Adobe LiveCycle Data Services 3.1 and earlier, LiveCycle 9.0.0.2 and earlier, and BlazeDS 4.0.1 and earlier do not properly restrict creation of classes during deserialization of (1) AMF and (2) AMFX data, which allows attackers to have an unspecified impact via unknown vectors, related to a "deserialization vulnerability."
http://www.securitytracker.com/id?1025657
http://www.securitytracker.com/id?1025656
http://www.adobe.com/support/security/bulletins/apsb11-15.html