A radio interface is any wireless communication path a device exposes, such as Wi-Fi, Bluetooth, NFC, or cellular connectivity. In security terms, it is part of the attack surface: code that parses packets, negotiates links, and hands data to the operating system or firmware can contain bugs that attackers can trigger remotely or at close range.
Radio interfaces matter because they can be reached without physical access and often operate before user-level protections fully engage. Real attacks may abuse malformed frames, pairing weaknesses, rogue access points, NFC relay techniques, or baseband and driver flaws. Defenders reduce risk by patching radio firmware and OS components, disabling unused radios, limiting discoverability, and enforcing mobile device management policies that restrict wireless features where they are not needed.