Re-Entrancy

Reentrancy is a vulnerability in smart contracts that occurs when a contract calls an external contract and the external contract calls back into the original contract before the original contract has completed its execution. This can create a loop where the same function is executed repeatedly, potentially leading to unintended consequences such as transferring more funds than intended, locking up the contract, or other unexpected behavior.

Types of Re-Entrancy Attacks

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1. Single-Function Reentrancy : This type of attack occurs when a single function in a contract is called multiple times before the previous call completes which we have already discussed above.

2. Cross-Function Reentrancy

3. Cross-Contract Reentrancy

4. Cross-Chain Reentrancy

5. Read-Only Reentrancy