CVE-2021-31727

7.8 highEPSS 0.4%

High (7.8) in malwarefox antimalware. EPSS 0.4% chance of exploitation in the next 30 days.

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.

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: 0.4% chance of exploitation in the next 30 days; higher than 31% of CVEs (scores of 2026-11-01)
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-2021-31727.md
https://github.com/irql0/CVE-2021-31728/blob/master/CVE-2021-31727.md

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