CVE-2021-39121

Name: CVE-2021-39121
Creator: NVD / NIST
Published: 2021-09-08T02:15:06.737+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 1.10%

Last modified Jun 17, 2026

CVE-2021-39121 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Affected versions of Atlassian Jira Server and Data Center allow authenticated remote attackers to enumerate the keys of private Jira projects via an Information Disclosure vulnerability in the /rest/api/latest/projectvalidate/key endpoint. The affected versions are before version 8.5.18, from version 8.6.0 before 8.13.10, and from version 8.14.0 before 8.18.2.. EPSS estimates a 1.10% chance of exploitation in the next 30 days.

Description

Affected versions of Atlassian Jira Server and Data Center allow authenticated remote attackers to enumerate the keys of private Jira projects via an Information Disclosure vulnerability in the /rest/api/latest/projectvalidate/key endpoint. The affected versions are before version 8.5.18, from version 8.6.0 before 8.13.10, and from version 8.14.0 before 8.18.2.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

1.10%

61.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Atlassian	Data Center	< 8.5.18
Atlassian	Jira	< 8.5.18
Atlassian	Jira Data Center	>= 8.6.0, < 8.13.10
Atlassian	Jira Data Center	>= 8.14.0, < 8.18.2
Atlassian	Jira Server	>= 8.6.0, < 8.13.10
Atlassian	Jira Server	>= 8.14.0, < 8.18.2

References

https://jira.atlassian.com/browse/JRASERVER-72715Patch, Vendor Advisory
https://jira.atlassian.com/browse/JRASERVER-72715Patch, Vendor Advisory

Timeline

Published: Sep 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39121?

How severe is CVE-2021-39121?

CVE-2021-39121 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 1.10% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39121?

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-2021-39121?

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

Scan your code now

Source: NVD / NIST