OUSD Suffers "Classic Re-entrancy Attack" Resulting in $7.7 Million Loss, DeFi Security Urgently Needs Resolution

Recently, PeckShield detected that the DeFi protocol Origin Protocol's stablecoin OUSD was attacked. The attacker used flash loans from derivatives platform dYdX to conduct a re-entrancy attack, causing losses of $7.7 million in ETH and DAI.