Modems play an important role in enabling connectivity for a wide range of devices. This includes not only traditional mobile devices and household appliances, but also telecommunication systems in vehicles, ATMs and Automated Process Control Systems (APCS).
When integrating the modem, many product developers do not think of protecting their device from a potential modem compromise. As one of the main communication channels for the end device, the modem not only has access to the information flow between the device and the outside world, but also may have almost unlimited access to the most critical systems and resources of the end device. Thus, modem security is a significant matter.
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Source: Kaspersky
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