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CVE-2021-32813

4.8 · MEDIUM

Traefik is an HTTP reverse proxy and load balancer.

Published Aug 3, 2021CWE-913EPSS 1.10%

Overview

CVE-2021-32813 is a medium-severity vulnerability. It was published on August 3, 2021 and has a CVSS 3.1 base score of 4.8 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.8, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/traefik/traefik/pull/8319/commits/cbaf86a93014a969b8accf39301932c17d0d73f9GitHubgithub.com/traefik/traefik/releases/tag/v2.4.13GitHubgithub.com/traefik/traefik/security/advisories/GHSA-m697-4v8f-55qgGitHubgithub.com/traefik/traefik/pull/8319/commits/cbaf86a93014a969b8accf39301932c17d0d73f9GitHubgithub.com/traefik/traefik/releases/tag/v2.4.13GitHubgithub.com/traefik/traefik/security/advisories/GHSA-m697-4v8f-55qg

How CyberStrike helps

Frequently asked questions

What is CVE-2021-32813?

CVE-2021-32813 is a medium-severity vulnerability. It was published on August 3, 2021 and has a CVSS 3.1 base score of 4.8 (MEDIUM).

How severe is CVE-2021-32813?

This vulnerability has a CVSS 3.1 base score of 4.8, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-32813?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-32813?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-32813 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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