Denial of service in Windows NT messenger service through a long username.
| Name | Vendor | Start Version | End Version | 
|---|---|---|---|
| Windows_nt | Microsoft | 4.0 (including) | 4.0 (including) | 
| Windows_nt | Microsoft | 4.0-sp1 (including) | 4.0-sp1 (including) | 
| Windows_nt | Microsoft | 4.0-sp2 (including) | 4.0-sp2 (including) | 
| Windows_nt | Microsoft | 4.0-sp3 (including) | 4.0-sp3 (including) | 
| Windows_nt | Microsoft | 4.0-sp4 (including) | 4.0-sp4 (including) | 
| Windows_nt | Microsoft | 4.0-sp5 (including) | 4.0-sp5 (including) |