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Case File

CVE-2021-21424

MEDIUM · CVSS 5.3 EPSS 1.71% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-05-13 · Last synced 2026-08-04

CyberRota Analysis

This is a medium severity vulnerability with a CVSS score of 5.3. Public exploit code or proof-of-concept references have been detected in its references.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-21424
Severity
MEDIUM
CVSS
5.3
EPSS
1.71%

Original NVD 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.

Related CVEs

Other vulnerabilities affecting the same vendor(s)