CVE-2021-39123

Name: CVE-2021-39123
Creator: NVD / NIST
Published: 2021-09-14T05:15:09.993+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.55%

Last modified Jun 17, 2026

CVE-2021-39123 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Affected versions of Atlassian Jira Server and Data Center allow unauthenticated remote attackers to impact the application's availability via a Denial of Service (DoS) vulnerability in the /rest/gadget/1.0/createdVsResolved/generate endpoint. The affected versions are before version 8.16.0.. EPSS estimates a 1.55% chance of exploitation in the next 30 days.

Description

Affected versions of Atlassian Jira Server and Data Center allow unauthenticated remote attackers to impact the application's availability via a Denial of Service (DoS) vulnerability in the /rest/gadget/1.0/createdVsResolved/generate endpoint. The affected versions are before version 8.16.0.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.55%

71.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Atlassian	Data Center	< 8.16.0
Atlassian	Jira	< 8.16.0

References

https://jira.atlassian.com/browse/JRASERVER-72237Third Party Advisory
https://jira.atlassian.com/browse/JRASERVER-72237Third Party Advisory

Timeline

Published: Sep 14, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39123?

How severe is CVE-2021-39123?

CVE-2021-39123 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.55% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39123?

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-2021-39123?

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

Scan your code now

Source: NVD / NIST