What is CVE-2021-39867?

CVE-2021-39867 is a medium-severity vulnerability in GitLab, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.5/10. Published 2021-10-05.

How severe is CVE-2021-39867?

Medium severity. CVSS v3 base score is 6.5 out of 10.

SSRF in GitLab

CVE-2021-39867

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2021-10-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

GitLab — versions 4.3.0, >=14.3, <14.3.1, >=8.15, <14.1.7

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

gitlab.com/gitlab-org/gitlab/-/issues/214401 (Broken Link)
gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39867.json (Vendor Advisory)

Frequently asked questions

What is CVE-2021-39867?: CVE-2021-39867 is a medium-severity vulnerability in GitLab, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.5/10. Published 2021-10-05.
How severe is CVE-2021-39867?: Medium severity. CVSS v3 base score is 6.5 out of 10.