NIST 800-53 RA-9 Mappings

Not all system components, functions, or services necessarily require significant protections. For example, criticality analysis is a key tenet of supply chain risk management and informs the prioritization of protection activities. The identification of critical system components and functions considers applicable laws, executive orders, regulations, directives, policies, standards, system functionality requirements, system and component interfaces, and system and component dependencies. Systems engineers conduct a functional decomposition of a system to identify mission-critical functions and components. The functional decomposition includes the identification of organizational missions supported by the system, decomposition into the specific functions to perform those missions, and traceability to the hardware, software, and firmware components that implement those functions, including when the functions are shared by many components within and external to the system.

The operational environment of a system or a system component may impact the criticality, including the connections to and dependencies on cyber-physical systems, devices, system-of-systems, and outsourced IT services. System components that allow unmediated access to critical system components or functions are considered critical due to the inherent vulnerabilities that such components create. Component and function criticality are assessed in terms of the impact of a component or function failure on the organizational missions that are supported by the system that contains the components and functions.

Criticality analysis is performed when an architecture or design is being developed, modified, or upgraded. If such analysis is performed early in the system development life cycle, organizations may be able to modify the system design to reduce the critical nature of these components and functions, such as by adding redundancy or alternate paths into the system design. Criticality analysis can also influence the protection measures required by development contractors. In addition to criticality analysis for systems, system components, and system services, criticality analysis of information is an important consideration. Such analysis is conducted as part of security categorization in RA-02.


Capability ID Capability Description Mapping Type ATT&CK ID ATT&CK Name
RA-9 Criticality Analysis Protects T1195.003 Compromise Hardware Supply Chain
RA-9 Criticality Analysis Protects T1495 Firmware Corruption
RA-9 Criticality Analysis Protects T1542 Pre-OS Boot
RA-9 Criticality Analysis Protects T1542.001 System Firmware
RA-9 Criticality Analysis Protects T1542.003 Bootkit
RA-9 Criticality Analysis Protects T1542.004 ROMMONkit
RA-9 Criticality Analysis Protects T1542.005 TFTP Boot
RA-9 Criticality Analysis Protects T1553 Subvert Trust Controls
RA-9 Criticality Analysis Protects T1553.006 Code Signing Policy Modification
RA-9 Criticality Analysis Protects T1601 Modify System Image
RA-9 Criticality Analysis Protects T1601.001 Patch System Image
RA-9 Criticality Analysis Protects T1601.002 Downgrade System Image