The system is not currently designed to support cases where multiple correlated incidents may increase overall risk, such as multiple simultaneous compromises of organizations in a specific sector or region. This score drives CISA incident triage and escalation processes and assists in determining the prioritization of limited incident response resources and the necessary level of support for each incident. NCISS uses a weighted arithmetic mean to produce a score from zero to 100. The system is not intended to be an absolute scoring of the risk associated with an incident. NCISS permits a similar incident experienced by two different stakeholders to have significantly different scores based on the national-level potential impact of each affected entity. 2, Computer Security Incident Handling Guide, and tailored to include entity-specific potential impact categories that allow CISA personnel to evaluate risk severity and incident priority from a nationwide perspective. NCISS is based on the National Institute of Standards and Technology (NIST) Special Publication 800-61 Rev. The National Cyber Incident Scoring System (NCISS) is designed to provide a repeatable and consistent mechanism for estimating the risk of an incident in this context. Large-scale, national cybersecurity operations centers like the Cybersecurity and Infrastructure Security Agency (CISA) need to assess risk while accommodating a diverse set of private critical infrastructure asset owners and operators and U.S. However, such systems do not address incident prioritization or risk assessment from a nationwide perspective, which may involve large numbers of diverse enterprises. Many incident taxonomies and classification schemes provide excellent guidance within the scope of a single enterprise’s security operations center (SOC).
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