CVE-2021-42972: Nomachine Server

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

NoMachine Server is affected by Buffer Overflow. IOCTL Handler 0x22001B in the NoMachine Server above 4.0.346 and below 7.7.4 allow local attackers to execute arbitrary code in kernel mode or cause a denial of service (memory corruption and OS crash) via specially crafted I/O Request Packet.

Affected products

• Nomachine Server: after 4.0.346, before 7.7.4 (fixed in 7.7.4)

Published 2021-12-07. Last modified 2026-06-17.