Abstract: A method to assess network vulnerabilities of devices may include accessing, by a relay device, a network that includes a firewall to separate the network from external networks such that the relay device is coupled to the network from behind the firewall attached to the network. The method may further include establishing a communication channel over a secondary network between the relay device and a monitor system. The method may further include detecting one or more devices behind the firewall attached to the network by the relay device. The method may also include after establishing the communication channel and detecting the one or more devices and while the relay device is coupled to the network from behind the firewall attached to the network, performing, by the monitor system, one or more network vulnerability assessments on the one or more devices via network communications that pass through the relay device.