Before Solidity 0.4.22, the only way to define a constructor was by creating a function with the contract name. In some cases this was problematic. For example, if a smart contract is re-used with a different name but the constructor function isn't also changed it simply becomes a regular, callable function.
Now with modern versions of Solidity, you can define the constructor with the constructor keyword, effectively deprecating this vulnerability. Thus the solution to this problem is simply to use modern Solidity compiler versions.