CVE-2021-39935 — GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vuln
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
Published
2021-12-13T15:47:59.000Z
Last modified
2026-02-03T17:20:23.263Z
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
CISA KEV — Actively Exploited
01What is this vulnerability?
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
02Affected products
| Vendor | Product | Versions |
|---|
| GitLab | GitLab | >=10.5, <14.3.6, >=14.4, <14.4.4, >=14.5, <14.5.2 |
03Active exploitation status
Yes — actively exploited. Added to the CISA KEV catalog on 2026-02-03. Ransomware use: Unknown.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:
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07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2021-12-13T15:47:59.000Z
- Last modified: 2026-02-03T17:20:23.263Z
- Added to CISA KEV: 2026-02-03
- BOD 22-01 due: 2026-02-24
09References
- gitlab.com — https://gitlab.com/gitlab-org/gitlab/-/issues/346187
- hackerone.com — https://hackerone.com/reports/1236965
- gitlab.com — https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.json
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