Juniper Junos 11.4 before R11 12.1 before R9 12.1X44 before D30 12.1X45 before D20 12.1X46 before D15 12.1X47 before D10 12.2 before R8 12.2X50 before D70 12.3 before R6 13.1 before R4 13.1X49 before D55 13.1X50 before D30 13.2 before R4 13.2X50 before D20 13.2X51 before D15 13.2X52 before D15 13.3 before R1 when using an em interface to connect to a certain internal network allows remote attackers to cause a denial of service (em driver bock and FPC reset or \go offline\) via a series of crafted (1) CLNP fragmented packets when clns-routing or ESIS is configured or (2) IPv4 or (3) IPv6 fragmented packets.