Wu Shuo learned that the blockchain security team BlockSecTeam has issued a statement stating that its Phalcon system has detected a hacker attack on the Usual protocol, and the protocol has now been suspended. Security researcher Tonykebot analyzed that the root cause of the attack lies in the exploitation of Usual's VaultRouter contract, which allows USD0++to be exchanged for USD0 at a 1:1 ratio, thereby profiting through arbitrage, involving an amount of approximately 18.99 million USD0++(approximately 19.43 million USD)