On Sunday evening, Slapper had been in circulation for less than 40 hours and had infected over 6,000 servers, according to Mikko Hypponen, manager of antivirus research at F-Secure. By Monday morning, Slapper had infected 11,249 machines. "For reference, Code Red — which is known as the worst Web worm so far — managed to infect only a couple of hundred servers within a similar time frame," Hypponen said. "Code Red then went on to infect over 300,000 Web servers during its peak in July 2001 and is still alive today."
Check your OpenSSL version. And upgrade if you aren’t up to the right rev.
[/home/paul]# openssl version
OpenSSL 0.9.6g 9 Aug 2002