A system was hardened at the Operating System level and placed into the production environment.

 Explanation of Issue:

Change management processes ensure that updates and configuration changes to systems are documented, reviewed, and approved. The absence of such processes can lead to insecure configurations over time.

This could include unauthorized changes, missed updates, or deviations from the originally hardened state.

 Why Other Options Are Less Likely:

A. Lack of asset management processes: This deals with inventory and tracking of assets rather than configuration changes.

C. Lack of hardening standards: The system was initially hardened, so standards were likely in place.

D. Lack of proper access controls: While important, this is unrelated to the system's deviation from the hardened state.

 EC-Council CISO Reference:

The CISO program emphasizes the critical role of change management in maintaining secure configurations and compliance over time.