# Reentrancy Vulnerability ⎊ Area ⎊ Resource 2

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## What is the Vulnerability of Reentrancy Vulnerability?

A reentrancy vulnerability is a specific class of smart contract flaw where an external call allows an attacker's contract to recursively call back into the original contract before its state has been fully updated. This can lead to draining funds from protocols holding collateral for options or lending. Identifying this flaw is a primary objective of security analysis.

## What is the Error of Reentrancy Vulnerability?

This logical error permits an attacker to execute unintended state transitions, often resulting in the repeated withdrawal of assets that should have been locked or accounted for. Such an error can cause immediate, catastrophic loss of capital in leveraged DeFi positions. Prudent development practices aim to eliminate this possibility entirely.

## What is the Security of Reentrancy Vulnerability?

Mitigating this security risk involves implementing checks-effects-interactions patterns or using mutex locks within the contract code to ensure state updates complete before external calls return. A single oversight in this area can compromise the entire collateral pool backing derivative contracts.


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## [Blockchain Network Security Vulnerability Assessments](https://term.greeks.live/term/blockchain-network-security-vulnerability-assessments/)

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