The HTTPS Proxy feature in Cisco AsyncOS before 8.5.3-051 and 9.x before 9.0.0-485 on Web Security Appliance (WSA) devices allows remote attackers to cause a denial of service (service outage) by leveraging certain intranet connectivity and sending a malformed HTTPS request, aka Bug ID CSCuu24840.
http://www.securitytracker.com/id/1035163
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160302-wsa