What is CVE-2021-31727?

CVE-2021-31727 is a high-severity vulnerability in Malwarefox Antimalware. CVSS score: 7.8/10. Published 2021-05-17.

How severe is CVE-2021-31727?

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

Is CVE-2021-31727 known to be exploited?

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

Vulnerability in Malwarefox Antimalware

CVE-2021-31727

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.

EPSS: 0.004 (29.7th 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-2021-31727?: CVE-2021-31727 is a high-severity vulnerability in Malwarefox Antimalware. CVSS score: 7.8/10. Published 2021-05-17.
How severe is CVE-2021-31727?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2021-31727 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.