CVE-2020-36239: atlassian jira core data center Missing Authorization
Vulnerability summary
CVE-2020-36239 is a critical (CVSS 9.8) Missing Authorization vulnerability in atlassian jira core data center. EPSS estimates a 49.82% chance of exploitation in the next 30 days, higher than 98.9% of scored vulnerabilities.
Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 50% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Timeline
- 29-07-2021PublishedVulnerability first disclosed.
- 17-10-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 2 sources · 2 versions- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
49.82%
Chance of exploitation in the next 30 days
Percentile
99%
Versus all other CVEs
30-day change
No change 0.00 pp
From 49.82% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-862Missing AuthorizationThe product does not perform an authorization check when an actor attempts to access a resource or perform an action.
- CWE-306Missing Authentication for Critical FunctionalityThe product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Atlassian6 products
- jira core data center≥ 6.3.0, < unspecified | ≥ unspecified, < 8.5.16 | ≥ 8.6.0, < unspecified | ≥ unspecified, < 8.13.8 | ≥ 8.14.0, < unspecified | ≥ unspecified, < 8.17.0
- jira_data_center≥ 6.3.0, < unspecified | ≥ unspecified, < 8.5.16 | ≥ 8.6.0, < unspecified | ≥ unspecified, < 8.13.8 | ≥ 8.14.0, < unspecified | ≥ unspecified, < 8.17.0 | ≥ 6.3.0, < 8.5.16 | ≥ 8.6.0, < 8.13.8 | ≥ 8.14.0, < 8.17.0
- jira_service_desk≥ 2.0.2, < 4.5.16 | ≥ 4.6.0, < 4.13.8
- jira_service_management≥ 4.14.0, < 4.17.0
- jira service management data center≥ 2.0.2, < unspecified | ≥ unspecified, < 4.5.16 | ≥ 4.6.0, < unspecified | ≥ unspecified, < 4.13.8 | ≥ 4.14.0, < unspecified | ≥ unspecified, < 4.17.0
1 vendor · 6 products