CVE-2020-28900: Nagios Fusion

Critical severity, CVSS 9.8. EPSS: 3.1% chance of exploitation in the next 30 days.

Insufficient Verification of Data Authenticity in Nagios Fusion 4.1.8 and earlier and Nagios XI 5.7.5 and earlier allows for Escalation of Privileges or Code Execution as root via vectors related to an untrusted update package to upgrade_to_latest.sh.

Affected products

• Nagios Fusion: up to and including 4.1.8
• Nagios Nagios XI: up to and including 5.7.5

Published 2021-05-24. Last modified 2026-06-17.