The Overlay Transport Virtualization (OTV) implementation in Cisco IOS XE 3.10S allows remote attackers to cause a denial of service (device reload) via a series of packets that are considered oversized and trigger improper fragmentation handling, aka Bug IDs CSCup37676 and CSCup30335.
http://www.securitytracker.com/id/1032212
http://tools.cisco.com/security/center/viewAlert.x?alertId=38549