Is CVE-2021-39128 actively exploited?

No active exploitation of CVE-2021-39128 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-39128 be exploited remotely?

Yes. CVE-2021-39128 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-39128?

CVE-2021-39128 has a CVSS score of 7.2 (HIGH).

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HIGH

CVE-2021-39128

CWE-1336Published: September 16, 2021· Updated: Jun 17, 2026

7.2

CVSS v3.1

Official Description

Affected versions of Atlassian Jira Server or Data Center using the Jira Service Management addon allow remote attackers with JIRA Administrators access to execute arbitrary Java code via a server-side template injection vulnerability in the Email Template feature. The affected versions of Jira Server or Data Center are before version 8.13.12, and from version 8.14.0 before 8.19.1.

NVD Source

Technical Analysis

CVE-2021-39128 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.2.