This exploit abuses the KEY_ARG buffer overflow that exists in SSL enabled Apache web servers that are compiled with OpenSSL versions prior to 0.9.6e. The apache-ssl-bug.c exploit is based on the Slapper worm (bugtraq.c), which is based on a early version of the apache-open-ssl exploit.
1be047c32ae0e2d1d8930d2ce4c4f7cc