CVE-2020-36239

Name: CVE-2020-36239
Creator: NVD / NIST
Published: 2021-07-29T11:15:07.477+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 48.88%

Last modified Jun 17, 2026

CVE-2020-36239 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Jira Data Center, Jira Core Data Center, Jira Software Data Center from version 6.3.0 before 8.5.16, from 8.6.0 before 8.13.8, from 8.14.0 before 8.17.0 and Jira Service Management Data Center from version 2.0.2 before 4.5.16, from version 4.6.0 before 4.13.8, and from version 4.14.0 before 4.17.0 exposed a Ehcache RMI network service which attackers, who can connect to the service, on port 40001 and potentially 40011[0][1], could execute arbitrary code of their choice in Jira through deserialization due to a missing authentication vulnerability. While Atlassian strongly suggests restricting access to the Ehcache ports to only Data Center instances, fixed versions of Jira will now require a shared secret in order to allow access to the Ehcache service. EPSS estimates a 48.88% chance of exploitation in the next 30 days.

Description

Jira Data Center, Jira Core Data Center, Jira Software Data Center from version 6.3.0 before 8.5.16, from 8.6.0 before 8.13.8, from 8.14.0 before 8.17.0 and Jira Service Management Data Center from version 2.0.2 before 4.5.16, from version 4.6.0 before 4.13.8, and from version 4.14.0 before 4.17.0 exposed a Ehcache RMI network service which attackers, who can connect to the service, on port 40001 and potentially 40011[0][1], could execute arbitrary code of their choice in Jira through deserialization due to a missing authentication vulnerability. While Atlassian strongly suggests restricting access to the Ehcache ports to only Data Center instances, fixed versions of Jira will now require a shared secret in order to allow access to the Ehcache service. [0] In Jira Data Center, Jira Core Data Center, and Jira Software Data Center versions prior to 7.13.1, the Ehcache object port can be randomly allocated. [1] In Jira Service Management Data Center versions prior to 3.16.1, the Ehcache object port can be randomly allocated.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

48.88%

98.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Atlassian	Jira Data Center	>= 6.3.0, < 8.5.16
Atlassian	Jira Data Center	>= 8.6.0, < 8.13.8
Atlassian	Jira Data Center	>= 8.14.0, < 8.17.0
Atlassian	Jira Service Desk	>= 2.0.2, < 4.5.16
Atlassian	Jira Service Desk	>= 4.6.0, < 4.13.8
Atlassian	Jira Service Management	>= 4.14.0, < 4.17.0

References

https://confluence.atlassian.com/adminjiraserver/jira-data-center-and-jira-service-management-data-center-security-advisory-2021-07-21-1063571388.htmlPatch, Vendor Advisory
https://jira.atlassian.com/browse/JRASERVER-72566Issue Tracking, Vendor Advisory
https://jira.atlassian.com/browse/JSDSERVER-8454Issue Tracking, Vendor Advisory
https://confluence.atlassian.com/adminjiraserver/jira-data-center-and-jira-service-management-data-center-security-advisory-2021-07-21-1063571388.htmlPatch, Vendor Advisory
https://jira.atlassian.com/browse/JRASERVER-72566Issue Tracking, Vendor Advisory
https://jira.atlassian.com/browse/JSDSERVER-8454Issue Tracking, Vendor Advisory

Timeline

Published: Jul 29, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-36239?

How severe is CVE-2020-36239?

CVE-2020-36239 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 48.88% probability of exploitation in the next 30 days.

How do I fix CVE-2020-36239?

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-2020-36239?

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

Scan your code now

Source: NVD / NIST