IPv6 filtering works but the support for the protocol is incomplete. Amongst other things, there’s no ICMPv6 filtering and there’s no support for IPv6 extension headers.
Unfortunately, the options provided in CIS do not provide ICMPv6 filtering. In CIS currently, one may either allow all ICMPv6 traffic, or none. As ICMPv6 is critical to the correct functioning of IPv6, correct filtering is paramount. unfortunately, the current implementation is almost completely useless. You may read more here
Could you please demonstrate this?
What are the security risks coming with this?
Here’s a fairly simple explanation. You may also wish to read RFC 2460