Security Digest · Vulnerability record · Known exploited
CVE-2021-39935: GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability
Exploited in the wild (CISA KEV). 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.
CISA KEV · added 2026-02-03 CVSS 6.8 Medium EPSS 36.1% · p98
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run GitLab Community and Enterprise Editions. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-02-03, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-02-24; treat that as the outer limit, not the target.
- EPSS 36.1%, percentile 98: FIRST’s model estimates a 36.1% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
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
CISA’s summary
GitLab Community and Enterprise Editions contain a server-side request forgery vulnerability which could allow unauthorized external users to perform Server Side Requests via the CI Lint API.
Weakness type: CWE-918.
Product: GitLab Community and Enterprise Editions · Assigned by: GitLab · Published: 2021-12-13
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| GitLab | GitLab | >=10.5, <14.3.6, >=14.4, <14.4.4, >=14.5, <14.5.2 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitLab | 3.1 | 6.8 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N |
- Attack vector: network (remotely reachable)
- Attack complexity: high (needs special conditions)
- Privileges required: none (no login)
- User interaction: none
- Scope: changed (can affect other components)
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2026-02-03; federal due date 2026-02-24. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active, automatable no, technical impact partial.
- FIRST EPSS (model of 2026-10-21): 36.14% probability of exploitation activity in the next 30 days; percentile 98.
Timeline
- — CVE record published by GitLab
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CVE record last updated
- — CISA remediation deadline for US federal agencies
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- Listed in CISA KEV notes (about.gitlab.com) about.gitlab.com
Vulnerability records
- CVE.org record CVE-2021-39935 cve.org
- NVD entry CVE-2021-39935 nvd.nist.gov
Government
Other references from the CVE record and advisory
- gitlab.com gitlab.com
- hackerone.com hackerone.com
- gitlab.com gitlab.com
All exploited GitLab vulnerabilities · Today’s Security Digest