High severity7.8NVD Advisory· Published May 17, 2021· Updated Jun 17, 2026
CVE-2021-31727
CVE-2021-31727
Description
Incorrect access control in zam64.sys, zam32.sys in MalwareFox AntiMalware 2.74.0.150 where IOCTL's 0x80002014, 0x80002018 expose unrestricted disk read/write capabilities respectively. A non-privileged process can open a handle to \.\ZemanaAntiMalware, register with the driver using IOCTL 0x80002010 and send these IOCTL's to escalate privileges by overwriting the boot sector or overwriting critical code in the pagefile.
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LLM-synthesized narrative grounded in this CVE's description and references.
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-2021-31727.mdnvdThird Party Advisory
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