Juniper Junos OS before 12.1X44-D55 12.1X46 before 12.1X46-D40 12.1X47 before 12.1X47-D25 12.3 before 12.3R10 12.3X48 before 12.3X48-D20 13.2 before 13.2R8 13.2X51 before 13.2X51-D40 13.3 before 13.3R7 14.1 before 14.1R5 14.1X53 before 14.1X53-D18 or 14.1X53-D30 14.1X55 before 14.1X55-D25 14.2 before 14.2R4 15.1 before 15.1R2 and 15.1X49 before 15.1X49-D10 allow remote attackers to cause a denial of service via a malformed IGMPv3 packet aka a \multicast denial of service.\