Several crypto exchanges have temporarily suspended ERC20 deposits due to the discovery of an Ethereum (available on Coinbase) smart contract bug.

A Medium post from April 22nd announced the discovery. Labelled as the “batchOverflow” vulnerability, this Ethereum (available on Coinbase) smart contract bug allows hackers to generate a large number of tokens from nothing and then deposit those tokens into a regular Ethereum (available on Coinbase) address.

The initial discovery was of an extremely large transfer of BeautyChain, or BEC, tokens. Two large token transfers were completed, each being deposited into two different addresses. After further analysis of other contracts, the results showed that “more than a dozen of ERC20 contracts are also vulnerable to batchOverflow.”

The team behind the discovery has attempted to contact all teams who own the vulnerable contracts so that somETHing can be done to fix the problem.