A security information and event management (SIEM) system is a tool that collects, analyzes, and correlates security events from various sources, such as firewalls, intrusion detection systems, antivirus software, and other devices. A SIEM system can provide real-time alerts, dashboards, reports, and forensic analysis of security incidents. The greatest value of a SIEM system is that it can facilitate the monitoring of risk occurrences by identifying anomalies, trends, patterns, and indicators of compromise that may otherwise go unnoticed. A SIEM system can also help with incident response, compliance, and audit activities by providing evidence and documentation of security events.

References =

ISACA, CISM Review Manual, 16th Edition, 2020, page 2291

ISACA, CISM Review Questions, Answers & Explanations Database - 12 Month Subscription, 2020, question ID 2082

The greatest value provided by a Security Information and Event Management (SIEM) system is facilitating the monitoring of risk occurrences. SIEM systems collect, analyze and alert on security-related data from various sources such as firewall logs, intrusion detection/prevention systems, and system logs. This allows organizations to identify security threats in real-time and respond quickly, helping to mitigate potential harm to their systems and data.