How severe is CVE-2019-20400?

CVE-2019-20400 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-20400 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-20400?

CVE-2019-20400 affects Atlassian Jira Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-20400?

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-2019-20400 published?

CVE-2019-20400 was published on 2020-02-06 and last updated on 2026-06-17.

CVE-2019-20400

CVE-2019-20400 is a high-severity vulnerability in Atlassian Jira Server with a CVSS 3.x base score of 7.8. 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-427.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.4
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-427
Affected product: Atlassian Jira Server
Published: 2020-02-06
Last modified: 2026-06-17

Description

The usage of Tomcat in Jira before version 8.5.2 allows local attackers with permission to write a dll file to a directory in the global path environmental variable can inject code into via a DLL hijacking vulnerability.

Frequently asked questions

What is CVE-2019-20400?: The usage of Tomcat in Jira before version 8.5.2 allows local attackers with permission to write a dll file to a directory in the global path environmental variable can inject code into via a DLL hijacking vulnerability.
How severe is CVE-2019-20400?: CVE-2019-20400 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-20400 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-20400?: CVE-2019-20400 affects Atlassian Jira Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-20400?: 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-2019-20400 published?: CVE-2019-20400 was published on 2020-02-06 and last updated on 2026-06-17.

References

https://jira.atlassian.com/browse/JRASERVER-70407

Affected products (1)

cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*

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