The IP Device Tracking (IPDT) feature in Cisco IOS and IOS XE allows remote attackers to cause a denial of service (IPDT AVL corruption and device reload) via a crafted sequence of ARP packets, aka Bug ID CSCuh38133.
http://www.securitytracker.com/id/1029423
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6705