Code Red and its two variants use a security hole in Microsoft's flagship Web server--the Internet Information Server--to spread to computers that don't have the vulnerability patched.

Code rot leads to under-performing enterprise systems. In today's device-laden edge world, it can be devastating. Another issue lurking: inaccurate AI algorithms.

Worm? Trojan? Attack tool? Network administrators and security experts search for the cause of an increasing amount of odd data that has been detected on the Internet.