GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability
GitLab — GitLab
An issue has been discovered in GitLab CE/EE affecting all versions starting from 10.5 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. Unauthorized external users could perform Server Side Requests via the CI Lint API
6.8
35.6%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
- Published
- Dec 13, 2021
- Modified
- Feb 3, 2026
- Added to KEV
- Feb 3, 2026
- Federal patch due
- Feb 24, 2026
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2021-39935, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit — cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2021-39935 were found at last check. Absence here is not proof no exploit exists — see the references below for vendor advisories and write-ups.
References
How this class of flaw gets exploited
Frequently asked questions
What is CVE-2021-39935?
An issue has been discovered in GitLab CE/EE affecting all versions starting from 10.5 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. Unauthorized external users could perform Server Side Requests via the CI Lint API
How severe is CVE-2021-39935?
CVE-2021-39935 has a CVSS base score of 6.8 out of 10 (CVSS 3.1).
Is CVE-2021-39935 actively exploited in the wild?
Yes. CVE-2021-39935 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Feb 3, 2026, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2021-39935?
35.6% - meaning FIRST.org's EPSS model estimates a 35.6% probability this vulnerability will be exploited in the wild within 30 days (98% percentile among all scored CVEs).
What type of vulnerability is CVE-2021-39935?
CVE-2021-39935 is classified under CWE-918 (CWE-918 Server-Side Request Forgery (SSRF)).
Cross-checked against
Impactr finds and proves whether CVE-2021-39935 — or flaws like it — are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.