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.