Not true. See:
Correct. No need to be rude, though.
Perhaps you shouldn't have asked, which is why I asked that you not say stop. I thank you; but didn't expect the rudeness, though. You asked what could occur with WAN closed by default - then you suggest some extraordinarily special use case.
So I highlighted mine as well.
Actuall,y there's bots/scanners/malware that scan and try public IPs 24/7/365.
Honesty, these exploits on old firmware are n00b-script-level, not state-actor level (it seems you're trying to imply the the notion is far-fetched by mentioning N. Kor.