Is CVE-2021-31728 actively exploited?

Yes. CVE-2021-31728 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-31728 be exploited remotely?

The attack vector of CVE-2021-31728 has not been classified yet.

What is the CVSS score of CVE-2021-31728?

CVE-2021-31728 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-31728

UNKNOWNCISA KEVIN THE WILD

CVE-2021-31728

Published: April 11, 2026

EPSS:22.13%probability of exploitation in 30 daysPercentile:95.8th

Official 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.

NVD Source

Technical Analysis

CVE-2021-31728 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-31728 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.