Category: Governance & Leadership

Security Operating Model

Also known as: Cyber Operating Model, Cyber Target Operating Model, TOM, Security Service Delivery Model

Simply put

A security operating model is the structure that defines how an organization actually runs its security program on a day-to-day basis. It clarifies who holds each decision, which teams carry out which tasks, and how the pieces of the security function fit together. In practice, it acts as a blueprint for organizing security work so that responsibilities are clear and the program can operate consistently.

Formal definition

A security operating model specifies how security responsibilities, decision rights, and execution are distributed across an organization, mapping accountability, roles, and workflows to the teams and functions that deliver them. It typically describes the structure of the security organization, the allocation of decisions and tasks, and the service delivery approach, which may follow top-down, bottom-up, or hybrid methodologies depending on organizational context. A target operating model (TOM) represents the intended future-state design used to structure the security organization for resilience and proactive cyber risk management. The effectiveness of any operating model generally depends on organizational maturity, clearly defined scope, stakeholder cooperation, and the principle that security is treated as a shared, cross-functional responsibility rather than the concern of a single team.

Why it matters

Without a defined security operating model, security programs tend to run on improvisation. Decisions get made ad hoc, responsibilities blur across teams, and critical tasks fall through the gaps because no one is clearly designated to own them. A security operating model addresses this by making the structure explicit: who holds each decision, which teams execute which work, and how the parts of the security function connect. This clarity is what allows a program to operate consistently rather than depending on the memory or goodwill of individual contributors.

The operating model also reframes security as a shared, cross-functional responsibility rather than the concern of a single team. When security is treated as everyone's responsibility, the model becomes the mechanism that distributes accountability, roles, and workflows across the organization in a coherent way. This matters especially as organizations grow or mature, because informal arrangements that worked at a small scale often break down when more teams, tools, and decisions are involved. A well-designed model provides a stable structure that can absorb that growth.

It is worth being clear about scope: an operating model is a design and organizing framework, not a guarantee of security outcomes. Its effectiveness generally depends on organizational maturity, clearly defined scope, and stakeholder cooperation. A model on paper that is not backed by genuine cross-functional buy-in and accurate role definitions will not deliver the consistency it promises. The value comes from the structure being both well-designed and actually adopted in day-to-day practice.

Who it's relevant to

Security leaders and CISOs

Those responsible for a security program use the operating model to define decision rights, allocate roles, and establish consistent workflows across teams. It gives them a structured way to show how the security function is organized and how responsibilities are distributed rather than relying on informal arrangements.

Virtual and fractional CISOs

In engagements focused on governance and program structure, a virtual or fractional CISO often helps design or refine a security operating model as part of directing strategy. This falls within the advisory and program-development scope typical of these roles; the accountability for adopting and running the model generally remains with the client organization and its officers. The model's value in these engagements depends heavily on client cooperation and access to the relevant stakeholders.

Executives and organizational officers

Business leaders benefit from an operating model because it clarifies where accountability for security decisions sits and how security work connects to the broader organization. It supports treating security as a cross-functional business responsibility rather than a purely technical concern owned by one team.

Organizations designing a future-state security function

Companies planning to grow, restructure, or mature their security program use a target operating model (TOM) to define the intended future-state design. This is relevant for organizations aiming to structure their security function for resilience and proactive cyber risk management, though the outcome depends on organizational maturity and clearly defined scope.

Inside Security Operating Model

Governance Structure

Defines how security decisions are made, escalated, and approved, including committees, reporting lines, and the delineation between advisory direction and organizational accountability. In a virtual CISO engagement, the vCISO typically shapes this structure while formal accountability for decisions remains with the client's officers.

Roles and Responsibilities

Clarifies who performs, owns, and oversees security activities across the organization. This often distinguishes strategic and governance functions, which a vCISO typically provides, from hands-on operational tasks such as SOC monitoring or tool administration, which generally fall outside a standard vCISO scope unless explicitly contracted.

Risk Management Processes

Establishes how risks are identified, assessed, prioritized, and treated, often aligned to frameworks such as NIST CSF or ISO 27001. A security operating model documents how risk decisions flow to business leadership rather than treating security as a purely technical function.

Program and Capability Domains

Organizes security work into functional areas such as policy, identity, vulnerability management, third-party risk, and incident preparedness. The model maps which capabilities are delivered internally, by external providers, or through advisory guidance from a vCISO.

Operating Rhythm and Cadence

Defines the recurring meetings, reviews, and reporting cycles that keep security activities coordinated. In many fractional or virtual engagements, this cadence depends on stakeholder availability and defined access to decision-makers.

Framework and Compliance Alignment

Positions the operating model against relevant standards or regulations such as SOC 2, HIPAA, PCI DSS, GDPR, or CMMC. This typically supports readiness and governance rather than guaranteeing certification or compliance outcomes.

Common questions

Answers to the questions practitioners most commonly ask about Security Operating Model.

Is a security operating model the same as buying and configuring security tools?

No, and this is a common misconception that experts would correct. A security operating model defines how security responsibilities, decision rights, governance structures, and workflows are organized across an organization. Tools may support the model, but the model itself is about people, accountability, processes, and how security decisions get made and executed. Treating it as a purely technical or tooling exercise misses that security leadership is fundamentally a governance and business risk function. A well-defined operating model can exist independently of any specific tool selection.

Does engaging a virtual CISO to define a security operating model mean the vCISO becomes accountable for security decisions within that model?

Generally no. A virtual CISO typically advises on and helps design the operating model, including how roles, responsibilities, and decision rights are structured. However, legal and organizational accountability for security decisions usually remains with the client organization and its officers unless a contract specifies otherwise. It is important to separate responsibility from accountability: the vCISO may take responsibility for guiding the design and directing certain activities, but the accountability for outcomes typically stays with the client's leadership. Conflating the two is a mistake experienced buyers would flag.

How does a security operating model account for tasks a virtual CISO does not typically perform?

Because a virtual CISO generally provides strategy, governance, and program direction rather than hands-on operational work such as SOC monitoring, tool administration, or incident response execution, a security operating model should explicitly map who performs those operational functions. In many engagements this means identifying internal staff, managed service providers, or other vendors responsible for execution, and defining how they coordinate with the vCISO-directed strategy. Clarifying these boundaries within the model helps prevent the assumption that a vCISO replaces an entire security team.

What organizational factors influence how effective a security operating model will be?

Effectiveness often depends on organizational maturity, the availability and cooperation of stakeholders, clearly defined scope, and access to decision-makers. A model designed for an organization with limited internal security capability may look different from one built for a more mature environment. In many cases the value of the model is constrained by whether leadership actively supports the defined decision rights and whether responsible parties have the resources to fulfill their assigned roles.

How does a security operating model relate to frameworks such as NIST CSF or ISO 27001?

Frameworks such as NIST CSF or ISO 27001 can inform how an operating model organizes functions, controls, and governance responsibilities. A model may be structured to support readiness against such frameworks, but designing an operating model does not by itself guarantee compliance or certification. It is important to distinguish between using a framework to shape roles and processes and asserting that the resulting model achieves a certified or compliant state, which typically requires separate assessment and validation.

How is a security operating model typically documented and maintained over time?

In many engagements the operating model is documented through artifacts that describe roles and responsibilities, decision rights, reporting lines, and key workflows, often reflected in items such as responsibility assignment charts and governance charters. Because organizations and their risk environments change, the model generally requires periodic review and updating rather than being treated as a one-time deliverable. The cadence and depth of these reviews may vary by provider and by the maturity and needs of the client organization.

Common misconceptions

A security operating model is primarily a technical architecture defining tools and controls.

A security operating model is chiefly a governance and business-risk construct describing how decisions, accountability, and capabilities are organized. Technology choices sit within it, but treating it as a purely technical artifact misses its function as a coordination and accountability framework.

Engaging a virtual CISO means the operating model and its outcomes become the vCISO's responsibility and liability.

A vCISO typically advises on and helps direct the operating model, but legal and organizational accountability for security decisions generally remains with the client organization and its officers unless a contract specifies otherwise.

A defined security operating model, or a vCISO who builds one, replaces the need for a security team or operational providers.

A security operating model documents how work is divided; it does not perform the work. A vCISO provides strategy and governance and is not a managed security service provider, so hands-on operational execution still requires appropriate internal staff or contracted providers.

Best practices

Document scope boundaries explicitly, distinguishing strategic and governance functions a vCISO typically provides from operational tasks such as SOC monitoring or incident response execution that fall outside standard scope unless contracted.

Separate accountability from responsibility in the model, clarifying which activities are advised or directed versus which decisions remain the legal accountability of client officers.

Align the operating model to a recognized framework such as NIST CSF or ISO 27001, while describing framework use as supporting readiness rather than guaranteeing certification or compliance.

Tailor the model to organizational maturity, since its value often depends on client cooperation, defined scope, and stakeholder access rather than on a fixed template.

Establish a clear operating rhythm with recurring reviews and reporting so security governance remains coordinated across internal teams and any external providers.

Revisit and adjust roles, responsibilities, and cadence as the organization matures or as engagement type shifts, for example when moving between fractional, interim, or advisory arrangements.