6 October 2026 · 9 min read · By Michael van Mameren, Lead Penetration Tester (OSCP)
MSSP vs MDR vs SOC as a Service: What Each Delivers, and Which One You Actually Need
Three labels, overlapping vendors, and a buying decision that usually goes wrong at the first question: who responds when something happens? This guide separates the three models by what they do, not by what they are called, and gives you a way to pick.
Three models, one question: who acts?
A managed security service provider (MSSP) operates your security controls: firewalls, email security, vulnerability management, log collection, SIEM, and the people who watch the dashboards. Managed detection and response (MDR) is narrower and deeper: a provider hunts for threats in your endpoints, identities and cloud telemetry and takes containment action when it finds one. SOC as a service is the monitoring function itself, delivered from the provider's security operations centre, usually around your SIEM, with alerting as the main output.
The question that separates them is what happens at 03:00 when an alert fires. An MSSP typically monitors and escalates according to a runbook. An MDR provider investigates and contains, isolating the host or disabling the account, within a committed time. A SOC as a service tells you, and your team acts. Everything else, including price, follows from that answer.
MSSP vs MDR vs SOC as a service, side by side
Generalised from how the models are sold in 2026. Individual providers blur the lines; the contract decides.
| Dimension | MSSP | MDR | SOC as a service |
|---|---|---|---|
| Core job | Operate and monitor security controls across the estate | Detect, investigate and contain active threats | Monitor and triage alerts, escalate to you |
| Scope | Broad: perimeter, email, vulnerability management, SIEM, compliance reporting | Focused: endpoints, identities, cloud and network telemetry | Whatever feeds the SIEM |
| Who responds | Escalation to your team per runbook; some MSSPs add response tiers | The provider, with pre-agreed containment actions | Your team, after notification |
| Threat hunting | Rarely included by default | Core part of the service | Occasionally, as an add-on |
| Technology | Often the provider's own stack, sometimes yours | Usually the provider's EDR/XDR platform, or yours under their management | Your SIEM or theirs |
| Typical buyer | Organisations without a security team that need controls run | Organisations with some IT capability that need 24/7 detection and response | Organisations with a security team that need eyes on glass |
| Pricing model | Per device, per user or per control; monthly | Per endpoint or per user; monthly | Per data volume or per source; monthly |
| Compliance fit | Strong for NIS2 and ISO 27001 operational controls | Strong for incident detection and reporting duties (NIS2 24h, DORA) | Supports logging and monitoring requirements |
How to choose
Four questions settle most decisions.
1. Do you have anyone to respond?
If nobody on your side can isolate a laptop at night, you need MDR or an MSSP with a genuine response tier, not a SOC that only notifies. This is the most common and most expensive mistake: buying monitoring and discovering during an incident that nobody owns containment.
2. Which controls already exist?
If your firewalls, email security and patching are unmanaged, an MSSP that runs them delivers more risk reduction than MDR on top of chaos. If the basics are run well, MDR adds the detection depth you are missing.
3. What do your regulators and customers require?
NIS2 requires incident handling and 24-hour early warning; DORA requires detection and reporting for financial entities; ISO 27001 and SOC 2 require logging, monitoring and response evidence. Match the service to the clause, and ask the provider to show reports that satisfy it.
4. Who owns the tooling and the data?
A provider that runs its own platform is faster to onboard and harder to leave. A provider that manages your tooling keeps your data and your exit path in your hands. Decide this consciously; it determines the switching cost in three years.
Combining them without paying twice
Most mid-sized organisations end up with two of the three. These combinations work; the overlaps to avoid are listed with them.
- MSSP plus MDR: the MSSP runs controls and compliance reporting, the MDR provider owns detection and containment. Avoid paying both for SIEM monitoring of the same sources.
- SOC as a service plus internal responders: the SOC watches, your team acts. Only works with a real on-call rota on your side.
- MDR alone, for cloud-native companies with managed infrastructure: endpoints, identities and cloud telemetry covered; add vulnerability management separately.
- One provider for all three: simplest to manage, hardest to exit. Insist on your own tenant and data export rights.
- Whichever you choose: an annual penetration test from an independent party tests whether the whole arrangement actually detects and stops an attacker.
Where HackersHub fits
We deliver managed security services and managed detection and response as separate, combinable services, run by people who spend the rest of their week breaking into environments like yours. That offensive background shapes what we monitor and how we respond: we watch for the techniques we use ourselves. Both services are scoped per organisation, reported against the frameworks you answer to, and tested by our own red team so you know the detection works before an attacker checks for you.
Frequently asked questions
Not sure which model fits?
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