When conducting a DeFi smart contract audit, these three vulnerabilities represent the most frequent and critical security risks. Below are descriptions formatted for a professional audit report.
1. Reentrancy Vulnerability (External Call Integrity)
Description:
A reentrancy vulnerability occurs when a contract makes an external call to an untrusted contract before it updates its internal state (e.g., balances). If the external contract contains a malicious fallback() or receive() function, it can recursively call back into the original function, repeatedly executing the state-changing logic before the first transaction completes.
- Impact: An attacker can drain funds from a pool by withdrawing more tokens than they actually own, as the balance check only executes after the attacker has already "withdrawn" multiple times within the same execution context.
- Specific Evidence: Look for the "Checks-Effects-Interactions" pattern violation. Specifically, identify
call()or
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