With the advancements in technology, blockchain systems have seen widespread use and rapid growth in the field of data security and verification. Blockchain is used in a variety of applications, including financial transactions, healthcare, insurance, Internet of Things, education, and many more, with the promise of increased skills and resilience. This smart distributed peer-to-peer design drew interest from a variety of businesses and communities outside the financial sphere. The major focus of the proposed work is on security challenges and limitations of Ethereum-based smart contracts. Ethereum smart contract is vulnerable to reentrancy security attack. The proposed work analyze reentrancy attacks and assess countermeasures to dissuade vulnerabilities on the network.