The w3svc.dll ISAPI filter in Front Page Server Extensions and ASP.NET for Internet Information Server (IIS) 4.0, 5.0, and 5.1 does not properly handle the error condition when a long URL is provided, which allows remote attackers to cause a denial of service (crash) when the URL parser accesses a null pointer.
| Software | From | Fixed in |
|---|---|---|
| microsoft / internet_information_services | 5.0 | 5.0.x |
| microsoft / internet_information_server | 4.0 | 4.0.x |