August 4, 2020 - Opyn ETH Put contract hack $370,000

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Attackers have exploited a vulnerability in the Opyn ETH Put contract. One of the first members of Crypto Twitter to report on the theft, DegenSpartan, stated on Aug. 4 that the traders used flash loans to buy Ethereum Put oTokens (oETH) from Uniswap. They then reportedly chose an ERC20 token — in this case, USD Coin (USDC) — as collateral and exercised the trading option. The result was reportedly a double transfer which effectively “stole” the collateral. According to blockchain records, the attackers received both their original Ethereum (ETH) deposits and USDC options. Source https://twitter.com/DegenSpartan/status/1290699622013231104