The sad truth is that LG ain't alone with vulnerabilities and not everyone of those can or even will be fixed. Many times vendors simply point to EOL ( end of life ) for the specific product and the customer can't do anything. But with TVs and even so called smart TVs there is actually possible workarounds. A mediabox! That is the one that would get hit by any type of attack. It's just that it would take a huge amount of time and energy trying to find the least vulnerable and in general peoples local TVs ain't the majority of online targets. It does happen, even ransomware but with a regular updated and not too old router I personal wouldn't worry much.
Check out the basic security tips ( the short list ) for a router here. That alone is a huge step in the right direction.
Router Security Home Page
routersecurity.org