Traefik is an HTTP reverse proxy and load balancer. Prior to version 2.6.1, Traefik skips the router transport layer security (TLS) configuration when the host header is a fully qualified domain name (FQDN). For a request, the TLS configuration choice can be different than the router choice, which implies the use of a wrong TLS configuration. When sending a request using FQDN handled by a router configured with a dedicated TLS configuration, the TLS configuration falls back to the default configuration that might not correspond to the configured one. If the CNAME flattening is enabled, the selected TLS configuration is the SNI one and the routing uses the CNAME value, so this can skip the expected TLS configuration. Version 2.6.1 contains a patch for this issue. As a workaround, one may add the FDQN to the host rule. However, there is no workaround if the CNAME flattening is enabled.
History

Thu, 24 Apr 2025 08:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2022-02-17T14:55:10.000Z

Updated: 2025-04-23T19:02:55.624Z

Reserved: 2022-01-19T00:00:00.000Z

Link: CVE-2022-23632

cve-icon Vulnrichment

Updated: 2024-08-03T03:51:46.023Z

cve-icon NVD

Status : Modified

Published: 2022-02-17T15:15:09.580

Modified: 2024-11-21T06:48:58.613

Link: CVE-2022-23632

cve-icon Redhat

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