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CVE-2021-39935

Known Exploited (CISA KEV)MEDIUM

6.8

CVSS Severity Score

EPSS Score57.5320%

EPSS Percentile88.57th

PublishedDec 13, 2021

Last ModifiedFeb 4, 2026

Vulnerability 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 Platforms (CPE)

📦

Gitlab

Gitlab

>= 10.5.0 and < 14.3.6

📦

Gitlab

Gitlab

>= 10.5.0 and < 14.3.6

📦

Gitlab

Gitlab

>= 14.4.0 and < 14.4.4

📦

Gitlab

Gitlab

>= 14.4.0 and < 14.4.4

📦

Gitlab

Gitlab

>= 14.5.0 and < 14.5.2

📦

Gitlab

Gitlab

>= 14.5.0 and < 14.5.2

References & Advisories

🔗 https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.json

🔗 https://gitlab.com/gitlab-org/gitlab/-/issues/346187

🔗 https://hackerone.com/reports/1236965

🔗 https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.json

🔗 https://gitlab.com/gitlab-org/gitlab/-/issues/346187

🔗 https://hackerone.com/reports/1236965

🔗 https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39935

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