CVE-2021-39935
KEVGitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability
Description
GitLab Community and Enterprise Editions contain a server-side request forgery vulnerability which could allow unauthorized external users to perform Server Side Requests via the CI Lint API.
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
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:NPublishedDec 13, 2021
Last modifiedJun 17, 2026
Added to KEVFeb 3, 2026
Remediation dueFeb 24, 2026
References
- gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.jsonThird Party Advisory
- gitlab.com/gitlab-org/gitlab/-/issues/346187Issue TrackingVendor Advisory
- hackerone.com/reports/1236965Permissions RequiredThird Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39935US Government Resource
0 recent articles mention this CVE
68
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 244 days
- CVSS
- 6.8 MEDIUM
- EPSS (30-day exploit probability)
- 36.1% · top 2% of all CVEs
- Weakness
- CWE-918
- Attack vector
- Network, remotely reachable
- Preconditions
- No privileges and no user interaction
Recommended actions
- 1.Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.