Cisco WebEx Meetings Server 1.5 presents the same CAPTCHA challenge for each login attempt, which makes it easier for remote attackers to obtain access via a brute-force approach of guessing usernames, aka Bug ID CSCuj40321.
https://exchange.xforce.ibmcloud.com/vulnerabilities/100552
http://www.securitytracker.com/id/1031543
http://www.securityfocus.com/bid/71978
http://tools.cisco.com/security/center/viewAlert.x?alertId=36990
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-8034