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First Flight #54
Beginner FriendlyDeFi
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Submission Details
Impact: low
Likelihood: medium

`ERC20` Contract Does Not Formally Implement `IERC20` Interface

Author Revealed upon completion

Root + Impact

The ERC20 contract has all required ERC20 functions but does not formally inherit from the IERC20 interface, potentially causing interface compatibility issues.

Description

  • While IERC20.sol exists in the codebase, the main ERC20 contract does not inherit from it.

  • This means type checking at compile time and runtime interface checks may fail.

contract ERC20 is IERC20Errors, ERC20Internals {
........................
}

Risk

Likelihood:

  • Any contract checking interface compatibility will be affected

  • Common in DeFi protocol integrations

Impact:

  • Contracts using interface type casting may fail

  • Some protocols may reject this token

Recommended Mitigation

+ import {IERC20} from "./IERC20.sol";
​
- contract ERC20 is IERC20Errors, ERC20Internals {
+ contract ERC20 is IERC20, IERC20Errors, ERC20Internals {

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