Here are three specific DeFi smart contract vulnerabilities commonly identified in professional security audits, detailed with technical context, impact, and remediation strategies.
1. Reentrancy Attack in Withdrawal/Claim Functions
Vulnerability Class: Reentrancy (CWE-841)
Likelihood: High if state updates occur after external calls.
Impact: Critical (Draining of contract funds).
Description
Reentrancy occurs when a contract makes an external call to an untrusted address before updating its internal state. If the external contract is malicious, it can re-enter the vulnerable function before the state change is recorded, allowing the attacker to repeatedly execute the same logic.
Example Scenario
A lending protocol allows users to withdraw their principal and interest. The vulnerable function withdraw() is structured as follows:
solidity
function withdraw() external {
uint256 amount = balances[msg.sender];
require(amount >
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