Bankroll Hack

On June 19, 2025, the Bankroll Network DeFi protocol suffered an exploit resulting in a loss of approximately $65,000 due to an integer underflow vulnerability in its sell() function on both Ethereum and Binance Smart Chain.

The attacker exploited a legacy integer underflow vulnerability in the sell() function of the BankrollNetworkStack contract, which was compiled with Solidity 0.6.8—a version that does not automatically revert on arithmetic underflows. By manipulating dividend payout calculations using signed integers without proper checks, the attacker caused erroneous balance adjustments that allowed them to drain funds. This exploit affected users who had previously interacted with or approved the compromised contracts.

Notably, this is the second known exploit of Bankroll Network, following a $235K hack in September 2024.