CVE-2021-39943

Name: CVE-2021-39943
Creator: NVD / NIST
Published: 2022-02-09T23:15:16.023+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.85%

Last modified Jun 17, 2026

CVE-2021-39943 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. An authorization logic error in the External Status Check API in GitLab EE affecting all versions starting from 14.1 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2, allowed a user to update the status of the check via an API call. EPSS estimates a 0.85% chance of exploitation in the next 30 days.

Description

An authorization logic error in the External Status Check API in GitLab EE affecting all versions starting from 14.1 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2, allowed a user to update the status of the check via an API call

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

0.85%

53.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Gitlab	Gitlab	>= 14.1.0, < 14.3.6
Gitlab	Gitlab	>= 14.4.0, < 14.4.4
Gitlab	Gitlab	>= 14.5.0, < 14.5.2

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39943.jsonVendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/343604Broken Link
https://hackerone.com/reports/1375393Permissions Required, Third Party Advisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39943.jsonVendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/343604Broken Link
https://hackerone.com/reports/1375393Permissions Required, Third Party Advisory

Timeline

Published: Feb 9, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39943?

How severe is CVE-2021-39943?

CVE-2021-39943 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.85% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39943?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-39943?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST