title: Is that means vulnerable function If I execute shell code via program
body: <p>Lets say that I have a program and its name is : <code>EXEC</code></p>
  
  <p>Everytime I start the program with some code it executes the code that I wrote.</p>
  
  <p><strong>For example :</strong> If I write : <code>./EXEC cat /etc/shadow</code> I can see the shadow file.It executes <code>cat /etc/shadow</code></p>
  
  <p>I did some researches (actually did my best with my english level) and understood that it is a vulnerability.However I couldn't see any message that can answer my question.Therefore I want your helps.</p>
  
  <p>How can that be a vulnerability ? May I got it wrong, is that really vulnerability ? Thanks for your messages from now.</p>