The integrated HTTPS server in Siemens RuggedCom ROS before 3.12.2 allows remote attackers to hijack web sessions by predicting a session id value.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2013-6726
http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-324789.pdf