High severity7.8NVD Advisory· Published May 17, 2021· Updated Jun 17, 2026
CVE-2021-31728
CVE-2021-31728
Description
Incorrect access control in zam64.sys, zam32.sys in MalwareFox AntiMalware 2.74.0.150 allows a non-privileged process to open a handle to \.\ZemanaAntiMalware, register itself with the driver by sending IOCTL 0x80002010, allocate executable memory using a flaw in IOCTL 0x80002040, install a hook with IOCTL 0x80002044 and execute the executable memory using this hook with IOCTL 0x80002014 or 0x80002018, this exposes ring 0 code execution in the context of the driver allowing the non-privileged process to elevate privileges.
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Affected products
3cpe:2.3:a:malwarefox:antimalware:2.74.0.150:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:malwarefox:antimalware:2.74.0.150:*:*:*:*:*:*:*
- (no CPE)range: = 2.74.0.150
- MalwareFox/AntiMalwaredescription
Patches
Vulnerability mechanics
References
1- github.com/irql0/CVE-2021-31728/blob/master/CVE-2021-31728.mdnvdThird Party Advisory
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