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Advisories

Traefik before v2.11.55 mTLS Bypass via TLS Option Conflict

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severity
high
date
Affecting

  • traefik >= 0, < 2.11.55

  • traefik <= 3.7.12

CWE
  • CWE-863 Incorrect Authorization
CVSS
8.2
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Credit
james-yusuke
Description
Traefik before v2.11.55 contains a TLS option conflict resolution vulnerability that allows unauthenticated attackers to bypass client-certificate authentication by creating conflicting TLS options on multi-host routers. Attackers can reach protected backends by exploiting shared TLS resolution across multiple hostnames in a single router rule, causing the strict mTLS requirement to fall back to default options for all hosts.

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