The term WinNuke refers to a remote denial-of-service attack (DoS) that affected the Microsoft Windows 95, Microsoft Windows NT and Microsoft Windows 3.1x operating systems.
The exploit sent a string of OOB (out of band) data to the target computer on TCP port 139 (NetBIOS), causing it to lock up and display a "blue screen of death", or BSoD. This did not cause any damage to, or change data on, the computer's hard disk, but any unsaved data would be lost.
