The FreeBSD Security Team has identified an issue in sctp and ip_multicast and has issued the following security advisories:
The SCTP protocol provides reliable, flow-controlled, two-way transmission of data. It is a message oriented protocol and can support the SOCK_STREAM and SOCK_SEQPACKET abstractions. The SCTP protocol checks the integrity of messages by validating the state cookie information that is returned from the peer.
IP multicast is a method of sending Internet Protocol (IP) datagrams to a group of interested receivers in a single transmission.
Please read and take the recommended action(s).