Why do you even ask? Why do you even think this is at all unlikely?

It doesn't even matter what exploits are publicly known and closed at any given moment. What we know is that at every given moment, no matter what security hole was just found and closed right now in some device, always later it turns out there were others not yet known by you but known and used by someone. This has been everything with an OS for 40 years. So yes, of course, right now, on every tv, and everything else, from any manufacturer, there are "grade 9-10" exploits just sitting there. It's the default state not some exception.