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CVE-2021-21424

5.3 · MEDIUM

Symfony is a PHP framework for web and console applications and a set of reusable PHP components.

Published May 13, 2021CWE-200EPSS 1.64%

Overview

CVE-2021-21424 is a medium-severity vulnerability. It was published on May 13, 2021 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.

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/2a581d22cc621b33d5464ed65c4bc2057f72f011GitHubgithub.com/symfony/symfony/security/advisories/GHSA-5pv8-ppvj-4h68Reflists.debian.org/debian-lts-announce/2023/07/msg00014.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2M/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJW/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3/GitHubgithub.com/symfony/symfony/commit/2a581d22cc621b33d5464ed65c4bc2057f72f011GitHubgithub.com/symfony/symfony/security/advisories/GHSA-5pv8-ppvj-4h68Reflists.debian.org/debian-lts-announce/2023/07/msg00014.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-21424?

CVE-2021-21424 is a medium-severity vulnerability. It was published on May 13, 2021 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2021-21424?

This vulnerability has a CVSS 3.1 base score of 5.3, 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-2021-21424?

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-2021-21424?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-21424 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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