What is CVE-2019-20418?

CVE-2019-20418 is a medium-severity vulnerability in Atlassian Jira. CVSS score: 6.5/10. Published 2020-07-03.

How severe is CVE-2019-20418?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Atlassian Jira

CVE-2019-20418

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to prevent users from accessing the instance via an Application Denial of Service vulnerability in the /rendering/wiki endpoint. The affected versions are before version 8.8.0.

Published 2020-07-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (63.6th percentile), scored 2026-11-01.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Atlassian Jira
Atlassian Jira Server — versions unspecified
Atlassian Jira Software Data Center

References

jira.atlassian.com/browse/JRASERVER-70943 (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2019-20418?: CVE-2019-20418 is a medium-severity vulnerability in Atlassian Jira. CVSS score: 6.5/10. Published 2020-07-03.
How severe is CVE-2019-20418?: Medium severity. CVSS v3 base score is 6.5 out of 10.