OS Security does claim OSsurance detects buffer overflow attacks on programs running on your computer, using a...
patent-pending method of protection. It blocks the execution of the malicious code by ensuring system resources are being used only by legitimate code. By checking the memory page attributes pointed to by the return address of the running process, it can stop the buffer overflow attack from crashing your computer. Their site states that they support Windows 2000 and Windows 2003 server, so, I suggest you download and test the fully functional 60-day trial copy so you can evaluate its performance and effectiveness firsthand.
Dig Deeper on Application attacks (buffer overflows, cross-site scripting)
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