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CVE-2021-41267

6.5 · MEDIUM

Symfony/Http-Kernel is the HTTP kernel component for Symfony, a PHP framework for web and console applications and a set of reusable PHP components.

Published Nov 24, 2021CWE-444EPSS 1.28%

Overview

CVE-2021-41267 is a medium-severity vulnerability. It was published on November 24, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Symfony/Http-Kernel is the HTTP kernel component for Symfony, a PHP framework for web and console applications and a set of reusable PHP components. Headers that are not part of the "trusted_headers" allowed list are ignored and protect users from "Cache poisoning" attacks. In Symfony 5.2, maintainers added support for the `X-Forwarded-Prefix` headers, but this header was accessible in SubRequest, even if it was not part of the "trusted_headers" allowed list. An attacker could leverage this opportunity to forge requests containing a `X-Forwarded-Prefix` header, leading to a web cache poisoning issue. Versions 5.3.12 and later have a patch to ensure that the `X-Forwarded-Prefix` header is not forwarded to subrequests when it is not trusted.

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/symfony/symfony/commit/95dcf51682029e89450aee86267e3d553aa7c487GitHubgithub.com/symfony/symfony/pull/44243GitHubgithub.com/symfony/symfony/releases/tag/v5.3.12GitHubgithub.com/symfony/symfony/security/advisories/GHSA-q3j3-w37x-hq2qGitHubgithub.com/symfony/symfony/commit/95dcf51682029e89450aee86267e3d553aa7c487GitHubgithub.com/symfony/symfony/pull/44243GitHubgithub.com/symfony/symfony/releases/tag/v5.3.12GitHubgithub.com/symfony/symfony/security/advisories/GHSA-q3j3-w37x-hq2q

How CyberStrike helps

Frequently asked questions

What is CVE-2021-41267?

CVE-2021-41267 is a medium-severity vulnerability. It was published on November 24, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2021-41267?

This vulnerability has a CVSS 3.1 base score of 6.5, 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-2021-41267?

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-2021-41267?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-41267 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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