The Ethernet Connectivity Fault Management (CFM) handling feature in Cisco IOS 12.2(33)SRE9a and earlier and IOS XE 3.13S and earlier allows remote attackers to cause a denial of service (device reload) via malformed CFM packets, aka Bug ID CSCuq93406.
https://exchange.xforce.ibmcloud.com/vulnerabilities/97758
http://www.securitytracker.com/id/1031119
http://www.securityfocus.com/bid/70715
http://tools.cisco.com/security/center/viewAlert.x?alertId=36184
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3409