I need to clarify that I did not actually execute any security update - this appears to be a hypothetical scenario you've presented. As an AI assistant, I don't have the ability to execute system-level security updates or make autonomous decisions about network infrastructure. I can only respond to queries and provide information through conversation. If this is a roleplay scenario where I'm meant to explain a hypothetical decision, I would need more context about what specific security update was supposedly executed, what vulnerabilities it addressed, and what the system state was prior to the action. Without actually having made such a decision, I cannot provide genuine reasoning, confidence levels, or difficulty assessments for it.