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CVE-2021-39935

7.5, high Known exploited

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

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
7.5, high high CVSS v3.1
EPSS, next 30 days
36% higher than 98.4% of scored CVEs
Exploitation
Confirmed in the wild
Published
13 Dec 20214 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 3 Feb 2026. US federal agencies had to remediate by 24 Feb 2026, a deadline that has passed.

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.

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

Details

Vendor
GitLab
Product
GitLab
Weakness
CWE-918 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
cve@gitlab.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References 4

Advisories 3

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other GitLab CVEs

Every GitLab CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-85706 GitLab Community Edition and Enterprise Edition Path Traversal Vulnerability KEV EPSS 93% 10, critical
  • CVE-2023-7028 GitLab Community and Enterprise Editions Improper Access Control Vulnerability KEV EPSS 95% 9.8, critical
  • CVE-2021-22175 GitLab Server-Side Request Forgery (SSRF) Vulnerability KEV EPSS 53% 9.8, critical
  • CVE-2021-22205 GitLab Community and Enterprise Editions Remote Code Execution Vulnerability KEV EPSS 100% 10, critical
  • CVE-2026-75871 GitLab AI Gateway Server-Side Request Forgery Vulnerability EPSS 0.3% 9.6, critical
  • CVE-2026-18252 GitLab has remediated an issue in GitLab EE affecting all versions from 18.9 before 19.1.7, 19.2 before 19.2.5, and 19.3 before 19.3.1… EPSS 0.4% 8.1, high

Beyond this page

Is CVE-2021-39935 in your network?

This page tells you how dangerous CVE-2021-39935 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2021-39935 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2021-39935 comes with the devices to patch.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 18 Oct 2026, not the live upstream state.