CVE-2021-42979: Nomachine Cloud Server

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

NoMachine Cloud Server is affected by Integer Overflow. IOCTL Handler 0x22001B in the NoMachine Cloud 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 Cloud Server: after 4.0.346, before 7.7.4 (fixed in 7.7.4)

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