VULNERABILITY INTELLIGENCE

CVE-2021-31727

CVSS score7.8 HIGH

EPSS probability0.37%

CISA KEVNot currently listed

Published2021-05-17

Last modified2026-06-17

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.