This chapter explores a range of DeFi frauds and exploits that have targeted decentralized finance protocols. It delves into the mechanics of flash loan attacks, parallel DeFi exploits, and the vulnerabilities inherent in cross-chain bridge hacks. Highlighting notable cases such as Radiant Capital and Hedgey Finance, the chapter outlines the evolution and increasing complexity of these attack strategies, emphasizing the importance of proactive security measures and the role of regulatory frameworks in mitigating these risks.