Juniper Junos 11.4 before 11.4R12, 12.1 before 12.1R10, 12.1X44 before 12.1X44-D35, 12.1X45 before 12.1X45-D25, 12.1X46 before 12.1X46-D20, 12.1X47 before 12.1X47-D10, 12.2 before 12.2R8, 12.3 before 12.3R7, 13.1 before 13.1R4, 13.2 before 13.2R4, 13.3 before 13.3R2, and 14.1 before 14.1R1, when Auto-RP is enabled, allows remote attackers to cause a denial of service (RDP routing process crash and restart) via a malformed PIM packet.