DeFi Smart Contract Vulnerabilities Audit Guide

Here are three specific DeFi smart contract vulnerabilities suitable for inclusion in a professional audit report, complete with technical details, impact assessment, and remediation guidance.

1. Missing Access Control on Critical Functions

Vulnerability Description:

Critical administrative or operational functions (e.g., setOwner, updateFeeRecipient, pause, emergencyWithdraw) are not protected by access control modifiers such as onlyOwner or onlyRole. This allows any external address to call these functions and alter the contract’s state or ownership.

Technical Example (Solidity):

// VULNERABLE CODE
function setFeeRecipient(address newRecipient) external {
    feeRecipient = newRecipient; // No access control!
}

Impact:

• Full Fund Drain: An attacker can call setFeeRecipient(attacker_address) and then trigger a transaction that sends fees to themselves.
• Contract Compromise: If