That may be a problem. Increasingly, carmakers are coming out with vehicles that include Wi-Fi routers for Internet connectivity, Gragg said.
"Of the 21,000 vehicles stolen in London in 2013, it is estimated 47% were subjected to some form of electronic hacking," the PT&C|LWG report states. "The majority of these hacks involved using electronic devices to fool the vehicle's security systems into believing a key was present."
Gragg said that "in the wild," the vehicles on the most-hackable list have yet to be compromised. The results of the study were based on attempts by engineers and white-hat hackers.
"In more advanced vehicles -- the ones that have infotainment systems -- wireless security and wireless access points are all connected into the navigation system. So those are more susceptible to hacking because there are just more wireless access points," Gragg said. "Anything open to wireless capabilities is susceptible to the hacking."
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