CVE-2021-32813: traefik

Vulnerability summary

CVE-2021-32813 is a high (CVSS 8.1) vulnerability in traefik. EPSS estimates a 1.10% chance of exploitation in the next 30 days, higher than 65.1% of scored vulnerabilities.

Timeline

1. 03-08-2021
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

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 Traefik middlewares, and one of them sets a request header, then sending a request with a certain Connection header will cause it to be removed before the request is sent. In this case, the backend does not see the request header. A patch is available in version 2.4.13. There are no known workarounds aside from upgrading.

• CWE-913Improper Control of Dynamically-Managed Code ResourcesThe product does not properly restrict reading from or writing to dynamically-managed code resources such as variables, objects, classes, attributes, functions, or executable instructions or statements.