It is possible to remotely Segfault Apache http server with a specially crafted string sent to the modcluster via service messages (MCMP).

Only the VirtualHost explicitly enabled by an administrator to receive service messages from worker nodes (Tomcat or EAP workers). Unless the administrator made a grave mistake in opening an unsecured modcluster management VirtualHost to the Internet without any authentication, it is impossible to exploit this bug from an untrusted client.

Special set of modcluster management protocol HTTP method requests. One could pass a certain number of = symbols in sequence after a legitimate element and cause segfault.