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Vulnerabilities

Vulnerability · CVE-2021-39935

GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability

Published Dec 13, 2021 · catalog updated Jun 16, 2026 · GitLab Community and Enterprise Editions

Patch now

CVE-2021-39935 is in the CISA known-exploited catalog, due Feb 24, 2026. Confirm GitLab Community and Enterprise Editions against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
High7.5
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
36.14%
Remediation
Remediation guidance
Affected products
cpe gitlab/gitlab · vendor GitLab Community and Enterprise Editions

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe gitlab/gitlabversion unspecified
  • vendor GitLab Community and Enterprise Editionsversion unspecified

How to fix CVE-2021-39935

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-39935 is in the CISA known-exploited catalog, due Feb 24, 2026. Confirm GitLab Community and Enterprise Editions against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-918: Server-Side Request Forgery (SSRF). EPSS 36.14%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 13, 2021 · Catalog

    Detected

    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

  2. Feb 3, 2026 · CISA KEV

    Known exploited

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  3. Feb 24, 2026 · CISA KEV

    Remediation due

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  4. Jun 16, 2026 · Catalog

    Updated

    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

Sources

  • CISA KEVConfirmed exploitationCVE-2021-39935

    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.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2021-39935

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-39935

    30-day exploitation probability 36.1%

    first.org
  • NIST NVDVulnerability recordCVE-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

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2021-39935

    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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.