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CVE-2021-39935

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

6.8 MEDIUMActively exploited (CISA KEV)EPSS 36.1%
  1. Published13 Dec 2021
  2. Added to CISA KEV3 Feb 2026
  3. Remediation due24 Feb 2026
Actively exploited (CISA KEV)

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.

Added to KEV: 3 Feb 2026Federal remediation due: 24 Feb 2026

Description

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 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Affected products

GitLab≥ 10.5.0 < 14.3.6 · ≥ 14.4.0 < 14.4.4 · ≥ 14.5.0 < 14.5.2

Remediation

Fixed in
GitLab≥ 14.3.6

References

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Frequently asked

Is CVE-2021-39935 being actively exploited?

Yes. CVE-2021-39935 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Feb 2026.

How severe is CVE-2021-39935?

CVE-2021-39935 has a CVSS 3.1 base score of 6.8, rated medium. EPSS estimates a 36.1% probability of exploitation.

Which products are affected by CVE-2021-39935?

Affected products include GitLab.

How do I fix CVE-2021-39935?

Upgrade affected software to a fixed version, for example GitLab 14.3.6 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-39935 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.