The network device must block IPv6 multicast addresses used as a source address.

From Perimeter Router Security Technical Implementation Guide Cisco

Part of IPv6 Multicast Source ADDR are not blocked

SV-15407r3_rule The network device must block IPv6 multicast addresses used as a source address.

Vulnerability discussion

IPv6 multicast addresses should never be a source address. They should only be destination addresses.

Check content

Review the perimeter router configuration to ensure filters are in place to restrict the IP addresses. Verify that ingress and egress ACLs for IPv6 have been defined to deny the multicast source addresses and log all violations.

Fix text

Configure the perimeter router access control lists to deny any IPv6 multicast address used as a source address.

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