Cisco AsyncOS before 8.5.3-069 and 8.6 through 8.8 on Web Security Appliance (WSA) devices mishandles memory allocation for HTTP requests, which allows remote attackers to cause a denial of service (proxy-process reload) via a crafted request, aka Bug ID CSCuu02529.
http://www.securitytracker.com/id/1035910
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160518-wsa3