CVE-2021-33179: Nagios XI

Medium severity, CVSS 6.1. EPSS: 11.7% chance of exploitation in the next 30 days.

The general user interface in Nagios XI versions prior to 5.8.4 is vulnerable to authenticated reflected cross-site scripting. An authenticated victim, who accesses a specially crafted malicious URL, would unknowingly execute the attached payload.

Affected products

• Nagios Nagios XI: before 5.8.4 (fixed in 5.8.4)

Published 2021-10-14. Last modified 2026-06-17.