Server-Side Request Forgery (SSRF) in GitLab Enterprise Edition and Gitlab Community Edition - CVE-2021-39935
Published: December 9, 2021 / Updated: March 14, 2025
Vulnerability identifier: #VU58754
CSH Severity: High
CVSS v4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2021-39935
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The disclosed vulnerability allows a remote attacker to perform SSRF attacks.
The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.
Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.
Affected software
GitLab Enterprise Edition
Gitlab Community Edition
Arch Linux
Gitlab Community Edition
Arch Linux
How to mitigate CVE-2021-39935
Install updates from vendor's website.
GitLab Enterprise Edition - addressed in versions 14.3.6, 14.4.4, 14.5.2
Gitlab Community Edition - addressed in versions 14.3.6, 14.4.4, 14.5.2
Gitlab Community Edition - addressed in versions 14.3.6, 14.4.4, 14.5.2