CVE-2021-39914 Denial of service in GitLab
Attackers can cause resource exhaustion and service disruption in GitLab by using specially crafted usernames during user provisioning.
- 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-2021-39914?
CVE-2021-39914 is a low-severity denial of service vulnerability in Gitlab Gitlab, published on 4 Nov 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A regular expression denial of service issue in GitLab versions 8.13 to 14.2.5, 14.3.0 to 14.3.3 and 14.4.0 could cause excessive usage of resources when a specially crafted username was used when provisioning a new user
Weakness: CWE-400
Which versions are affected by CVE-2021-39914?
1 open source package ship an affected version, including gitlab. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
gitlab Bitnami | From 8.13.0 | 14.2.6, 14.3.4, 14.4.1 |
Products include Gitlab Gitlab.
How do I fix CVE-2021-39914?
Upgrade gitlab to a fixed version for your release line: 14.2.6, 14.3.4 or 14.4.1.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-39914 being exploited?
There is no known exploitation of CVE-2021-39914 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-2021-39914, GHSA-wvgj-pjc7-8fc4, UBUNTU-CVE-2021-39914.