CVE-2021-42972

Name of the Vulnerable Software and Affected Versions NoMachine Server versions 4.0.346 through 7.7.4

Description The issue allows local attackers to execute arbitrary code in kernel mode or cause a denial of service, such as memory corruption and OS crash, via specially crafted I/O Request Packet. This is due to a Buffer Overflow in the IOCTL Handler 0x22001B.

Recommendations For NoMachine Server versions 4.0.346 through 7.7.4, update to version 7.7.4 or later to resolve the issue. As a temporary workaround, consider restricting access to the IOCTL Handler 0x22001B to minimize the risk of exploitation.