# Reentrancy Protection ⎊ Area ⎊ Resource 2

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## What is the Security of Reentrancy Protection?

Reentrancy protection refers to the implementation of security measures within smart contracts to prevent reentrancy attacks, a critical vulnerability in decentralized finance protocols. This protection ensures that a contract's state cannot be modified by an external call before the initial transaction completes. The goal is to safeguard user funds and maintain the integrity of the protocol's logic.

## What is the Vulnerability of Reentrancy Protection?

A reentrancy vulnerability occurs when an external contract call recursively calls back into the original contract, potentially draining funds or manipulating state variables before the transaction finishes. This exploit has historically led to significant losses in DeFi protocols. Effective protection mechanisms are essential for mitigating this specific type of risk.

## What is the Mechanism of Reentrancy Protection?

Common protection mechanisms include the checks-effects-interactions pattern, where state changes are applied before external calls, and mutex locks, which prevent multiple calls from executing simultaneously. Implementing robust reentrancy protection is a fundamental requirement for developing secure and reliable derivatives platforms on a blockchain.


---

## [Cryptographic Security Margins](https://term.greeks.live/term/cryptographic-security-margins/)

## [Recursive Proof Composition](https://term.greeks.live/term/recursive-proof-composition/)

## [Blockchain Network Security Auditing](https://term.greeks.live/term/blockchain-network-security-auditing/)

## [Blockchain Security Audit Reports](https://term.greeks.live/term/blockchain-security-audit-reports/)

---

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**Original URL:** https://term.greeks.live/area/reentrancy-protection/resource/2/