Cisco IOS XE 3.1 through 3.17 and 16.1 on 64-bit platforms allows remote attackers to cause a denial of service (data-structure corruption and device reload) via fragmented IPv4 packets, aka Bug ID CSCux66005.
http://www.securitytracker.com/id/1036914
http://www.securityfocus.com/bid/93202
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160928-frag