CVE-2019-7240: MOO0 System Monitor

High severity, CVSS 7.2. EPSS: 2.4% chance of exploitation in the next 30 days.

An issue was discovered in WinRing0x64.sys in Moo0 System Monitor 1.83. The vulnerable driver exposes a wrmsr instruction via IOCTL 0x9C402088 and does not properly filter the Model Specific Register (MSR). Allowing arbitrary MSR writes can lead to Ring-0 code execution and escalation of privileges.

Affected products

• MOO0 System Monitor: version 1.83 only

Published 2020-03-25. Last modified 2026-06-17.