CVE-2021-39867 Server-side request forgery in GitLab
An attacker can exploit a DNS rebinding flaw in the Gitea Importer to perform Server Side Request Forgery attacks against GitLab instances.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-39867?
CVE-2021-39867 is a medium-severity server-side request forgery vulnerability in Gitlab Gitlab, published on 5 Oct 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2021-39867?
1 open source package ship an affected version, including gitlab. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
gitlab Bitnami | From 8.15.0 | 14.1.7, 14.2.5, 14.3.1 |
Products include Gitlab Gitlab.
How do I fix CVE-2021-39867?
Upgrade gitlab to a fixed version for your release line: 14.1.7, 14.2.5 or 14.3.1.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2021-39867 being exploited?
There is no known exploitation of CVE-2021-39867 in the wild and no public exploit code.
Other vulnerabilities in Gitlab Gitlab
- CVE-2026-97229 GitLab Community Edition and Enterprise Edition Integer Overflow or Wraparound
- CVE-2026-85706 GitLab Community Edition and Enterprise Edition Path Traversal
- CVE-2023-7028 GitLab Community and Enterprise Editions Improper Access Control
- CVE-2021-22205 GitLab Community and Enterprise Editions Remote Code Execution
- CVE-2021-39935 GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF)
Sources
Also known as BIT-gitlab-2021-39867, GHSA-237m-vv9j-66q2, UBUNTU-CVE-2021-39867.