Nagios XI < 5.5.7 Privilege Escalation via MRTG Graphing Component

Advisories

severity: high
date: October 30, 2025
Affecting: XI < 5.5.7
CVE: CVE-2018-25123
CWE: CWE-250 Execution with Unnecessary Privileges
CVSS: 8.5
CVSS V4 Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References: Nagios XI Changelog
Credit: Daniel Sayk of Telekom Security
Description: Nagios XI versions prior to 5.5.7 contain a privilege escalation vulnerability in the MRTG graphing component. MRTG-related processes/scripts executed with excessive privileges, allowing a local attacker with limited system access to abuse file/command execution paths or writable resources to gain elevated privileges.