Juniper Junos OS before 11.4R12-S4 12.1X44 before 12.1X44-D41 12.1X46 before 12.1X46-D26 12.1X47 before 12.1X47-D11/D15 12.2 before 12.2R9 12.2X50 before 12.2X50-D70 12.3 before 12.3R8 12.3X48 before 12.3X48-D10 12.3X50 before 12.3X50-D42 13.1 before 13.1R4-S3 13.1X49 before 13.1X49-D42 13.1X50 before 13.1X50-D30 13.2 before 13.2R6 13.2X51 before 13.2X51-D26 13.2X52 before 13.2X52-D15 13.3 before 13.3R3-S3 14.1 before 14.1R3 14.2 before 14.2R1 15.1 before 15.1R1 and 15.1X49 before 15.1X49-D10 when configured for IPv6 allow remote attackers to cause a denial of service (mbuf chain corruption and kernel panic) via crafted IPv6 packets.