Solidity Attack Vector #18: Outdated Compiler Version

Using an old version of Solidity (like 0.4.x or 0.5.x) exposes your contract to known, documented bugs that have been fixed in newer releases.

Common Risks in Old Versions

- Integer overflow/underflow (fixed by default in 0.8.0).

- Memory allocation bugs.

- Storage pointer bugs.

Recommendation

Always use the latest stable version of Solidity (currently 0.8.x). If you must use an older version, ensure you are using SafeMath and are aware of the specific SWC (Smart Contract Weakness Classification) entries for that version.