Visible devices are only some of the network-connected devices in your environment. There are hundreds, quite possibly thousands, of other devices you don’t know about on your network. You don’t scan them periodically, and you have no idea of their security posture. Each one can be attacked, and might provide an adversary with opportunity to gain presence in your environment. Your attack surface is much larger than you thought. In our Shining a Light on Shadow Devices paper, we discuss the attacks on these devices which can become an issue on your network, along with some tactics to