Depends on the CPE, however as long as there is a default firewall, there would no real issues. The problem I've found is that too many CPE's allow IPv6 inboun

Depends on the CPE, however as long as there is a default firewall, there would no real issues. The problem I've found is that too many CPE's allow IPv6 inbound without a firewall, so it exposes end clients directly to the internet. With IPv4 generally there is a default drop all firewall rule.