The BNB Smart Chain (BSC) has reportedly experienced copycat attacks due to a vulnerability in the Vyper programming language, similar to the exploit on the decentralized finance (DeFi) protocol Curve Finance. Blockchain security firm BlockSec tweeted that around $73,000 worth of cryptocurrencies on BSC across three exploits had been stolen.

The vulnerability was caused by a malfunctioning reentrancy lock on Vyper versions 0.2.15, 0.2.16 and 0.3.0, which is used by a number of DeFi pools. White hat and black hat hackers have been attempting to disrupt each other's exploit attempts or efforts to recover funds.