The IKE implementation in the VPN component in Cisco ASA Software 9.1 before 9.1(5.1) allows remote attackers to cause a denial of service (device reload) via crafted UDP packets, aka Bug ID CSCul36176.
http://www.securityfocus.com/bid/70302
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20141008-asa