In the attacks, a highly sophisticated form of malicious software, dubbed SYNful Knock, has been implanted in routers made by Cisco, the world’s top supplier, U.S. security research firm FireEye said on Tuesday. “If you own (seize control of) the router, you own the data of all the companies and government organizations that sit behind that router,” FireEye Chief Executive Dave DeWalt told Reuters of his company’s discovery. Cisco confirmed it had alerted customers to the attacks in August and said they were not due to any vulnerability in its own software.