CVE-2021-31728

7.8 highEPSS 3.4%

High (7.8) in malwarefox antimalware. EPSS 3.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

7.8 high

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 3.4% chance of exploitation in the next 30 days; higher than 88% of CVEs (scores of 2026-10-31)
Published: 2021-05-17
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

malwarefox:antimalware

References

https://github.com/irql0/CVE-2021-31728/blob/master/CVE-2021-31728.md
https://github.com/irql0/CVE-2021-31728/blob/master/CVE-2021-31728.md

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