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CVE-2021-39935

Published: Dec 13, 2021Updated: Feb 4, 2026 Sources: CVE List NVD BDUCWE-918
6.8MEDIUM
NVD MITRE
EPSS Score
35.6%
Top 1.6%
CISA KEV
Active Exploitation
Since Feb 3, 2026
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:CC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-918

Affected Products

GitLab
commercial·NLaka gitlab ce/ee
GitLabSaaSWeb App
DevTools & CI / ci-cd
GitLab Inc.
commercial·US
GitlabOn-premWeb App
DevTools & CI / source-control
and 1 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Feb 3, 2026
Remediation due:Feb 24, 2026

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.

Official Patch Available
Is your org exposed to CVE-2021-39935?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Command and Control
Initial Access
View detailed technique mapping

References

https://gitlab.com/gitlab-org/gitlab/-/issues/346187
gitlab.com
https://hackerone.com/reports/1236965
hackerone.com
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.json
gitlab.com
and 7 more references View all →
News mentions
2

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