CVE-2021-22175 — When requests to the internal network for webhooks are enabled, a server-side re

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

01What is this vulnerability?

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

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2026-02-18. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2021-06-11T16:15:09.023
• Last modified: 2026-10-01T19:17:14.190
• Added to CISA KEV: 2026-02-18

09References

• gitlab.com — https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22175.json
• gitlab.com — https://gitlab.com/gitlab-org/gitlab/-/issues/294178
• hackerone.com — https://hackerone.com/reports/1059596
• gitlab.com — https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22175.json
• gitlab.com — https://gitlab.com/gitlab-org/gitlab/-/issues/294178
• hackerone.com — https://hackerone.com/reports/1059596
• www.cisa.gov — https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-…