What Is a Zero De Vulnerability?

Attackers could use it as one stop shop to dump all their n whatever malicious files they were sharing or down loading. It even came with a torrent down load, little programme am anda. The bug allows you to access the private networks of over a hundred thousand homes around the world. What would you do if you had this kind of knowledge and capability? Would you try to sell these exploits on a dark mark for some bitcoin? How would it make you feel in this situation?