Cisco IOS XR 4.3(.2) and earlier on ASR 9000 devices does not properly perform NetFlow sampling of IP packets, which allows remote attackers to cause a denial of service (chip and card hangs) via malformed (1) IPv4 or (2) IPv6 packets, aka Bug ID CSCuo68417.
http://www.securitytracker.com/id/1030623
http://www.securityfocus.com/bid/68833
http://tools.cisco.com/security/center/viewAlert.x?alertId=35009
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3322