OpenNMS Horizon RCE via Unsafe Deserialization
An issue was discovered in OpenNMS Horizon before 26.0.1, and Meridian before 2018.1.19 and 2019 before 2019.1.7. The ActiveMQ channel configuration allowed for arbitrary deserialization of Java objects (aka ActiveMQ Minion payload deserialization), leading to remote code execution for any authenticated channel user regardless of its assigned permissions.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.opennms.core:org.opennms.core.daemon | < 26.0.1 | 26.0.1 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2020-12760
- https://github.com/OpenNMS/opennms/pull/2983
- https://github.com/OpenNMS/opennms/commit/e21fc14ce355533493da0db815bd81a66e291382
- https://github.com/OpenNMS/opennms
- https://github.com/OpenNMS/opennms/releases/tag/opennms-26.0.1-1
- https://issues.opennms.org/browse/NMS-12673
- https://www.opennms.com/en/blog/2020-04-29-opennms-horizon-26-0-1-luchador-released
- https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2018-1-18-wildfire-released
- https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2019-1-6-europa-released
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-502- Platform
- Java / Kotlin (Maven)
- Package
org.opennms.core:org.opennms.core.daemon- Disclosed
- 24.05.2022
- Updated
- 11.10.2026 11:21
Sources and licenses
OSV / GitHub Advisory Database - GHSA-853f-x27w-8r74 - CC BY 4.0
Vulnerability history: org.opennms.core:org.opennms.core.daemon
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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