CVE-2021-39935
MEDIUM severity · CVSS 6.8 · Server-side request forgery (SSRF) · actively exploited (CISA KEV)
6.8CVSS MEDIUM ● exploited
🔴 Actively exploited in the wild (CISA Known Exploited Vulnerabilities).
Added to KEV 2026-02-03. US federal agencies must patch by 2026-02-24.
Summary
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
Impact & exploitability
Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactNone
Availability impactNone
Exploit probability (EPSS)65%
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Affected products we track (1)
Recommendation
This vulnerability is being actively exploited in the wild — patch affected products urgently. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://gitlab.com/gitlab-org/gitlab/-/issues/346187Advisory
- https://gitlab.com/gitlab-org/gitlab/-/issues/346187Advisory
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.jsonAdvisory
- https://hackerone.com/reports/1236965Advisory
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.jsonAdvisory
- https://hackerone.com/reports/1236965Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39935