AppNav in Cisco IOS XE 3.8 through 3.10 before 3.10.3S, 3.11 before 3.11.3S, 3.12 before 3.12.1S, 3.13 before 3.13.0S, 3.14 before 3.14.0S, and 3.15 before 3.15.0S allows remote attackers to execute arbitrary code or cause a denial of service (device reload) via a crafted TCP packet, aka Bug ID CSCuo53622.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2015-0657
http://www.securitytracker.com/id/1031981
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150325-iosxe