Code Red was a computer worm that exploited one of the earliest notorious Microsoft vulnerabilities, a buffer overflow in Microsoft IIS. It is credited as the first large scale mixed threat attack against enterprise networks. Code Red was released July 13, 2001, although its first observation happened two days later, on July 15, 2001. Infections peaked July 19, 2001, infecting 359,000 servers worldwide.
Code Red worm, July 13, 2001










