Flash loan attack
Yearn Finance stated that its yDAI vault was exploited for the loss of $11 million. They added that the vault is no longer vulnerable. Though the attacker robbed Yearn of $11 million, exorbitant fees cost them millions to execute the hack. They reportedly only profited $2.7 million, while liquidity pool fees and staker fees during the attack both came to $3.5 million each. Aave v2 fees amounted to $1.4 million. The hacker took out a series of flash loans from dYdX and Aave, then used the funds as collateral for another loan on Compound. In doing this, the attacker essentially gamed the exchange rates on Yearn to accumulate CRV tokens to sell for stablecoins.
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