The decentralized finance (DeFi) sector recently faced another major security incident. According to monitoring by the renowned security team PeckShield, the DeFi platform Convergence was subjected to an attack that resulted in the loss of approximately $210,000 worth of assets. The attackers successfully exploited vulnerabilities in the system, minting about 58 million CVG tokens (the native token of Convergence), which were then converted into 60 WETH (Wrapped Ether) and 15,900 crvFRAX. This sequence of actions indicates that the attackers thoroughly analyzed the Convergence system and were adept at utilizing DeFi protocol security exploit techniques. The specific vulnerability was found in the CvxRewardDistributor contract, which is responsible for distributing rewards to contributors. However, the contract did not implement necessary validation mechanisms for user inputs, allowing untrusted user inputs to be claimed as rewards directly. This oversight provided an opportunity for the attackers to carry out such large-scale token minting and exchange operations. This event once again serves as a warning to participants in the DeFi field, emphasizing the importance of security measures even in a decentralized environment. For developers, understanding the operational mechanisms of smart contracts, strengthening user input validation mechanisms, and conducting regular security audits are effective means to prevent such attacks. For users, it's crucial to manage their assets with caution, understand the risk profiles of projects, and avoid becoming targets of illegal activities.