CVE-2021-39935

Name: CVE-2021-39935
Creator: NVD / NIST
Published: 2021-12-13T16:15:09.367+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10Actively ExploitedEPSS 30.50%

Last modified Jun 17, 2026

CVE-2021-39935 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 30.50% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

30.50%

98.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Feb 24, 2026.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Gitlab	Gitlab	>= 10.5.0, < 14.3.6
Gitlab	Gitlab	>= 14.4.0, < 14.4.4
Gitlab	Gitlab	>= 14.5.0, < 14.5.2

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.jsonThird Party Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/346187Issue Tracking, Vendor Advisory
https://hackerone.com/reports/1236965Permissions Required, Third Party Advisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.jsonThird Party Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/346187Issue Tracking, Vendor Advisory
https://hackerone.com/reports/1236965Permissions Required, Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39935US Government Resource

Timeline

Published: Dec 13, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-39935?

How severe is CVE-2021-39935?

CVE-2021-39935 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 30.50% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-39935?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-39935?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST