What is CVE-2019-5464?

CVE-2019-5464 is a critical-severity vulnerability in GitLab, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2020-01-28.

How severe is CVE-2019-5464?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2019-5464 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

SSRF in GitLab

CVE-2019-5464

A flawed DNS rebinding protection issue was discovered in GitLab CE/EE 10.2 and later in the `url_blocker.rb` which could result in SSRF where the library is utilized.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2020-01-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.028 (86.0th percentile), scored 2026-10-06.

Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.028 · newest: 0.028 · change: 0.000

Affected products

GitLab
GitLab Ce/ee — versions Affects GitLab CE/EE 10.2 and later, Fixed in 12.1.2 in 12.0.4 and in 11.11.6

Weakness classification (CWE)

Public proof-of-concept exploits

References

about.gitlab.com/releases/2019/07/29/security-release-gitlab-12-dot-1-dot-2-rel… (Patch, Release Notes, Vendor Advisory)
hackerone.com/reports/632101 (Permissions Required)
gitlab.com/gitlab-org/gitlab-ce/issues/63959 (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2019-5464?: CVE-2019-5464 is a critical-severity vulnerability in GitLab, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2020-01-28.
How severe is CVE-2019-5464?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2019-5464 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.