CVE-2019-20406

Privilege escalation via Tomcat DLL search path

Published Feb 6, 2020 · Updated Sep 16, 2024

DLL hijacking in Atlassian Confluence Data Center before 7.0.5 and 7.1.0 allows local users to execute code with elevated privileges. The bundled Tomcat service searches the global PATH for a DLL and loads an attacker-written library from a writable directory before a trusted copy. Exploitation requires local access, permission to place a DLL in a PATH directory, and user interaction that starts or restarts the service; successful loading executes the library in the service context.

CVSS severity7.8
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

DLL hijacking in Atlassian Confluence Data Center before 7.0.5 and 7.1.0 allows local users to execute code with elevated privileges. The bundled Tomcat service searches the global PATH for a DLL and loads an attacker-written library from a writable directory before a trusted copy. Exploitation requires local access, permission to place a DLL in a PATH directory, and user interaction that starts or restarts the service; successful loading executes the library in the service context.

The record

CVE
CVE-2019-20406
Published
Feb 6, 2020
Updated
Sep 16, 2024
Vendor
Atlassian
Product
Confluence Data Center
Classifications
CWE-427, T1574.001
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 6, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.1.0 <unspecified
  2. Affected versionversion=unspecified <7.0.5
  3. Affected versionversion=unspecified <7.1.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Atlassian · Confluence Data Centerversion=7.1.0 <unspecified; version=unspecified <7.0.5; version=unspecified <7.1.1

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.4NIST NVDAV:L/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-427Uncontrolled Search Path Element
T1574.001DLL Search Order Hijacking

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo