Question

What are the common security vulnerabilities in smart contracts?

Answer 1

Common security vulnerabilities in smart contracts include:

1. Reentrancy: Allows an attacker to repeatedly call a vulnerable contract before the previous operations are completed.
2. Integer overflow and underflow: Arithmetic operations that exceed or go below the limits of an integer type, leading to unexpected behavior.
3. Denial of Service (DoS): Attackers can block the contract execution by consuming excessive gas.
4. Unchecked external call: Failure to validate the return value of an external call can lead to unexpected behavior.
5. Access control issues: Lack of proper access controls can allow unauthorized users to interact with critical functions.
6. Logic bugs: Flaws in the contract logic that can be exploited by attackers to manipulate the contract state.
7. Timestamp dependence: Reliance on timestamp values can be manipulated by miners to affect contract behavior.
8. Front-running: Attackers can exploit the order of transactions to gain an advantage in trading or other interactions with the contract.