K7RKScan.sys in K7 Ultimate Security before 17.0.2019 allows local users to cause a denial of service (BSOD) because of a NULL pointer dereference.

In K7 Antivirus Premium 16.0.xxx through 16.0.0120; K7 Total Security 16.0.xxx through 16.0.0120; and K7 Ultimate Security 16.0.xxx through 16.0.0120, the module K7TSHlpr.dll improperly validates the administrative privileges of the user, allowing arbitrary registry writes in the K7AVOptn.dll module to facilitate escalation of privileges via inter-process communication with a service process.

In K7 Ultimate Security 16.0.0117, the module K7BKCExt.dll (aka the backup module) improperly validates the administrative privileges of the user, allowing an arbitrary file write via a symbolic link attack with file restoration functionality.