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CISA KEV · ACTIVELY EXPLOITED
HIGH severity

CVE-2021-39935 — gitlab

HIGH

CVE-2021-39935 is a high-severity (CVSS 7.5) Server-Side Request Forgery (SSRF) vulnerability. It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-02-03) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.

Also known asBIT-gitlab-2021-39935
Published
Updated
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Oct 23, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

  • Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-02-03. Federal agencies were required to remediate by 2026-02-24.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2021-39935.

EPSS Exploitation Probability

via FIRST.org ↗
36.1%probability of exploitation in next 30 days
Moderate Risk+0.49%
Lower risk than most CVEs98th percentile — riskier than 98% of all scored CVEsHighest risk
30.0%40.1%50.2%60.3%41.4%54.6%35.6%35.6%36.1%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-39935 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,803 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Counts from FIRST.org, log-scaled.

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

Affected Products

1 product · 6 configurations
Application
gitlabgitlab
≥ 14.5.0 && < 14.5.2
range

Detection & mitigation playbook

Vulnerability

  1. Detect

    Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

  2. Fix

    Upgrade the affected component to the fixed release for CVE-2021-39935, or apply your distribution's backported patch — distro builds are often patched at an older version number, so check your vendor's advisory rather than the upstream version alone.

  3. Workarounds

    Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.

Frequently Asked Questions

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
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Actively Exploited: CVE-2021-39935: gitlab (High 7.5)