In the year of 1988, the first large-scale Internet computer security violation began in the evening of November 2, when a computer programmer named Robert Tappan Morris released a worm program into the Internet.
Due to this action done by Morris, thousands of computer present in Universities, government laboratory, and corporations brought down worldwide before it was tracked down and removed.
At that time, Morris discovered two bugs in Berkeley UNIX that made it possible to gain unauthorized access to computer machines all over the Internet.
Morris worked alone and wrote a self-replicating computer program called worm that would exploit these errors and replicate itself in seconds on every computer machine it could gain access to. He worked on the worm program for many days just to hide its tracking.