What an External CISO Does and When an SME Needs One

Somebody in your company decides whether an update gets applied, somebody answers the security questionnaire a client just sent, and somebody would have to decide what gets shut down first if ransomware appeared tomorrow. If those are three different people, or worse, if it is unclear who they are, you have a security leadership problem. An external CISO is the figure who fills that seat: the person accountable for company security, with a level of dedication proportionate to an SME.

What an external CISO actually does

An external CISO leads security rather than performing it hands-on. The job is to decide what gets done, in what order and against what budget, and to make sure the decisions turn into completed work. In an SME that translates into a fairly stable set of functions:

• Security governance: keeping a complete view of systems, data, access and suppliers, and knowing at any moment where the biggest risk sits.
• Prioritisation: turning a long list of technical problems into three things to do this quarter, judged by business impact rather than by theoretical severity.
• Board communication: explaining the state of security in terms of risk, cost and timescales, so budget decisions get made on information instead of fear.
• Supplier oversight: defining what each technical provider is asked to deliver, reviewing what comes back, and keeping the company from depending on the commercial judgement of whoever is selling to it.
• Client and audit responses: answering security questionnaires, preparing the documentation contracts demand, and holding the technical conversation with the client running the audit.
• Incident readiness: putting in writing who decides, who gets called and what happens in the first hours, then checking that plan works before it is needed.

What you receive: the concrete deliverables

The fair question when buying leadership instead of execution is what physically lands on your desk. These are the deliverables that define the service:

• A current inventory of systems, cloud services, domains, access rights and suppliers.
• A cybersecurity risk assessment written in business language, with the operational impact of each risk.
• A security plan with dated actions, a named owner and an estimated cost.
• A periodic report for management: what changed, what got fixed, what remains open.
• A one-page incident response plan that a non-technical person can follow.
• The answers to your clients' security questionnaires, with supporting documentation.

The first ninety days

A good external CISO engagement follows a recognisable sequence. Knowing what it looks like lets you check whether what you are being offered resembles it.

Weeks 1 to 4: discovery

Interviews with management, with whoever runs the systems, and with the people handling sensitive data daily. An inventory of what actually exists rather than what an old document claims. A review of supplier contracts and of the security requirements already arriving from clients.

Weeks 5 to 8: analysis and plan

A risk assessment prioritised by business impact, and a work plan covering the coming months. In parallel, the obvious fixes get applied: excess access rights, accounts belonging to people who have left, two-factor on email and banking.

Weeks 9 to 12: execution and routine

Agreed work starts, review frequency gets established, and the incident process is put in place. By the end of the quarter management has a report stating where the company was, where it is, and what comes next.

When an SME reaches the point of needing one

There are fairly clear signals that security has outgrown somebody's spare time:

• A client has sent a security questionnaire and nobody in the company can answer half the questions.
• You work with large clients inside the scope of the NIS2 directive and they pass requirements down to you contractually, even though your own size keeps you outside direct scope.
• You sell to the public sector or sit in a public-sector contractor's supply chain, with the requirements of Spain's Esquema Nacional de Seguridad (Real Decreto 311/2022) in play.
• You handle personal data at volume and need to sustain GDPR and LOPDGDD compliance with something more solid than good intentions.
• You have had a scare: an attempted CEO fraud, an encrypted machine, a compromised mailbox.
• You have three technical providers and none of them owns the overall picture.

If two or more of these look familiar, your company's security is already consuming management time without anyone actually leading it.

What an external CISO does not do

The limits deserve equal clarity. An external CISO does not administer your servers or run day-to-day IT support. They do not replace your systems provider: they direct and supervise it. They also do not personally run the penetration tests or the vulnerability scans, though they decide when those are needed, define their scope, and make sure findings end up fixed. And they do not guarantee you will never suffer an incident, because nobody can guarantee that. What they do is lower the probability and cut the reaction time substantially.

The next step

If your company has reached the point where security decisions arrive late, get made by whichever provider is in the room, or simply never get made, the missing piece is leadership. The external CISO service provides that figure at the level of dedication a 10 to 50 employee company needs. If you are also weighing up bringing someone in house, the full comparison of cost, availability and coverage sits in the guide on an external CISO versus an in-house hire.