CVE-2019-20104

Public Exploit

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 2.43% Top 20%
Vendor Advisory atlassian.com
Affected: Atlassian Crowd
Published at:
Updated at:

References

Link Tags
https://jira.atlassian.com/browse/CWD-5526 vendor advisory
https://zeroauth.ltd/blog/2020/02/07/cve-2019-20104-atlassian-crowd-openid-client-vulnerable-to-remote-dos-via-xml-entity-expansion/ technical description exploit

Frequently Asked Questions

What is the severity of CVE-2019-20104?
CVE-2019-20104 has been scored as a high severity vulnerability.
How to fix CVE-2019-20104?
To fix CVE-2019-20104, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-20104 being actively exploited in the wild?
It is possible that CVE-2019-20104 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2019-20104?
CVE-2019-20104 affects Atlassian Crowd.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.