Decentralized finance (DeFi) protocol Conic Finance said Friday that it had suffered an exploit that allowed an attacker to grab over 1,700 ether (ETH), worth over $3.6 million at current prices, that affected one of its Omnipools. Reentrancy is a common bug that allows attackers to trick a smart contract by making repeated calls to a protocol in order to steal assets. A call is an authorization for the smart contract address to interact with a user’s wallet address.