Reverse Osmosis System PLC Attacked

Event Year: 2002 Reliability: Likely But Unconfirmed
Country: United States
Industry Type: Electronic Manufacturing

A PLC operating a reverse osmosis system for water purification in a semiconductor manufacturing plant was attacked and disabled by unknown Internet hackers. The PLC was improperly protected as it was connected to a LAN directly accessable to the Internet


Loss of the reverse osmosis water system for several hours, but no economic loss as there was sufficient backup water.

Action Description: PLC was moved to a firewall protected LAN