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Audit VaultToken.sol for security issues

Found 2 issues:

HIGH

Reentrancy on withdraw() — ETH sent before state is updated

MED

No onlyOwner guard on mint()

Fix all issues →

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VaultToken.sol

ERC20Token.sol

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VaultToken.sol

ERC20Token.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

import "@openzeppelin/contracts/access/Ownable.sol";

contract VaultToken is ERC20, Ownable {

mapping(address => uint256) public stakedAmount;

mapping(address => uint256) public ethRewards;

constructor() ERC20("Vault Token", "VLT") Ownable(msg.sender) {

_mint(msg.sender, 10_000_000 * 10**18);

}

function deposit(uint256 amount) external {

require(amount > 0, "Amount must be > 0");

_transfer(msg.sender, address(this), amount);

stakedAmount[msg.sender] += amount;

}

function withdraw(uint256 amount) external {

require(stakedAmount[msg.sender] >= amount);

uint256 reward = ethRewards[msg.sender];

(bool ok, ) = payable(msg.sender).call{value: reward}("");

require(ok, "ETH send failed");

stakedAmount[msg.sender] -= amount; // ⚠ state updated after call

ethRewards[msg.sender] = 0;

_transfer(address(this), msg.sender, amount);

}

function mint(uint256 amount) external {

_mint(msg.sender, amount);

}

RemixAI

Pro

Audit VaultToken.sol for security issues

Found 2 issues:

HIGH

Reentrancy on withdraw() — ETH sent before state is updated

MED

No onlyOwner guard on mint()

Fix all issues →

Solidity 0.8.20VaultToken.solLn 21, Col 1

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Audit this contract for security issues

Found 2 issues:

HIGH

Reentrancy on withdraw() — add nonReentrant modifier

MED

Missing access control on mint() — restrict to onlyOwner

Fix both and optimize for gas

Both issues fixed. Gas reduced by 14% — saved 2,840 gas on withdraw().

function withdraw() external
nonReentrant onlyOwner {
// updated contract ready →

Compile and deploy to Sepolia

RemixAI

✓ Compiled0 errors · 0 warnings

✓ DeployedSepolia

0x742d35Cc6634C0532…8f3aEtherscan →

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