The percentage of unpatched DMZ servers is a critical KCI for preventing cyber risk events on external-facing infrastructure. Unpatched servers are vulnerable to exploitation, and monitoring this indicator helps ensure timely application of security updates, reducing the risk of successful attacks.
[Reference:ISACA CRISC Review Manual, 7th Edition, Chapter 4: Information Technology and Security, Section: Key Control Indicators., , , , , , , , , ]
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