The BFD daemon in Juniper Junos OS 12.1X44 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 13.3R6, 14.1 before 14.1R5, 14.1X50 before 14.1X50-D85, 14.1X55 before 14.1X55-D20, 14.2 before 14.2R3, 15.1 before 15.1R1, and 15.1X49 before 15.1X49-D10 allows remote attackers to cause a denial of service (bfdd crash and restart) or execute arbitrary code via a crafted BFD packet.