mod_cluster, as used in Red Hat JBoss Web Server 2.1, allows remote attackers to cause a denial of service (Apache http server crash) via an MCMP message containing a series of = (equals) characters after a legitimate element.
https://bugzilla.redhat.com/show_bug.cgi?id=1326320
http://www.securityfocus.com/bid/92584
http://rhn.redhat.com/errata/RHSA-2016-2055.html
http://rhn.redhat.com/errata/RHSA-2016-2054.html