TwentyOne

Summary:
In blackjack Ace can play both as 1 and 11. It can change It's value depends on the situation.

Vulnerability Details:
In this example Ace would be considered only as 1

Impact:
If we draw 1 (Ace) and 7 our total will be 8, but if we count Ace as 11 It will be 18 which closer to 21 and in the end the main point in the game is to be as close as possible or eqeual to 21.

Tools Used:
Manuel review.

Recommendations:
I suggest to refactor both dealersHand and playersHand. If you add a check that is: if(cardValue ==1) if it's true declare a variable to store Ace as 11 and continue to the next card withoud modifing totalValue. After the for loop is over add another check that calculates Ace + totalValue and if it over 21, Ace will be added to totalValue as 1, but if it less then will be added as 11.