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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (28.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Malwarefox Antimalware — versions 2.74.0.150
Public proof-of-concept exploits
References
- github.com/irql0/CVE-2021-31728/blob/master/CVE-2021-31727.md (Third Party Advisory)
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.