Debugging vs Reverse Engineering

Jason Long via Gdb <[email protected]>
Newsgroups gmane.comp.gdb.devel
Message-ID <[email protected]> 
Hello folks,I have two questions:
1- Can a debugger like GDB be used to find the vulnerability?

2- When a hacker finds a vulnerability in a program, has that hacker used debugging techniques or reverse engineering?
Any idea welcomed.

Thank you.
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