Race condition in the SSL implementation on Cisco Intrusion Prevention System (IPS) devices allows remote attackers to cause a denial of service by making many management-interface HTTPS connections during the key-regeneration phase of an upgrade, aka Bug ID CSCui25688.
http://www.securitytracker.com/id/1031780
http://www.securityfocus.com/bid/72700
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2015-0631