Nessus is a vulnerability scanning and assessment tool that can be used to scan systems for potential vulnerabilities and weaknesses. It provides detailed reports on any critical and high-severity findings as referenced in the CVE database, making it the ideal tool for fulfilling the Chief Information Security Officer's request. Nikto, fuzzer, wireshark, and prowler are all security tools, but they are not applicable for the scenario described in the question. Here is a link to an article from CompTIA's website about Nessus for your reference: https://www.comptia.org/content/nessus-vulnerability-scanning-and-assessment-tool.