---
title: "CVE-2021-39935: GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability"
url: https://erroneo.us/security/cve/CVE-2021-39935/
description: "CVE-2021-39935 (GitLab Community and Enterprise Editions): Exploited in the wild (CISA KEV). An issue has been discovered in GitLab CE/EE affecting all…"
type: vulnerability-record
section: "Security Digest"
date_published: 2021-12-13
date_modified: 2026-02-03
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2021-39935"
kev: true
cvss: 6.8
epss: 0.3614
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2021-39935: GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run GitLab Community and Enterprise Editions. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-02-03, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-02-24 ; treat that as the outer limit, not the target.
- EPSS 36.1% , percentile 98: FIRST’s model estimates a 36.1% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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 (CVE record)

- GitLab GitLab: >=10.5, <14.3.6, >=14.4, <14.4.4, >=14.5, <14.5.2

## Severity

- GitLab CVSS 3.1: 6.8 `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N`

## Exploitation

- CISA KEV: added 2026-02-03; federal due date 2026-02-24. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable no , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 36.14% probability of exploitation activity in the next 30 days; percentile 98.

## Sources

- [Listed in CISA KEV notes (about.gitlab.com)](https://about.gitlab.com/releases/2021/12/06/security-release-gitlab-14-5-2-released/)
- [CVE.org record CVE-2021-39935](https://www.cve.org/CVERecord?id=CVE-2021-39935)
- [NVD entry CVE-2021-39935](https://nvd.nist.gov/vuln/detail/CVE-2021-39935)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39935)
- [gitlab.com](https://gitlab.com/gitlab-org/gitlab/-/issues/346187)
- [hackerone.com](https://hackerone.com/reports/1236965)
- [gitlab.com](https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.json)

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Source page: https://erroneo.us/security/cve/CVE-2021-39935/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt