CVE-2021-22175: GitLab Server-Side Request Forgery (SSRF) Vulnerability

In short

GitLab GitLab has a weakness classified as server-side request forgery (CWE-918). CISA added it to its Known Exploited Vulnerabilities catalog on 2026-02-18. NVD lists CVSS 3.1 at 9.8 CRITICAL.

What it is

“GitLab contains a server-side request forgery (SSRF) vulnerability when requests to the internal network for webhooks are enabled.” — CISA KEV, retrieved 2026-11-01

“When requests to the internal network for webhooks are enabled, a server-side request forgery vulnerability in GitLab affecting all versions starting from 10.5 was possible to exploit for an unauthenticated attacker even on a GitLab instance where registration is disabled” — NVD, retrieved 2026-11-01

Who is affected

GitLab GitLab. NVD lists the following versions as affected:

• Versions from 10.5.0 inclusive, before 13.6.7
• Versions from 13.7.0 inclusive, before 13.7.7
• Versions from 13.8.0 inclusive, before 13.8.4

Exploitation status

CISA KEV added: 2026-02-18. Known ransomware campaign use: Not reported by CISA. Due date CISA set for US federal civilian agencies: 2026-03-11.

Scores

NVD CVSS 3.1: 9.8 CRITICAL; vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source [email protected].

EPSS by FIRST: 53.37%; percentile 98.99; score date 2026-10-31. EPSS estimates the probability of exploitation in the next 30 days.

CWE: CWE-918.

Timeline

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 KEV

What to do

• Confirm whether you run GitLab GitLab and which version.
• Apply the vendor update or mitigation in the advisory.
• Follow CISA’s required action.
• Review the vendor guidance on signs of compromise.
• Track the fix through completion.

References

• Vendor Advisory: https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22175.json
• Permissions Required, Third Party Advisory: https://hackerone.com/reports/1059596
• NVD detail
• CVE.org record
• CISA KEV catalog

Sources and dates

CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.

NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

EPSS scores by FIRST; score date 2026-10-31.