The remote host appears to be running a version of Apache 2.x which is older than 2.0.50. There is denial of service in apache httpd 2.0.x by sending a specially crafted HTTP request. It is possible to consume arbitrary amount of memory. On 64 bit systems with more than 4GB virtual memory this may lead to heap based buffer overflow. See also http://www.guninski.com/httpd1.html There is also a denial of service vulnerability in mod_ssl's ssl_io_filter_cleanup function. By sending a request to vulnerable server over SSL and closing the connection before the server can send a response, an attacker can cause a memory violation that crashes the server.

Upgrade to Apache/2.0.50 or newer