CVE-2021-21424

MEDIUM EPSS 74.5%
Published May 13, 20215y ago · Modified Jun 17, 20262w ago
5.3 CVSS 3.1
Medium
Find Similar
Published May 13, 2021 5y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.3
Exploitability
3.9
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity None
Availability None

Threat Intelligence

EPSS Exploit Probability
74.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor Information Exposure
CWE-203

Affected Products 5

VendorProductVersionRange
sensiolabssymfony*≥2.8.0  –  <3.4.48
sensiolabssymfony*≥4.0.0  –  <4.4.23
sensiolabssymfony*≥5.0.0  –  <5.2.8
fedoraprojectfedora33any
fedoraprojectfedora34any

References 7

  • github.com https://github.com/symfony/symfony/commit/2a581d22cc621b33d5464ed65c4bc2057f72f011
    PatchThird Party Advisory
  • github.com https://github.com/symfony/symfony/security/advisories/GHSA-5pv8-ppvj-4h68
    PatchThird Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2023/07/msg00014.html
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4/
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2M/
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJW/
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3/

Remediation

  • github.com https://github.com/symfony/symfony/commit/2a581d22cc621b33d5464ed65c4bc2057f72f011
    PatchThird Party Advisory
  • github.com https://github.com/symfony/symfony/security/advisories/GHSA-5pv8-ppvj-4h68
    PatchThird Party Advisory