What’s Vulnerable › Vulnerabilities

CVE-2025-34287: Nagios XI < 2024R2 Privilege Escalation via process_perfdata.pl

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-30 · updated 2026-10-07
• Weakness: CWE-732

Description

Nagios XI versions prior to 2024R2 contain an improperly owned script, process_perfdata.pl, which is executed periodically as the nagios user but owned by www-data. Because the file was writable by www-data, an attacker with web server privileges could modify its contents, leading to arbitrary code execution as the nagios user when the script is next run. This improper ownership and permission configuration enables local privilege escalation.

Affected products

• Nagios XI: before 2024; 2024-r1, 2024-r1.0.1, 2024-r1.0.2, 2024-r1.1, 2024-r1.1.1, 2024-r1.1.2 (+16) — fixed in 2024

How to fix

Upgrade to a fixed version: Nagios XI 2024. Check the vendor advisory for mitigations.

References

• https://www.nagios.com/changelog/nagios-xi/
• https://www.vulncheck.com/advisories/nagios-xi-privilege-escalation-via-improperly-owned-script

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