How severe is CVE-2021-39128?

CVE-2021-39128 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-39128 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39128?

CVE-2021-39128 primarily affects Atlassian Jira Data Center. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-39128?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-39128 published?

CVE-2021-39128 was published on 2021-09-16 and last updated on 2026-06-17.

CVE-2021-39128

CVE-2021-39128 is a high-severity vulnerability in Atlassian Jira Data Center with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 6.5
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Atlassian Jira Data Center
Published: 2021-09-16
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-39128?: 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.
How severe is CVE-2021-39128?: CVE-2021-39128 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-39128 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39128?: CVE-2021-39128 primarily affects Atlassian Jira Data Center. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-39128?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-39128 published?: CVE-2021-39128 was published on 2021-09-16 and last updated on 2026-06-17.

References

https://jira.atlassian.com/browse/JRASERVER-72804

Affected products (2)

cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*

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