Bunni Identifies Smart Contract Rounding Errors in $8.4M Flash Loan Exploit

05/09/2025 11:50

Bunni has released a report detailing a vulnerability that led to an $8.4 million flash loan exploit, affecting the weETH/ETH pair on Unichain and the USDC/USDT pair on Ethereum. The exploit was due to rounding errors in smart contracts during user withdrawals, which the attacker used to manipulate prices and liquidity. The attacker borrowed 3 million USDT via a flash loan, manipulated token prices, and exploited rounding errors in 44 small withdrawals to deplete USDC liquidity. Bunni has updated the rounding code and restored cross-chain withdrawals, while other functions remain suspended. The platform is collaborating with law enforcement to trace funds and is offering a 10% bounty for the return of the stolen assets.

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