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Servers and applications

CVE-2021-32813

Drop Headers via Malicious Connection Header

Severity
High 8.1
Published
3 Aug 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
2.4.13
Also known as
GHSA-m697-4v8f-55qg
Sources
NVD, Project advisories (GitHub)

Description

Traefik is an HTTP reverse proxy and load balancer. Prior to version 2.4.13, there exists a potential header vulnerability in Traefik's handling of the Connection header. Active exploitation of this issue is unlikely, as it requires that a removed header would lead to a privilege escalation, however, the Traefik team has addressed this issue to prevent any potential abuse. If one has a chain of…

Affected software

SoftwareAffected versions
TraefikServers and applications · cpe:a:traefik:traefik
  • Every version before 2.4.13
TraefikServers and applications · github:traefik/traefik
  • Every version before 2.4.13
  • Every version up to 1.7.30

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-32813
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-32813
  • GitHub Advisory Database https://github.com/advisories/GHSA-m697-4v8f-55qg
  • github.com https://github.com/traefik/traefik/security/advisories/GHSA-m697-4v8f-55qg