CVE-2021-42979

Name of the Vulnerable Software and Affected Versions NoMachine Cloud 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, resulting in memory corruption and OS crash, via specially crafted I/O Request Packet. This is due to an Integer Overflow in the IOCTL Handler 0x22001B.

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