CVE-2025-34287: nagios xi Permission Flaw (CVSS 7.8)

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-732 CWE-732

Affected Products

Vendor	Product	Versions
nagios	nagios_xi	< 2024
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All
nagios	nagios_xi	All

References

Other References

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

Frequently Asked Questions

What is CVE-2025-34287? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-34287? +

CVE-2025-34287 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-34287? +

CVE-2025-34287 affects products from nagios, specifically: nagios_xi. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-34287? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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