The Rendezvous Daemon (rvd), Rendezvous Routing Daemon (rvrd), Rendezvous Secure Daemon (rvsd), and Rendezvous Secure Routing Daemon (rvsrd) in TIBCO Rendezvous before 8.4.2, Messaging Appliance before 8.7.1, and Substation ES before 2.8.1 do not properly implement access control, which allows remote attackers to obtain sensitive information or modify transmitted information via unspecified vectors.