Juniper Junos OS before 12.1X44-D50, 12.1X46 before 12.1X46-D35, 12.1X47 before 12.1X47-D25, 12.3 before 12.3R10, 12.3X48 before 12.3X48-D15, 13.2 before 13.2R8, 13.3 before 13.3R7, 14.1 before 14.1R5, and 14.2 before 14.2R1 do not properly handle TCP packet reassembly, which allows remote attackers to cause a denial of service (buffer consumption) via a crafted sequence of packets “destined to the device.”