What is CVE-2021-22166?

CVE-2021-22166 is a medium-severity vulnerability in GitLab, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2021-01-15.

How severe is CVE-2021-22166?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Resource exhaustion in GitLab

CVE-2021-22166

An attacker could cause a Prometheus denial of service in GitLab 13.7+ by sending an HTTP request with a malformed method

Vulnerability class: DoS (Denial of Service)

Published 2021-01-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.014 (71.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

GitLab — versions >=13.7, <13.7.2

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

gitlab.com/gitlab-org/labkit/-/issues/29 (Broken Link)
gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22166.json (Third Party Advisory)

Frequently asked questions

What is CVE-2021-22166?: CVE-2021-22166 is a medium-severity vulnerability in GitLab, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2021-01-15.
How severe is CVE-2021-22166?: Medium severity. CVSS v3 base score is 5.3 out of 10.