CVE-2021-39933

low-risk
Published 2021-12-13

An issue has been discovered in GitLab CE/EE affecting all versions starting from 12.10 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 used for handling user input (notes, comments, etc) was susceptible to catastrophic backtracking that could cause a DOS attack.

Do I need to act?

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0.19% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.3/10 Medium
NETWORK / LOW complexity

Affected Products (2)

Affected Vendors

Gitlab

References (6)

Third Party Advisory https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39933.json
Broken Link https://gitlab.com/gitlab-org/gitlab/-/issues/340449
Permissions Required https://hackerone.com/reports/1320077
Third Party Advisory https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39933.json
Broken Link https://gitlab.com/gitlab-org/gitlab/-/issues/340449
Permissions Required https://hackerone.com/reports/1320077
26
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 1/34 · Minimal
Exposure 7/34 · Low