What’s Vulnerable › Vulnerabilities

CVE-2021-3273

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 7.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-25 · updated 2026-06-17
• Weakness: CWE-94

Description

Nagios XI below 5.7 is affected by code injection in the /nagiosxi/admin/graphtemplates.php component. To exploit this vulnerability, someone must have an admin user account in Nagios XI's web system.

Affected products

• Nagios XI: before 5.7 — fixed in 5.7

How to fix

Upgrade to a fixed version: Nagios XI 5.7. Check the vendor advisory for mitigations.

References

• https://gist.github.com/leommxj/93edce6f8572cefe79a3d7da4389374e
• https://www.nagios.com/downloads/nagios-xi/change-log/
• https://gist.github.com/leommxj/93edce6f8572cefe79a3d7da4389374e
• https://www.nagios.com/downloads/nagios-xi/change-log/

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