Juniper Junos 10.0 before 10.0S28 10.4 before 10.4R7 11.1 before 11.1R5 11.2 before 11.2R2 and 11.4 before 11.4R1 when in a Next-Generation Multicast VPN (NGEN MVPN) environment allows remote attackers to cause a denial of service (RPD routing daemon crash) via a large number of crafted PIM (S G) join requests.