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Last updated: February 09, 2026

SCWE-061: Outdated Compiler Version

Stable Version v1.0

This content is in the version-(v1.0) and still under active development, so it is subject to change any time (e.g. structure, IDs, content, URLs, etc.).

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Description

Using an outdated compiler version can expose a smart contract to vulnerabilities that have already been patched in newer versions. Compiler versions often include security fixes, optimizations, and new features that are crucial for the safety and performance of contracts.

Remediation

To mitigate this vulnerability, always use the most up-to-date stable version of the Solidity compiler. Ensure that your development environment is regularly updated to incorporate the latest security patches, optimizations, and features provided by newer versions of the compiler.

Vulnerable Contract Example

pragma solidity 0.4.24;  // Outdated compiler version

contract Vulnerable {
    uint public value;

    function setValue(uint _value) public {
        value = _value;
    }
}

Fixed Contract Example

pragma solidity 0.8.4;  // Updated compiler version for better security and performance

contract Fixed {
    uint public value;

    function setValue(uint _value) public {
        value = _value;
    }
}