Aave Faces Potential $230 Million Loss Due to Kelp DAO Bridge Exploit

A recent exploit of the Kelp DAO and LayerZero bridge has put lending protocol Aave at risk of losing up to $230 million, contingent upon the resolution of the situation. The incident revolves around rsETH, a liquid restaking token issued by KelpDAO, which utilizes a bridge mechanism to transfer tokens between blockchains. An attacker manipulated this setup by creating a forged transfer message, resulting in the creation of new tokens without backing and the release of 116,500 rsETH from the Ethereum-side bridge. Instead of selling the assets, the attacker used 89,567 rsETH as collateral to borrow approximately $190 million in ETH and related assets across Ethereum and Arbitrum, leaving Aave vulnerable to collateral with potentially impaired backing. Aave Labs promptly responded by freezing rsETH markets, setting loan-to-value ratios to zero, and halting new borrowing against the asset. The outcome now largely depends on how Kelp handles the shortfall. If losses are distributed among all rsETH holders, the token may experience a 15% depegging, resulting in around $124 million in bad debt for Aave. However, if losses are isolated to Layer 2 networks, the impact could be more severe, with bad debt rising to roughly $230 million, primarily affecting networks like Arbitrum and Mantle. The exploit was made possible by weaknesses in Kelp's verification of cross-chain messages using LayerZero, allowing the attacker to extract value from the system. This incident has raised concerns about the potential for undercollateralized loans and has led to a significant withdrawal of around $6 billion in total value locked from Aave. The episode highlights Aave's indirect exposure to external systems, resulting in increased collateral risk, pressure on lending positions, and a decline in deposits. Discussions are underway to address potential losses, with the Aave DAO treasury holding approximately $181 million in assets.