1. Reentrancy: A vulnerability that allows attackers to repeatedly call a contract’s function and extract funds from the system by continually draining it of its assets.
2. Unchecked Call Return Values: An issue that allows Ethereum addresses to send ETH to an incorrect address because the return value of the sending transaction was not checked properly.
3. Integer Overflow/Underflow: A flaw which results in incorrect calculations due to the maximum or minimum value being exceeded.
4. Unprotected Functions: Functions that should be kept secure, but have been left open and unsecured, leaving them vulnerable to attacks.
5. Insecure Randomness: A problem where malicious parties can predict and control outcomes in smart contracts which use these functions to generate random numbers.
6. Unprotected Ether Wallets: Key storage mechanisms which are vulnerable to attackers who can steal funds and modify the contents of the wallet.
2. Unchecked Call Return Values: An issue that allows Ethereum addresses to send ETH to an incorrect address because the return value of the sending transaction was not checked properly.
3. Integer Overflow/Underflow: A flaw which results in incorrect calculations due to the maximum or minimum value being exceeded.
4. Unprotected Functions: Functions that should be kept secure, but have been left open and unsecured, leaving them vulnerable to attacks.
5. Insecure Randomness: A problem where malicious parties can predict and control outcomes in smart contracts which use these functions to generate random numbers.
6. Unprotected Ether Wallets: Key storage mechanisms which are vulnerable to attackers who can steal funds and modify the contents of the wallet.