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CVE-2021-25931

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-20 · updated 2026-06-17
• Weakness: CWE-352

Description

In OpenNMS Horizon, versions opennms-1-0-stable through opennms-27.1.0-1; OpenNMS Meridian, versions meridian-foundation-2015.1.0-1 through meridian-foundation-2019.1.18-1; meridian-foundation-2020.1.0-1 through meridian-foundation-2020.1.6-1 are vulnerable to CSRF, due to no CSRF protection at `/opennms/admin/userGroupView/users/updateUser`. This flaw allows assigning `ROLE_ADMIN` security role to a normal user. Using this flaw, an attacker can trick the admin user to assign administrator privileges to a normal user by enticing him to click upon an attacker-controlled website.

Affected products

• The OpenNMS Group Horizon: from 1.0 before 27.1.1 — fixed in 27.1.1
• The OpenNMS Group Meridian: from 2015.1.0 before 2019.1.19; from 2020.1.0 before 2020.1.7 — fixed in 2019.1.19, 2020.1.7

How to fix

Upgrade to a fixed version: The OpenNMS Group Horizon 27.1.1; The OpenNMS Group Meridian 2019.1.19, 2020.1.7. Check the vendor advisory for mitigations.

References

• https://github.com/OpenNMS/opennms/commit/607151ea8f90212a3fb37c977fa57c7d58d26a84
• https://github.com/OpenNMS/opennms/commit/eb08b5ed4c5548f3e941a1f0d0363ae4439fa98c
• https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25931
• https://github.com/OpenNMS/opennms/commit/607151ea8f90212a3fb37c977fa57c7d58d26a84
• https://github.com/OpenNMS/opennms/commit/eb08b5ed4c5548f3e941a1f0d0363ae4439fa98c
• https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25931

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