CVE-2019-20104

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

The OpenID client application in Atlassian Crowd before version 3.6.2, and from version 3.7.0 before 3.7.1 allows remote attackers to perform a Denial of Service attack via an XML Entity Expansion vulnerability.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-776

Affected software

Vendor	Product	Versions
Atlassian	Crowd	>= unspecified, < 3.6.2; >= 3.7.0, < unspecified; >= unspecified, < 3.7.1

References

https://jira.atlassian.com/browse/CWD-5526Vendor Advisory
https://zeroauth.ltd/blog/2020/02/07/cve-2019-20104-atlassian-crowd-openid-client-vulnerable-to-remote-dos-via-xml-entity-expansion/Exploit, Technical Description
https://jira.atlassian.com/browse/CWD-5526Vendor Advisory
https://zeroauth.ltd/blog/2020/02/07/cve-2019-20104-atlassian-crowd-openid-client-vulnerable-to-remote-dos-via-xml-entity-expansion/Exploit, Technical Description

Timeline

Published: Feb 6, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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