Which metric indicates the percentage of an asset's value lost during a risk event, used for calculating SLE?

The metric that indicates the percentage of an asset's value lost during a risk event is the Exposure Factor (EF). This metric is crucial in risk management and is used to determine how much of an asset's value is at risk in the event of a loss. It expresses this risk as a percentage and is specifically applied in the formula for calculating the Single Loss Expectancy (SLE), which is the expected monetary loss for a single incident.

The Exposure Factor allows organizations to assess the impact of specific risks on their assets, aiding in prioritization and resource allocation for security measures. When calculating SLE, which is the product of an asset's value and the Exposure Factor, the EF provides the percentage that reflects the potential loss directly tied to that asset during a risk event.

Understanding the EF is critical for effective risk management, as it helps quantify potential losses, enabling improved decision-making regarding risk mitigation strategies and resource investment. This metric plays a foundational role in overall risk assessment and management within an organization's cybersecurity framework.