CVE-2021-39935: GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
An issue has been discovered in GitLab CE/EE affecting all versions starting from 10.5 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. Unauthorized external users could perform Server Side Requests via the CI Lint API
Description quoted from the CVE record (assigned by GitLab, published 2021-12-13).
Weakness: CWE-918 Server-Side Request Forgery (SSRF)
How it can be exploited
Exploitable over the network with high attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity none, availability none. CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: no. Technical impact: partial.
- On CISA KEV since
- 2026-02-03
- US federal deadline
- 2026-02-24
- Ransomware use
- Not known
Public exploit evidence (Exploit Observer)
Also known as: BDU:2025-02875, CNNVD-202112-435, EUVD-2021-26291, GHSA-22hj-9cx7-p2hw
VEDAS cluster: VEDAS:DRAGONSTARE
Exploit Observer has no public exploit code that names this CVE or one of its aliases.
Research and write-ups (2)
- Research or write-up: https://cve.report/CVE-2021-39935
- Research or write-up: https://security.archlinux.org/CVE-2021-39935
Vulnerability databases and vendor advisories (9)
Catalogue entries, not exploit evidence.
- Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2021-26291
- Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-22hj-9cx7-p2hw
- Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-39935
- Vulnerability database or vendor advisory: https://osv.dev/vulnerability/CVE-2021-39935
- Vulnerability database or vendor advisory: https://osv.dev/vulnerability/UBUNTU-CVE-2021-39935
- Vulnerability database or vendor advisory: https://security-tracker.debian.org/tracker/CVE-2021-39935
- Vulnerability database or vendor advisory: https://ubuntu.com/security/CVE-2021-39935
- Vulnerability database or vendor advisory: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39935
- Vulnerability database or vendor advisory: https://www.cnnvd.org.cn/home/globalSearch?keyword=CNNVD-202112-435
31 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.
VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.
Live scores
- EPSS
- 0.361
likely to be attacked soon - VEDAS
- 0.981
strong exploit evidence - On CISA KEV
- Yes, since 2026-02-03
- Detection rule
- None yet
Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish. The vertical line is the day CISA added it to its exploited list.
VEDAS flagged this bug about 170 days before CISA confirmed attacks.
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| GitLab GitLab | version >=10.5, <14.3.6 version >=14.4, <14.4.4 version >=14.5, <14.5.2 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
Exploit Observer also maps it to: gitlab gitlab, gitlab_inc. gitlab.
How to fix it
CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor guidance:
- https://about.gitlab.com/releases/2021/12/06/security-release-gitlab-14-5-2-released/
- https://nvd.nist.gov/vuln/detail/CVE-2021-39935
How to detect it
There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.
References
Government sources
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39935 (government-resource)
Other references
- https://gitlab.com/gitlab-org/gitlab/-/issues/346187 (x_refsource_MISC)
- https://hackerone.com/reports/1236965 (x_refsource_MISC)
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.json (x_refsource_CONFIRM)
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.