Vulnerability Detected in ETH in 2019, Fixed with Berlin Update

The long-established Ethereum vulnerability that has persisted until this year has been fixed with the Berlin Hard Fork.

The vulnerability detected in ETH in 2019 was fixed with the Berlin update. Ethereum Foundation stated that the Berlin update, which is considered as one of the important steps of the transition to Ethereum 2.0 and provides a slight decrease in the costly transaction fees, as well as introducing new types of transactions, eliminates an clear and present threat that has been going on since 2019. The Berlin update was made on April 15, 2021 in 12,244,000 blocks. It was noted that the threat was "a well-known secret" in the Ethereum community and was noticed in October 2019. The statement said, "As the Berlin update is now behind us and Geth nodes use snapshots by default, we think the threat is so low that transparency takes the lead, and it is time to give a full account of the behind-the-scenes work." A total of 4 Ethereum Development Proposals (EIP) were implemented, including EIP-2565, EIP-2929, EIP-2718, EIP-2930, with the Berlin hard fork that came after the Istanbul hard fork in December 2019. The Berlin update made transaction fees more affordable than before.