I'm currently starting to read up on IPv6, and as soon as I heared that every device can/will have a public accessible adreess i got a little freaked out.
There are a lot of horror stories about unsecure webcams, "smart" devices with major security vulnarabilities or weak credentials. So far they were somehow protected by the NAT, so noone could reach them if they wouldnt be in the local network (excluding some UPnP trickery or the like).
With IPv6, EVERYTHING is publicly reachable. Since the change to iv6 will be invisible to the average user and they deffinitly wont bother configuring a firewall, would this mean that there will be huge increase in possibly exploitable devices?