Cisco IOS XE on ASR1000 devices, when PPPoE termination is enabled, allows remote attackers to cause a denial of service (device reload) via a malformed PPPoE packet, aka Bug ID CSCuo55180.
http://www.securitytracker.com/id/1030283
http://www.securityfocus.com/bid/67603
http://tools.cisco.com/security/center/viewAlert.x?alertId=34346
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3284