How severe is CVE-2019-20104?

CVE-2019-20104 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-20104 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-20104?

CVE-2019-20104 affects Atlassian Crowd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-20104?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-20104 published?

CVE-2019-20104 was published on 2020-02-06 and last updated on 2026-06-17.

CVE-2019-20104

CVE-2019-20104 is a high-severity vulnerability in Atlassian Crowd with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-776.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-776
Affected product: Atlassian Crowd
Published: 2020-02-06
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2019-20104?: 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.
How severe is CVE-2019-20104?: CVE-2019-20104 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-20104 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-20104?: CVE-2019-20104 affects Atlassian Crowd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-20104?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-20104 published?: CVE-2019-20104 was published on 2020-02-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*

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