Apache CloudStack 4.0.0 before 4.0.2 and Citrix CloudPlatform (formerly Citrix CloudStack) 3.0.x before 3.0.6 Patch C uses a hash of a predictable sequence, which makes it easier for remote attackers to guess the console access URL via a brute force attack.
https://exchange.xforce.ibmcloud.com/vulnerabilities/83782
http://www.securitytracker.com/id/1028473
http://www.securityfocus.com/bid/59464
http://support.citrix.com/article/CTX135815
http://secunia.com/advisories/53204