The remote host is vulnerable to a Denial of Service (DoS) attack
The remote host appears to be running a version of Apache 2.x that 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 amounts of memory. On 64 bit systems with more than 4GB virtual memory this may lead to heap based buffer overflow.
Upgrade to most recent version of Apache.