Juniper chassis with Trio (Trinity) chipset line cards and Junos OS 13.3 before 13.3R8, 14.1 before 14.1R6, 14.2 before 14.2R5, and 15.1 before 15.1R2 allow remote attackers to cause a denial of service (MPC line card crash) via a crafted uBFD packet.