A system for preventing an attack on a networked vehicle via a wireless communication device including a wireless data traffic network, a security status determination unit for controlling access to the wireless network depending on a security status based on evaluation of a configuration and/or on log data of the vehicle and/or on time that has passed since a software update, and a communication device and an access control device. A method for preventing an attack on a networked vehicle via a wireless communication device, where a security status is determined based on an evaluation of a current configuration of the vehicle and/or on log data of the vehicle and/or on time that has passed since an update of relevant software a network access rule set is determined and actuated for the access to the data traffic network based on the determined security status.