Aave Faces Potential Losses of Up to $230 Million Following 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, with the final impact hinging on the resolution of the situation. According to a report from Aave Labs and LlamaRisk, the incident revolves around rsETH, a liquid restaking token issued by KelpDAO, which relies on a bridge mechanism to transfer tokens between blockchains. An attacker exploited 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 swiftly contained the risk 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, with possible outcomes including a 15% depegging of rsETH if losses are spread across all holders, resulting in around $124 million in bad debt for Aave, or a more severe impact of roughly $230 million in bad debt if losses are isolated to Layer 2 networks. The exploit was made possible by weaknesses in Kelp's verification of cross-chain messages using LayerZero, allowing the attacker to make certain assets appear fully backed when they were not. This incident has raised concerns about the potential for undercollateralized loans and has led to a withdrawal of around $6 billion in total value locked from Aave, highlighting the indirect exposure of the platform to external systems and the need for caution in the DeFi ecosystem.