The internet-connected devices in our homes can make life more entertaining, but they can also provide input to online wells. A few jokers have made a campaign with Chromecast hacking that apparently warns people about their vulnerability. Although they also market PewDiePie for some reason.
While hackers known as HackerGiraffe and j3ws3r have chosen to target Chromecasts, the error is not technically part of that device. They utilize a technology in many routers called UPnP (universal plug and play), which can allow remote access to devices on your network. Without the right security measures, someone you don't know can also get access. HackerGiraffe and j3ws3r used UPnP to display a warning message (see above) about the vulnerability, followed by an informal suggestion that you subscribe to video streamer PewDiePie. Read that you should think the couple is only useful, the URL in the warning is a Rickroll.
The hack site (currently down) contained a counter that showed that more than 3,000 units have been taken over by the warning. According to the site (and common sense), the best way to prevent attacks is to disable UPnP in your router. In a similar stunt in November, HackerGiraffe and j3ws3r were hijacked connected printers to print pages that announced PewDiePie. Streamer is currently in danger of being overtaken by India-based T Series as the top YouTube account of subscribers. Apparently this is something that gets HackerGiraffe and j3ws3r very riled up.