Security expert details five common reentrancy vulnerabilities in small DeFi vaults

A security reviewer states that many small DeFi vaults incorrectly rely on a single nonReentrant guard on the withdraw function. The analysis identifies five recurring vulnerability patterns that exist elsewhere in contract code. These include state inconsistencies during external calls, exploitable view functions, token transfer callbacks, and issues with shared state across multiple contracts. The root cause is often a failure to follow the Checks-Effects-Interactions pattern, updating state only after making external calls.