Description

Solidity developers commonly use the ReentrancyGuard from OpenZeppelin — a trusted and battle-tested implementation — to protect critical functions from reentrancy attacks.

Instead of using that, this contract manually defines:
bool private _locked; and creates a custom nonReentrant modifier to manage this state.

While technically valid, re-implementing this behavior is unnecessary and increases the surface area for human error. It's also less readable and harder to maintain compared to the OpenZeppelin standard.

Root + Impact

#Risk
Likelihood:

Every time a function with nonReentrant is called, this logic is engaged.

Since this pattern is re-implemented manually, developers may overlook nuanced edge cases or introduce bugs when modifying or extending it.

Impact:

Increases maintenance burden by duplicating existing security patterns.

Risk of inconsistent implementation if the logic is reused or modified elsewhere.

Potential loss of trust from auditors and users familiar with OpenZeppelin standards.

Proof Of Concept

Explanation:
This duplication of critical security functionality introduces unnecessary complexity and risk. Using OpenZeppelin's library would simplify the codebase and align with industry best practices.

Recommended Mitigation

Explanation:
This replacement removes the need to manually manage lock state and aligns with widely audited standards. It improves readability, reduces gas slightly, and simplifies future security reviews.