The disclosed computer-implemented method for protecting against unauthorized network intrusions may include (1) identifying a signal received by one or more antennas of a network from a transceiver of a device attempting to access the network, (2) detecting one or more signal strengths of the signal received by the antennas of the network in connection with the attempt to access the network, (3) determining, based at least in part on the signal strengths of the signal, that the attempt to access the network is potentially malicious, and then in response to determining that the attempt to access the network is potentially malicious, (4) initiating at least one security measure to address the potentially malicious attempt to access the network. Various other methods, systems, and computer-readable media are also disclosed.