How severe is CVE-2019-20406?

CVE-2019-20406 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-2019-20406 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-20406?

CVE-2019-20406 primarily affects Atlassian Confluence. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-20406?

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-2019-20406 published?

CVE-2019-20406 was published on 2020-02-06 and last updated on 2026-06-17.

CVE-2019-20406

CVE-2019-20406 is a high-severity vulnerability in Atlassian Confluence 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% (38th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-427
Affected product: Atlassian Confluence
Published: 2020-02-06
Last modified: 2026-06-17

Description

The usage of Tomcat in Confluence on the Microsoft Windows operating system before version 7.0.5, and from version 7.1.0 before version 7.1.1 allows local system attackers who have permission to write a DLL file in a directory in the global path environmental variable variable to inject code & escalate their privileges via a DLL hijacking vulnerability.

Frequently asked questions

What is CVE-2019-20406?: The usage of Tomcat in Confluence on the Microsoft Windows operating system before version 7.0.5, and from version 7.1.0 before version 7.1.1 allows local system attackers who have permission to write a DLL file in a directory in the global path environmental variable variable to inject code & escalate their privileges via a DLL hijacking vulnerability.
How severe is CVE-2019-20406?: CVE-2019-20406 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-2019-20406 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-20406?: CVE-2019-20406 primarily affects Atlassian Confluence. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-20406?: 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-2019-20406 published?: CVE-2019-20406 was published on 2020-02-06 and last updated on 2026-06-17.

References

https://jira.atlassian.com/browse/CONFSERVER-59428

Affected products (2)

cpe:2.3:a:atlassian:confluence:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:7.1.0:*:*:*:*:*:*:*

More vulnerabilities in Atlassian Confluence

CVE-2019-3395 — Critical (CVSS 9.8): The WebDAV endpoint in Atlassian Confluence Server and Data Center before version 6.6.7 (the fixed version for 6.6.x),…
CVE-2012-2926 — Critical (CVSS 9.1): Atlassian JIRA before 5.0.1; Confluence before 3.5.16, 4.0 before 4.0.7, and 4.1 before 4.1.10; FishEye and Crucible…
CVE-2019-3394 — High (CVSS 8.8): There was a local file disclosure vulnerability in Confluence Server and Confluence Data Center via page exporting. An…
CVE-2019-15006 — Medium (CVSS 6.5): There was a man-in-the-middle (MITM) vulnerability present in the Confluence Previews plugin in Confluence Server and…
CVE-2017-18086 — Medium (CVSS 6.1): Various resources in Atlassian Confluence Server before version 6.4.2 allow remote attackers to inject arbitrary HTML…
CVE-2017-18085 — Medium (CVSS 6.1): The viewdefaultdecorator resource in Atlassian Confluence Server before version 6.6.1 allows remote attackers to inject…

All CVEs affecting Atlassian Confluence →

Other CWE-427 (Uncontrolled Search Path Element) vulnerabilities

CVE-2025-4981 — Critical (CVSS 9.9): Mattermost versions 10.5.x <= 10.5.5, 9.11.x <= 9.11.15, 10.8.x <= 10.8.0, 10.7.x <= 10.7.2, 10.6.x <= 10.6.5 fail to…
CVE-2025-69599 — Critical (CVSS 9.8): RayVentory Scan Engine through 12.6 Update 8 allows attackers to gain privileges if they control the value of the PATH…
CVE-2019-25268 — Critical (CVSS 9.8): NREL BEopt 2.8.0.0 contains a DLL hijacking vulnerability that allows attackers to load arbitrary libraries by tricking…
CVE-2023-53959 — Critical (CVSS 9.8): FileZilla Client 3.63.1 contains a DLL hijacking vulnerability that allows attackers to execute malicious code by…
CVE-2025-65741 — Critical (CVSS 9.8): Sublime Text 3 Build 3208 or prior for MacOS is vulnerable to Dylib Injection. An attacker could compile a .dylib file…
CVE-2024-23054 — Critical (CVSS 9.8): An issue in Plone Docker Official Image 5.2.13 (5221) open-source software that could allow for remote code execution…

Browse all CWE-427 (Uncontrolled Search Path Element) vulnerabilities →