What is CVE-2021-31728?

CVE-2021-31728 is a high-severity vulnerability in Malwarefox Antimalware. CVSS score: 7.8/10. Published 2021-05-17.

How severe is CVE-2021-31728?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2021-31728 known to be exploited?

14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Malwarefox Antimalware

CVE-2021-31728

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.

EPSS: 0.034 (87.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Malwarefox Antimalware — versions 2.74.0.150
N/a — versions n/a

Public proof-of-concept exploits

References

cve@mitre.org (Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-31728?: CVE-2021-31728 is a high-severity vulnerability in Malwarefox Antimalware. CVSS score: 7.8/10. Published 2021-05-17.
How severe is CVE-2021-31728?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2021-31728 known to be exploited?: 14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.