The network element must be configured to restrict the acceptance of any IP packets from the unspecified address, (0:0:0:0:0:0:0:0 or ::/128).

From Perimeter Router Security Technical Implementation Guide Cisco

Part of IPv6 Unspecified ADDR is not blocked

SV-15405r1_rule The network element must be configured to restrict the acceptance of any IP packets from the unspecified address, (0:0:0:0:0:0:0:0 or ::/128).

Vulnerability discussion

The address 0:0:0:0:0:0:0:0, also defined ::/128 is called the unspecified address. It must never be assigned to any node. It indicates the absence of an address. One example of its use is in the Source Address field of any IPv6 packets sent by an initializing host before it has learned its own address.The unspecified address must not be used as the destination address of IPv6 packets or in IPv6 Routing Headers. A router must never forward an IPv6 packet with a source address of unspecified.

Check content

interface FastEthernet 0/0 description upstream link toward DoD Backbone ipv6 address 2001:db8:60::f14:65a1 ipv6 traffic-filter inbound-to-enclave in ipv6 access-list inbound-to-enclave remark block traffic with the unspecified address deny ipv6 ::/128 any log deny ipv6 any ::/128 log

Fix text

The administrator will configure the router ACLs to restrict IP addresses that contain any Unspecified Address.

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