Cisco IOS allows remote authenticated users to cause a denial of service (device reload) via malformed IPsec packets, aka Bug ID CSCui79745.
http://www.securitytracker.com/id/1030473
http://www.securityfocus.com/bid/68177
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3299