DEXX was drained for $21M after private keys for 12,413 wallets were compromised. MoonHacker lost $320K by failing to validate mToken calls in its vault contract, letting attackers inject malicious tokens. Clipper suffered a $458K hit as low-liquidity pools on Optimism and Base enabled profitable price manipulation.
On December 23rd, the MoonHacker exploit on Optimism resulted in a $320K loss. The root cause was missing access control in the executeOperation() function of the MoonHacker vault contract. This function facilitates operations like supplying, borrowing, and redeeming tokens by interacting with mToken contracts, representing lending market assets in Moonwell’s ecosystem. However, the mToken parameter was not validated to ensure it belonged to a legitimate Moonwell market, and the function lacked restrictions on who could call it. The attacker was able to feed a malicious contract as the mToken address to drain the vault.
Exploited Contract (on Optimism): 0x24592ed1ccf9e5ae235e24a932b378891313fb75
Transaction: 0xd12016b25d7aef681ade3dc3c9d1a1cc12f35b2c99953ff0e0ee23a59454c4fe
On December 1st, the Clipper exploit on the Optimism and Base networks resulted in a $458K loss. The attacker targeted Clipper pools with low balances and low constant product (k) values and manipulated the pool’s state to withdraw more assets than deposited. The low liquidity in Optimism and Base pools allowed minor swaps to significantly affect the pool’s price ratios. This imbalance increased the value of tokens during withdrawals.
Clipper Optimism Pool Contract: 0x5130f6ce257b8f9bf7fac0a0b519bd588120ed40
Clipper Base Pool Contract: 0xb32d856cad3d2ef07c94867a800035e37241247c
Transaction: 0x45fcb83d65d96d6ea0e90a71c6bf9b68ce8635031b67d0ee9389c8fba2cdc042
On November 16th, the DEXX exploit on Solana, Ethereum, Base, and BSC resulted in a $21M loss. The root cause was a private key leak that compromised user wallets and enabled unauthorized transactions. The attack compromised 8,338 Solana addresses and 4,075 ETH, Base, BSC addresses. The DEXX team has acknowledged the exploit and offered to allocate 80% of daily platform revenue to reimburse affected users.
List of Affected Wallets (on Solana): https://docs.google.com/spreadsheets/d/1NMcba32lkeHk5Al4zKB8IOlLGkP8A5TFCp2oDbToaqQ/edit?gid=792798014#gid=792798014
Transaction: KdCzjQBcbsWJx4rWuxirfrSThKnUrqhtB119TPjyKUQ2aqNdRCnjJLSTbQq5qV9Hjz2Ms9ZqGcFEXfWmThnGEGc