Leadership
What does a fractional CISO do for a defense contractor?
A fractional CISO is a senior security leader who runs your security program part time, on a defined engagement, instead of as a full time employee. For a small defense contractor, that usually means one accountable person who owns the CMMC plan, the scope, the System Security Plan, the vendor decisions and the conversations with leadership, while your IT provider and staff do the day to day work. This article explains what the role covers, how it differs from an MSP, and how to tell whether it is the right fit.
What does a fractional CISO actually do?
A fractional CISO owns the security program the same way a full time CISO would, for the hours and period the engagement covers. That means setting priorities, deciding what is in scope, approving the security architecture, owning the policies and the System Security Plan, holding vendors to the plan, and explaining risk to the people who have to accept it.
For a defense contractor the work is anchored to the contract obligations. The fractional CISO translates DFARS 252.204-7012, NIST SP 800-171 and the CMMC level in your contracts into a plan with owners and dates, and then makes sure the plan gets done. The value is not that one person knows every control. It is that one person is accountable for the whole program.
How is a fractional CISO different from an MSP?
An MSP implements and operates technology, while a fractional CISO decides what the technology must achieve and checks that it does. The MSP configures the firewall, patches the servers and answers the help desk. The CISO decides how the boundary should be drawn, whether the logging meets the requirement and whether a risk is acceptable.
Having both roles in one company creates a conflict. An MSP that also judges its own work has little reason to report its own gaps. Separating leadership from operations gives the owner an independent view, and it gives the MSP a clear brief instead of a moving target.
When does a small contractor need one?
A small contractor needs one when security decisions are being made without anyone senior enough to own them. Common triggers are a new contract with DFARS 7012 or a CMMC level, a prime asking for an SPRS score, a customer questionnaire nobody can answer, an incident, or an owner who has been told different things by different vendors.
It is also the right model when the work is heavy for a period and lighter afterward. A CMMC readiness effort needs sustained senior attention for a stretch of time. Once the environment is built and documented, the program needs regular oversight rather than full time leadership, and the engagement can scale down with it.
What does a typical month look like?
A typical month includes a program review with leadership, working sessions with the IT provider, decisions on open questions, review of evidence and documentation, and an update to the plan of action. The CISO tracks the requirements that are still open, the dates that are slipping and the risks that need a decision.
Between those sessions the CISO is the person your staff and vendors go to when a security question comes up: a new software request, a customer asking where CUI is stored, an odd alert, a prime's flow down clause. A good engagement makes those questions quick to answer because the program already has a documented position on most of them.
What should a fractional CISO deliver?
A fractional CISO should deliver a program you can see, not just advice. That includes a written scope and boundary, a current System Security Plan, a POA&M with owners and real dates, policies that match practice, a risk register with documented acceptance decisions, and regular briefings that show progress against the plan.
It should also leave the company more capable. Procedures should be written so staff can follow them, evidence should be organized so the next assessment is easier than the last, and decisions should be recorded so they survive a change of vendor or staff. If the engagement ends and nobody can explain the program, it was not delivered.
How do you choose the right one?
Choose someone who has led programs under the obligations in your contracts, not only someone who knows security in general. Ask how they would scope your environment, what they would do in the first month, how they work with an existing MSP, and how they report progress. Ask to see sample deliverables with client details removed.
Be cautious of anyone who promises an assessment outcome or a score before seeing your environment. The assessor decides the outcome. A credible leader will tell you what it will take, where the risks are, and what they cannot know until they look.
How does the engagement end or scale down?
It scales down when the program can run on oversight rather than leadership, and that point should be visible in the plan from the start. Signs that it has arrived include a current SSP that staff keep up to date, a POA&M with few open items, an IT provider working to a clear brief, and leadership briefings that report steady state rather than catch up.
At that stage many contractors keep a lighter arrangement: a quarterly program review, support before each annual affirmation, and a senior person to call when something unusual happens. The handover should be deliberate, with documentation and decisions transferred so the program does not depend on the memory of whoever led it.
What does the company still own?
The company still owns the risk and the decisions. A fractional CISO recommends, plans and leads, but leadership accepts risks, approves investment and signs representations such as the annual CMMC affirmation. Those responsibilities cannot be delegated to a vendor, however capable.
The company also owns the people. Staff need time to do the work, follow the procedures and complete training. The engagements that go well are the ones where leadership gives the program visible priority and holds its own people, as well as its vendors, to the plan.