CVE-2025-66678: Faintsnow Hardware Read & Write Utility

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

An issue in the HwRwDrv.sys component of Nil Hardware Editor Hardware Read & Write Utility v1.25.11.26 and earlier allows attackers to execute arbitrary read and write operations via a crafted request.

Affected products

• Faintsnow Hardware Read & Write Utility: up to and including 1.25.11.26

Published 2026-03-04. Last modified 2026-06-17.