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CVE

CVE-2021-21424

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumera

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.

MEDIUM · CVSS 5.3 EPSS 0.00337
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

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

Affected Products & Versions

4
sensiolabs symfony>= 2.8.0 and < 3.4.48
sensiolabs symfony>= 4.0.0 and < 4.4.23
sensiolabs symfony>= 5.0.0 and < 5.2.8
fedoraproject fedoraall versions
▤

Affected Packages

7
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Packagist lexik/jwt-authentication-bundle MEDIUM fixed in 2.10.7
Packagist symfony/maker-bundle MEDIUM fixed in 1.29.2
Packagist symfony/security MEDIUM fixed in 5.2.8
Packagist symfony/security-core MEDIUM fixed in 3.4.48
Packagist symfony/security-guard MEDIUM fixed in 3.4.48
Packagist symfony/security-http MEDIUM fixed in 5.2.8
Packagist symfony/symfony MEDIUM fixed in 3.4.49
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD13 May 2021 · 04:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
⚑

Vendor Advisories

1
usnUSN-5290-1
🔗

References & Sources

7
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/symfony/symfony/commit/2a581d22cc621b33d5464ed65c4bc2057f72f011PatchThird Party Advisory
https://github.com/symfony/symfony/security/advisories/GHSA-5pv8-ppvj-4h68PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/07/msg00014.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2M/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJW/
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