What is CVE-2021-39879?

CVE-2021-39879 is a low-severity vulnerability in GitLab, classified under Missing Authentication for Critical Function. CVSS score: 2.2/10. Published 2021-10-04.

How severe is CVE-2021-39879?

Low severity. CVSS v3 base score is 2.2 out of 10.

Auth bypass in GitLab

CVE-2021-39879

Missing authentication in all versions of GitLab CE/EE since version 7.11.0 allows an attacker with access to a victim's session to disable two-factor authentication

Vulnerability class: Broken Authentication

Published 2021-10-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 2.2 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (32.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

GitLab — versions >=7.11.0, <14.1.7

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

gitlab.com/gitlab-org/gitlab/-/issues/338825 (Broken Link)
gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39879.json (Vendor Advisory)

Frequently asked questions

What is CVE-2021-39879?: CVE-2021-39879 is a low-severity vulnerability in GitLab, classified under Missing Authentication for Critical Function. CVSS score: 2.2/10. Published 2021-10-04.
How severe is CVE-2021-39879?: Low severity. CVSS v3 base score is 2.2 out of 10.