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.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Internet_information_services | Microsoft | 5.0 | 5.0 |
| Internet_information_server | Microsoft | 4.0 | 4.0 |