CVE-2021-39867

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-05 · updated 2026-06-17
Weakness: CWE-918

Description

In all versions of GitLab CE/EE since version 8.15, a DNS rebinding vulnerability in Gitea Importer may be exploited by an attacker to trigger Server Side Request Forgery (SSRF) attacks.

Affected products

GitLab: from 8.15.0 before 14.1.7; from 14.2.0 before 14.2.5; 4.3.0 — fixed in 14.1.7, 14.2.5

How to fix

Upgrade to a fixed version: GitLab 14.1.7, 14.2.5. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39867.json
https://gitlab.com/gitlab-org/gitlab/-/issues/214401
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39867.json
https://gitlab.com/gitlab-org/gitlab/-/issues/214401

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