As part of a warning about a security bug, hackers this week took over thousands of Chromecast media streamers to promote the controversial YouTuber PewDiePie.

The hackers, who go by the aliases Hacker Giraffe and J3ws3r, exploited the Universal Plug and Play networking standard in routers to force Chromecasts to display a message on users' TVs, according to TechCrunch.

"ATTENTION," the message read, according to a screenshot posted by TechCrunch, which you can see above. "YOUR Chromecast/Smart TV is exposed to the public internet and is exposing sensitive information about you!" The message then directed users to a site, which has since been removed, with more information about the so-called CastHack and also encouraged them to subscribe to PewDiePie.

Hackers could use this technique to make Chromecasts play any YouTube video, TechCrunch noted. Disabling Universal Plug and Play on your router should, however, correct the issue.

Google did not immediately respond to PCMag's request for comment but told TechCrunch this is a router issue, not a Chromecast flaw.

"We have received reports from users who have had an unauthorized video played on their TVs via a Chromecast device," a Google spokesperson told TechCrunch. "This is not an issue with Chromecast specifically, but is rather the result of router settings that make smart devices, including Chromecast, publicly reachable."

Security researchers, meanwhile, have warned of similar bugs affecting Chromecast in the past. One researcher TechCrunch spoke to said Google should be doing more to protect its streamer from these types of hijacks.

The latest Chromecast, released in October, earned a "good" rating in PCMag's review.

"It's the same media streamer as the previous model, with only a slight design change, support for 1080p60, and a claimed performance bump," PCMag's Will Greenwald wrote in the review. "It remains a useful device, but without 4K capability it's much less appealing than it was a few years ago."