What’s Vulnerable › Vulnerabilities

CVE-2021-33179

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 11.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-14 · updated 2026-06-17
• Weakness: CWE-79

Description

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 XI: before 5.8.4 — fixed in 5.8.4

How to fix

Upgrade to a fixed version: Nagios XI 5.8.4. Check the vendor advisory for mitigations.

References

• https://www.synopsys.com/blogs/software-security/cyrc-advisory-nagios-xi
• https://www.synopsys.com/blogs/software-security/cyrc-advisory-nagios-xi

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