What’s Vulnerable › Vulnerabilities

CVE-2021-25929

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-20 · updated 2026-06-17
• Weakness: CWE-79

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 Stored Cross-Site Scripting since there is no validation on the input being sent to the `name` parameter in `noticeWizard` endpoint. Due to this flaw an authenticated attacker could inject arbitrary script and trick other admin users into downloading malicious files.

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/66c1f626bf38a7d1a9530b4d68598269ee5245a2
• https://github.com/OpenNMS/opennms/commit/eb08b5ed4c5548f3e941a1f0d0363ae4439fa98c
• https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25929
• https://github.com/OpenNMS/opennms/commit/66c1f626bf38a7d1a9530b4d68598269ee5245a2
• https://github.com/OpenNMS/opennms/commit/eb08b5ed4c5548f3e941a1f0d0363ae4439fa98c
• https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25929

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