Buffer overflow in 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 allows remote attackers to execute arbitrary code by leveraging access to a directly connected client and transmitting crafted data.