HIGH
CVE-2019-20104
CWE-776Published: February 6, 2020· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official 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.
Technical Analysis
CVE-2019-20104 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
Atlassian1 product(s)
crowd
Source: NVD CPE · 1 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (4)
→
https://jira.atlassian.com/browse/CWD-5526Vendor Advisory
→
→
https://jira.atlassian.com/browse/CWD-5526Vendor Advisory
Quick Facts
CVE IDCVE-2019-20104
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-776
CISA KEVNo
Affected1 vendor(s)
PublishedFeb 6, 2020
Related CVEs (CWE-776)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2019-20104 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.