What is CVE-2020-13309?

CVE-2020-13309 is a medium-severity vulnerability in GitLab, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.4/10. Published 2020-09-14.

How severe is CVE-2020-13309?

Medium severity. CVSS v3 base score is 5.4 out of 10.

SSRF in GitLab

CVE-2020-13309

A vulnerability was discovered in GitLab versions before 13.1.10, 13.2.8 and 13.3.4. GitLab was vulnerable to a blind SSRF attack through the repository mirroring feature.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2020-09-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.013 (68.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

GitLab — versions >=1.0, <13.1.10, >=13.2, <13.2.8, >=13.3, <13.3.4

Weakness classification (CWE)

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

References

gitlab.com/gitlab-org/gitlab/-/issues/215879 (Broken Link)
hackerone.com/reports/860196 (Permissions Required)
gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13309.json (Third Party Advisory)

Frequently asked questions

What is CVE-2020-13309?: CVE-2020-13309 is a medium-severity vulnerability in GitLab, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.4/10. Published 2020-09-14.
How severe is CVE-2020-13309?: Medium severity. CVSS v3 base score is 5.4 out of 10.