How severe is CVE-2021-21424?

This vulnerability has a severity rating of MEDIUM with a CVSS score of 5.3 out of 10.

What type of vulnerability is CVE-2021-21424?

This is classified as CWE-200, which is a common weakness in software security.

CVE-2021-21424 - MEDIUM Severity | CVSS 5.3

Vulnerability 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.

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