Category: Security Controls & Tailoring

Inherited Controls

Also known as: Control Inheritance, Security Control Inheritance

Simply put

Inherited controls are security protections that a system receives from another source, such as a parent organization, a higher-level system, or a cloud service provider, rather than implementing them on its own. This lets a system rely on protections that someone else has already developed, implemented, and assessed. As a result, the responsible party for a given system may not have to build every safeguard from scratch.

Formal definition

Control inheritance generally refers to a situation in which a system or application receives protection from controls (or portions of controls) that are developed, implemented, assessed, authorized, and monitored by entities other than those responsible for the system, such as a parent organization, a higher-level system, or an external service provider. A control inherited by one or more organizational information systems is commonly termed a common control (see also common control). In cloud and external service provider arrangements, inheritance typically flows from the provider to the client based on a contractual relationship, and the customer satisfies applicable control requirements by relying on the provider's implemented controls. Inheritance should be distinguished from reciprocity, which concerns the mutual acceptance of assessment or authorization results across parties rather than the receipt of controls themselves. Note that a control may be inherited only in part, in which case responsibility is shared and the inheriting system remains accountable for the non-inherited portions; practitioners should confirm the specific allocation and boundaries against the authoritative documentation for their system.

Why it matters

Control inheritance is central to how modern systems achieve and maintain an acceptable security posture without duplicating effort across every system boundary. When a system inherits controls from a parent organization, a higher-level system, or a cloud service provider, the responsible party avoids rebuilding safeguards that another entity has already developed, implemented, and assessed. This reduces redundant work and lets system owners focus their resources on the protections unique to their own environment. It also creates dependencies, however, and those dependencies must be understood and documented rather than assumed.

The most common expert-level mistake is treating an inherited control as fully satisfied when it is only inherited in part. Where inheritance is partial, responsibility is shared, and the inheriting system remains accountable for the portions it must implement itself. A system owner who overlooks the non-inherited portion of a shared responsibility can leave a genuine gap while believing the requirement is fully met. A related error is conflating inheritance with reciprocity: inheritance concerns the receipt of controls from another source, while reciprocity concerns the mutual acceptance of assessment or authorization results across parties. These are distinct concepts, and confusing them can lead to unsupported assumptions about what another party's authorization actually covers.

Because inheritance in cloud and external service provider arrangements typically flows from the provider to the client based on a contractual relationship, the strength of the inheritance is only as reliable as the underlying documentation and agreement. Practitioners should confirm the specific control allocation, boundaries, and shared-responsibility split against the authoritative documentation for their system rather than relying on general assumptions about what a provider covers.

Who it's relevant to

System Owners and Information System Security Managers

Those responsible for a system need to identify which controls are inherited, from what source, and whether the inheritance is complete or partial. Where inheritance is partial, they remain accountable for the non-inherited portions and must confirm the specific allocation and boundaries against their system's authoritative documentation.

Cloud Customers and Government Contractors

Organizations relying on a cloud service provider or other external service provider satisfy certain control requirements by inheriting controls that the provider has implemented, based on the underlying contractual relationship. They should confirm exactly which controls flow from the provider and which remain their own responsibility rather than assuming the provider covers a requirement in full.

Assessors and Auditors

Those evaluating a system must distinguish inherited controls from controls implemented by the system itself, and must distinguish inheritance from reciprocity. Assessors need to verify that claimed inheritance is supported by the source's implementation and documentation, and that any partial inheritance leaves no gap in the shared portions.

Parent Organizations and Common Control Providers

Entities that develop, implement, assess, and monitor common controls provide the basis on which subordinate systems build their posture. They should maintain clear documentation of what they offer for inheritance so that inheriting systems can accurately account for the controls they rely upon.

Inside Inherited Controls

Common Controls

Security and privacy controls that are provided by an entity other than the information system owner, typically at the organizational or infrastructure level, and made available for use by multiple systems. In NIST SP 800-53 and RMF terminology, inherited controls are frequently implemented as common controls managed by a common control provider.

Common Control Provider

The organization, program, or service that develops, implements, assesses, and maintains a control so that other systems can inherit it. Responsibility for the correct implementation and ongoing effectiveness of an inherited control generally remains with the provider, not the inheriting system owner.

Hybrid Controls

Controls that are partly inherited and partly implemented by the system itself. In most implementations, a portion of the control is satisfied by a provider while the system owner is responsible for the remaining, system-specific portion. Clear allocation of responsibility is essential to avoid gaps.

Responsibility Allocation

The documented assignment of who is accountable for each control or control element, often expressed through a responsibility matrix. For cloud environments this commonly appears as a Customer Responsibility Matrix (CRM) or shared responsibility model distinguishing provider-managed from customer-managed controls.

Authorization Package Documentation

Inheritance is typically recorded in the System Security Plan (SSP) and supporting artifacts, identifying which controls are inherited, from which provider, and any conditions on that inheritance. Assessment evidence for inherited controls generally derives from the provider's own authorization or assessment results.

Scope of Inheritance

The extent to which a control is fully, partially, or conditionally inherited. Inheritance does not automatically transfer across boundaries or authorization environments; the applicability depends on the provider's assessed scope, impact level, and any tailoring performed.

Common questions

Answers to the questions practitioners most commonly ask about Inherited Controls.

If a control is inherited from a cloud service provider or another system, does that mean my system is automatically compliant for that control?

No. Inheriting a control does not automatically make your system compliant. Inheritance generally means another entity (such as a cloud service provider, an enterprise service, or a common control provider) is responsible for implementing and maintaining that control, but your system must still confirm the control is actually available, properly scoped to your environment, and applicable to your specific requirements. You typically remain responsible for verifying the provider's implementation, documenting the inheritance in your system security plan, and addressing any portion of the control that is not fully covered by the provider. Inheritance shifts responsibility; it does not eliminate accountability.

Since FedRAMP already authorized my cloud provider's controls, can I just inherit those controls and assume they satisfy my DoD or agency requirements?

Not necessarily. A FedRAMP authorization applies at a specific impact level and reflects the FedRAMP PMO's or an authorizing agency's acceptance of a defined control baseline. Inheriting those controls does not automatically satisfy DoD requirements or another agency's tailored baseline, which may impose additional or more stringent controls, different scoping, or supplemental requirements for Controlled Unclassified Information or national security systems. You should confirm which controls are genuinely inheritable, whether the provider's impact level matches your needs, and whether your authorizing official accepts the inherited posture. Verify against the current authoritative requirements applicable to your environment rather than assuming equivalence.

How do I document inherited controls in my system security plan?

In most implementations, inherited controls are documented by identifying the providing entity (such as a common control provider, cloud service provider, or enterprise service), describing which control or control portion is inherited, and referencing the supporting evidence or agreement that establishes the inheritance. Where a control is only partially provided, the system security plan generally distinguishes the inherited portion from the portion your system is responsible for implementing (often described as a shared or hybrid responsibility). Confirm your organization's or agency's specific documentation format and expectations, as these can vary by authorizing body and applicable revision.

What is the difference between fully inherited, hybrid, and system-specific controls?

A fully inherited control is one for which the responsibility rests entirely with the providing entity, and your system relies on that provider's implementation. A hybrid (or shared) control is one where responsibility is divided, the provider addresses part of the control while your system implements the remainder. A system-specific control is implemented and maintained entirely by your own system with no reliance on an external provider. Correctly categorizing each control matters because it determines who is accountable for implementation, who supplies assessment evidence, and where residual responsibility lies. Confirm categorizations with the provider and your assessor, since misclassification can create coverage gaps.

Who is responsible for assessing inherited controls, and does inheritance reduce my assessment burden?

Assessment of a fully inherited control is generally performed by or on behalf of the providing entity, and your system may reference that assessment rather than independently testing the control. This can reduce, but does not eliminate, your assessment effort, you typically still need to confirm the provider's assessment is current, applicable to your usage, and adequate for your requirements, and you must independently assess any hybrid or system-specific portions. Assessment and authorization are distinct activities; relying on a provider's assessment does not by itself confer an authorization for your system.

What happens to my inherited controls if the providing entity changes its implementation or loses its authorization?

Inherited controls depend on the continued, effective operation of the providing entity, so a change to the provider's implementation, configuration, or authorization status can affect your system's posture. Continuous monitoring generally applies to inherited controls, meaning you should track the provider's status, review updates or notifications, and reassess the impact of any changes. If a provider's authorization lapses or its implementation degrades, the inheritance may no longer be valid, potentially requiring you to implement compensating measures or notify your authorizing official. An Authority to Operate is time-bound and subject to ongoing monitoring, so inherited coverage should not be treated as static.

Common misconceptions

If a control is inherited, the system owner has no remaining responsibility for it.

Inheritance transfers implementation responsibility only to the extent documented. Many controls are hybrid, requiring the system owner to implement a portion. The owner also generally retains responsibility for confirming that the inherited control actually covers their system's needs and for tracking its continued validity.

Inheriting controls from an authorized provider (such as a FedRAMP-authorized cloud service) automatically satisfies the inheriting system's requirements, including for DoD systems.

A provider's authorization applies to the provider's defined scope and impact level. Inheriting systems must confirm the provider's assessed boundary matches their own use, and a FedRAMP authorization does not automatically satisfy DoD or other agency-specific requirements. Assessment is not the same as authorization, and readers should verify against current authoritative guidance.

Once a control is inherited and accepted, the inheritance is permanent and needs no further attention.

Inherited controls are subject to the provider's continuous monitoring and to changes in the provider's authorization status, which is time-bound. If the provider's implementation changes, degrades, or loses its authorization, the inheriting system may need to reassess or reallocate responsibility for the affected controls.

Best practices

Document each inherited control in the System Security Plan, identifying the common control provider, the scope of inheritance, and whether the control is fully inherited or hybrid.

Maintain a responsibility matrix (such as a Customer Responsibility Matrix for cloud services) that clearly allocates provider-managed versus system-owner-managed control elements, and explicitly address hybrid controls.

Verify that the provider's assessed boundary, impact level, and any tailoring align with your system's actual use before relying on inheritance, rather than assuming coverage transfers automatically.

Track the authorization and continuous monitoring status of each common control provider, treating provider authorization as time-bound and reassessing when the provider's implementation or status changes.

Confirm that assessment evidence for inherited controls is current and traceable to the provider's authorization results, distinguishing what has been assessed from what has been authorized for your environment.

Confirm agency-specific and contractual requirements against current official sources, since acceptance of inherited controls and shared responsibility expectations can differ across FISMA, DoD RMF, and FedRAMP contexts.