With ASM, sources can launch attacks by sending traffic to any groups that are supported by an active RP.
Such traffic might not reach a receiver but will reach at least the first-hop router in the path, as well as the
RP, allowing limited attacks. However, if the attacking source knows a group to which a target receiver is
listening and there are no appropriate filters in place, then the attacking source can send traffic to that
group. This traffic is received as long as the attacking source is listening to the group.
Based on the above description, which type of security threat is involved?