CVE-2020-36239

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 49.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-07-29 · updated 2026-06-17
Weakness: CWE-862

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.

Affected products

Atlassian Jira: from 6.3.0 before 8.5.16; from 8.6.0 before 8.13.8; from 8.14.0 before 8.17.0 — fixed in 8.13.8, 8.17.0, 8.5.16
Atlassian Jira Service Desk Server: from 2.0.2 before 4.5.16; from 4.6.0 before 4.13.8 — fixed in 4.13.8, 4.5.16
Atlassian Jira Service Management: from 4.14.0 before 4.17.0 — fixed in 4.17.0

How to fix

Upgrade to a fixed version: Atlassian Jira 8.13.8, 8.17.0, 8.5.16; Atlassian Jira Service Desk Server 4.13.8, 4.5.16; Atlassian Jira Service Management 4.17.0. Check the vendor advisory for mitigations.

References

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