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.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5861
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-020
http://www.vupen.com/english/advisories/2009/1539
http://www.us-cert.gov/cas/techalerts/TA09-160A.html
http://www.securitytracker.com/id?1022358
http://www.securityfocus.com/bid/35232
http://www.attrition.org/pipermail/vim/2009-June/002192.html