CVE-2021-39933 json
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 befo…
published 4y ago modified last mo. also BIT-gitlab-2021-39933 , EUVD-2021-26289
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.5%
- EPSS 1.5% chance of exploitation in 30 days, percentile 73%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami gitlab 14.3.6, 14.4.4, 14.5.2
- gitlab gitlab 14.3.6, 14.4.4, 14.5.2
- gitlab gitlab_enterprise 14.3.6, 14.4.4, 14.5.2
- gitlab Arch Linux 14.5.2-1
arch linux advisories AVG-2603
Is CVE-2021-39933 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
1.47% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:N/I:N/A:P |
| OSV | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | gitlab | >=12.10.0, <14.3.6 >=14.4.0, <14.4.4 >=14.5.0, <14.5.2 |
14.3.6 14.4.4 14.5.2 |
Affected products
- GitLab GitLab
Classification
- Weakness
-
- CWE-1333 Inefficient Regular Expression Complexity
- Technology feeds
References
-
gitlab.com
/gitlab-org/gitlab/-/issues/340449
broken-link, web
-
hackerone.com
/reports/1320077
permissions-required, third-party-advisory, advisory
-
gitlab.com
/gitlab-org/cves/-/blob/master/2021/CVE-2021-39933.json
third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-39933
web
Sources
- CVE List CVE-2021-39933
- NVD CVE-2021-39933
- OSV BIT-gitlab-2021-39933
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Enhance with deb and rpm package type records.