Is CVE-2021-39123 actively exploited?

No active exploitation of CVE-2021-39123 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-39123 be exploited remotely?

Yes. CVE-2021-39123 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-39123?

CVE-2021-39123 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2021-39123

NVD-CWE-noinfoPublished: September 14, 2021· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-39123 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.