Cisco Security Advisory – A vulnerability in the Cisco implementation of Multicast Virtual Private Network (MVPN) is subject to exploitation that can allow a malicious user to create extra multicast states on the core routers or receive multicast traffic from other Multiprotocol Label Switching (MPLS) based Virtual Private Networks (VPN) by sending specially crafted messages.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/64923/cisco-sa-20080326-mvpn.txt
Source: https://packetstormsecurity.com/files/64923/Cisco-Security-Advisory-20080326-mvpn.html