CVE-2020-12760

Name: CVE-2020-12760
Creator: NVD / NIST
Published: 2020-05-11T16:15:13.147+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 3.41%

Last modified Jun 17, 2026

CVE-2020-12760 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 3.41% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.41%

87.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-502

Affected Software

Vendor	Product	Versions
Opennms	Opennms Horizon	< 26.1.0
Opennms	Opennms Meridian	< 2018.1.19
Opennms	Opennms Meridian	>= 2019, < 2019.1.7

References

https://github.com/OpenNMS/opennms/releases/tag/opennms-26.0.1-1Release Notes
https://issues.opennms.org/browse/NMS-12673Vendor Advisory
https://www.opennms.com/en/blog/2020-04-29-opennms-horizon-26-0-1-luchador-released/Release Notes, Vendor Advisory
https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2018-1-18-wildfire-released/Release Notes, Vendor Advisory
https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2019-1-6-europa-released/Release Notes, Vendor Advisory
https://github.com/OpenNMS/opennms/releases/tag/opennms-26.0.1-1Release Notes
https://issues.opennms.org/browse/NMS-12673Vendor Advisory
https://www.opennms.com/en/blog/2020-04-29-opennms-horizon-26-0-1-luchador-released/Release Notes, Vendor Advisory
https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2018-1-18-wildfire-released/Release Notes, Vendor Advisory
https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2019-1-6-europa-released/Release Notes, Vendor Advisory

Timeline

Published: May 11, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-12760?

How severe is CVE-2020-12760?

CVE-2020-12760 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 3.41% probability of exploitation in the next 30 days.

How do I fix CVE-2020-12760?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-12760?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST