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CVE-2021-39917

4.3 · MEDIUM

An issue has been discovered in GitLab CE/EE affecting all versions starting from 12.9 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2.

Published Dec 13, 2021CWE-697EPSS 1.37%

Overview

CVE-2021-39917 is a medium-severity vulnerability. It was published on December 13, 2021 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

An issue has been discovered in GitLab CE/EE affecting all versions starting from 12.9 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. A regular expression related to quick actions features was susceptible to catastrophic backtracking that could cause a DOS attack.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39917.jsonRefgitlab.com/gitlab-org/gitlab/-/issues/338486Refhackerone.com/reports/1277918Refgitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39917.jsonRefgitlab.com/gitlab-org/gitlab/-/issues/338486Refhackerone.com/reports/1277918

How CyberStrike helps

Frequently asked questions

What is CVE-2021-39917?

CVE-2021-39917 is a medium-severity vulnerability. It was published on December 13, 2021 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2021-39917?

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-39917?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-39917?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-39917 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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