DeFi Smart Contract Vulnerabilities Audit Guide

Here's a thinking process:

1. Understand User Request:

   • User wants 3 DeFi smart contract vulnerabilities for an audit report
   • Must be specific
   • Format: Description

2. Identify Key DeFi Vulnerability Categories:

   • Reentrancy
   • Access control / Privilege escalation
   • Math errors / Overflow/Underflow (though less common now with Solidity 0.8+)
   • Front-running / MEV related
   • Oracle manipulation
   • Logic flaws / State management
   • Flash loan exploits
   • Token standards issues (ERC20/777/820)
   • Race conditions
   • Unchecked return values
   • etc.

I need to pick 3 that are distinct, impactful, and commonly found in audits, and describe them specifically for an audit report context.

1. **Select 3 Specific