Provide references for CVE-2017-6721.
Where can I find more information about CVE-2017-6721?
References are available at: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170621-waas, http://www.securitytracker.com/id/1038747, http://www.securityfocus.com/bid/99200.