Unspecified vulnerability in SecureICA and ICA Basic encryption of Citrix Presentation Server 4.5 and earlier, Access Essentials 2.0 and earlier, and Desktop Server 1.0 can cause clients to use weaker encryption settings than configured by the administrator, which might allow attackers to bypass intended restrictions.

More... (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-2299)