What’s Vulnerable › Vulnerabilities

CVE-2020-12760

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-05-11 · updated 2026-06-17
• Weakness: CWE-502

Description

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 products

• Opennms Horizon: before 26.1.0 — fixed in 26.1.0
• Opennms Meridian: before 2018.1.19; from 2019 before 2019.1.7 — fixed in 2018.1.19, 2019.1.7

How to fix

Upgrade to a fixed version: Opennms Horizon 26.1.0; Opennms Meridian 2018.1.19, 2019.1.7. Check the vendor advisory for mitigations.

References

• 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/
• 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/

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