Cisco IOS XR on Trident line cards in ASR 9000 devices lacks a static punt policer, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted packets, aka Bug ID CSCun83985.
http://www.securitytracker.com/id/1030525
http://www.securityfocus.com/bid/68351
http://tools.cisco.com/security/center/viewAlert.x?alertId=34843
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3308