What’s Vulnerable › Vulnerabilities

CVE-2021-31728

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-17 · updated 2026-06-17

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.

Affected products

• Malwarefox Antimalware: 2.74.0.150

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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