The law is relatively simple on this matter: if the company entered into a contract to pay commissions, and the agent satisfied the terms of those commissions, then the company is required to pay the commissions absent a bankruptcy that eliminates or reorganizes the debt.
On top of that, based on the facts provided, the CFO has committed an intentional tort--interference with contract, meaning that punitive damages are available, i.e., up to 3x actual damages.
Yes, it would require the individual to go to court. The likely outcome is that he would receive a very large sum of money, and the CFO would likely get blacklisted from CFO and finance positions at any reputable company.