CVE-2021-39917
MEDIUMGitLab 12.9-14.3.5, 14.4-14.4.3, 14.5-14.5.1 - Denial of Service via Quick Actions Regex Backtracking
Title source: llmDescription
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.
References (3)
Core 3
Core References
Broken Link x_refsource_misc
https://gitlab.com/gitlab-org/gitlab/-/issues/338486
Permissions Required, Third Party Advisory x_refsource_misc
https://hackerone.com/reports/1277918
Vendor Advisory x_refsource_confirm
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39917.json
Scores
CVSS v3
4.3
EPSS
0.0133
EPSS Percentile
67.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Details
CWE
CWE-697
Status
published
Products (1)
gitlab/gitlab
12.9.0 - 14.3.6 (2 CPE variants)
Published
Dec 13, 2021
Tracked Since
Feb 18, 2026