The Cluster::deliveredEvent function in cluster/Cluster.cpp in Apache Qpid, as used in Red Hat Enterprise MRG before 1.3 and other products, allows remote attackers to cause a denial of service (daemon crash and cluster outage) via invalid AMQP data.
The SessionAdapter::ExchangeHandlerImpl::checkAlternate function in broker/SessionAdapter.cpp in the C++ Broker component in Apache Qpid before 0.6, as used in Red Hat Enterprise MRG before 1.3 and other products, allows remote authenticated users to cause a denial of service (NULL pointer dereference, daemon crash, and cluster outage) by attempting to modify the alternate of an exchange.
sys/ssl/SslSocket.cpp in qpidd in Apache Qpid, as used in Red Hat Enterprise MRG before 1.2.2 and other products, when SSL is enabled, allows remote attackers to cause a denial of service (daemon outage) by connecting to the SSL port but not participating in an SSL handshake.