Retailers, banks, government agencies -- anyone who wants to protect their assets and customers regularly updates their cybersecurity to thwart potential attacks. But there's one area that till now has remained surprisingly vulnerable: implantable medical devices, such as pacemakers. In the next few years, millions of implanted devices: pacemakers, insulin pumps, brain neurostimulators -- will rely on connectivity for control and monitoring.

Engineers at the University of Arizona have developed a prototype pacemaker system that was able to catch 100 percent of mimicked malware attacks.