Public proof of conceptFix available

CVE-2021-39115

Q: Is CVE-2021-39115 actively exploited?

Active exploitation of CVE-2021-39115 has not been confirmed. Its EPSS score was 4.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-39115?

CVE-2021-39115 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2021-09-01
Fixed in4.13.9
WeaknessCWE-94 · CWE-96

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Affected versions of Atlassian Jira Service Management Server and Data Center allow remote attackers with "Jira Administrators" access to execute arbitrary Java code or run arbitrary system commands via a Server_Side Template Injection vulnerability in the Email Template feature. The affected versions are before version 4.13.9, and from version 4.14.0 before 4.18.0.

Timeline

dates in UTC

2021-09-0123:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-39115?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-39115?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · CISA-ADP

Atlassian jira service desk

Branch	Affected	Fixed in	Source
4.13	< 4.13.9	4.13.9	NVD · CISA-ADP

Atlassian jira service management

Branch	Affected	Fixed in	Source
4.x	≥ 4.14.0, < 4.18.0	4.18.0	NVD · CISA-ADP

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Atlassian jira service desk to 4.13.9

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedPetrusViet/CVE-2021-39115

Sources

CISA-ADPSSVC decisionnone2024-10-11
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.17.22024-10-11
NVDCVSS 3.17.2read 2026-10-23
NVDCVSS 2.09read 2026-10-23
CNAweakness (CWE)CWE-96read 2026-10-23
NVDweakness (CWE)CWE-94read 2026-10-23
FIRST EPSSEPSS score4.5 %2026-10-23
PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Published: 2021-09-01
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-39115?

Is CVE-2021-39115 actively exploited?

Active exploitation of CVE-2021-39115 has not been confirmed. Its EPSS score was 4.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-39115?

CVE-2021-39115 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

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