Worms replicate over a network using protocols. The latest incarnation of worms make use of known vulnerabilities in systems to penetrate, execute their code, and replicate to other systems such as the Code Red II worm that infected more than 259 000 systems in less than 14 hours.[22] On a much larger scale, worms can be designed for industrial espionage to monitor and collect server and traffic activities then transmit it back to its creator.