CrashCast is a tool developed by Amir Khashayar Mohammadi specifically for mass exploitation of Googles streaming dongles. The tool is intended as a proof-of-concept to show users in a non-damaging way that outside interference in the local network is possible with little effort. CrashCast abuses a feature used by ChromeCast devices to play videos on the TV set. At the moment of writing, there were over 180,000 Chromecasts, most of them in South Korea. To avoid unpleasantness, make sure that local devices do not communicate with the internet directly.”]
Source: https://www.bitdefender.com/blog/hotforsecurity/pranking-chromecast-owners-easy/