CVE-2019-20899

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-07-13 · updated 2026-06-17

Description

The Gadget API in Atlassian Jira Server and Data Center in affected versions allows remote attackers to make Jira unresponsive via repeated requests to a certain endpoint in the Gadget API. The affected versions are before version 8.5.4, and from version 8.6.0 before 8.6.1.

Affected products

Atlassian Jira: before 8.5.4 — fixed in 8.5.4
Atlassian Jira: from 8.5.5 before 8.6.1; from 8.6.2 before 8.7.0 — fixed in 8.6.1, 8.7.0
Atlassian Jira: from 8.5.5 before 8.6.1; from 8.6.2 before 8.7.0 — fixed in 8.6.1, 8.7.0
Atlassian Jira Software Data Center: before 8.5.4 — fixed in 8.5.4

How to fix

Upgrade to a fixed version: Atlassian Jira 8.5.4; Atlassian Jira 8.6.1, 8.7.0; Atlassian Jira 8.6.1, 8.7.0; Atlassian Jira Software Data Center 8.5.4. Check the vendor advisory for mitigations.

References

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