Cisco IOS XE 2.x before 2.4.3 and 2.5.x before 2.5.1 on ASR 1000 devices allows remote attackers to cause a denial of service (Embedded Services Processor crash) via a crafted series of fragmented (1) IPv4 or (2) IPv6 packets, aka Bug ID CSCtd72617.
http://www.securitytracker.com/id/1033131
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150730-asr1k