What is a managed security service provider? A managed security service provider, or MSSP, is a company that runs part or all of another organization's cybersecurity for a recurring fee. It monitors systems, looks for threats, responds to incidents and helps with compliance, so customers do not have to build and staff that capability themselves.
Where a general managed service provider keeps IT running, an MSSP keeps it protected. The two overlap, and many providers do both, but the focus is different. This guide explains what MSSPs do, how they work, how they differ from MSPs and from MDR services, who uses them, and how to choose one.
What does an MSSP do?
The exact service list varies, but most MSSPs offer some mix of:
- Security monitoring. Watching logs and alerts from networks, endpoints, email, identities and cloud services, usually around the clock.
- Threat detection and response. Investigating alerts and helping contain real incidents.
- Firewall and network security management. Configuring, updating and watching perimeter and internal defenses.
- Vulnerability management. Scanning for weaknesses and tracking fixes.
- Endpoint protection management. Running and tuning protection on laptops and servers.
- Email and web security. Filtering phishing, malware and risky sites.
- Identity and access support. Helping control who can reach what.
- Compliance support. Evidence, reports and guidance against the standards that apply to you.
- Incident response and forensics. Help during and after a breach.
- Security awareness training. Teaching staff to spot attacks.
How does an MSSP work?
- Assess. The provider reviews your systems, data and risks.
- Onboard. It connects tools and data sources, and agrees what it may do on your behalf.
- Monitor. Analysts and software watch for threats continuously.
- Respond. Real incidents are investigated and contained under agreed rules.
- Report. You receive regular summaries of activity, risks and recommendations.
- Improve. Findings feed into changes to your defenses.
Most MSSPs work from a security operations center, a team and set of tools that handle monitoring and response. Some run their own. Others rent capacity from a larger provider.
How is an MSSP different from an MSP?
| Point | MSP | MSSP |
|---|---|---|
| Main goal | Keep IT running well | Keep systems and data protected |
| Typical work | Helpdesk, patching, backup, networks, cloud | Monitoring, detection, response, vulnerability and compliance work |
| Success looks like | Few outages, happy users | Fewer, shorter security incidents |
| Staff skills | Systems and support engineers | Security analysts and engineers |
| Overlap | Many MSPs add basic security | Many MSSPs also manage IT |
For more on this, read our guide to MSP vs MSSP.
How is an MSSP different from MDR?
Managed detection and response (MDR) is a focused service that detects and responds to active threats. An MSSP offers a wider set of security services, and MDR is often one of them. Some organizations buy MDR alone. Others buy an MSSP that includes it, plus management of firewalls, scanning and compliance reporting.
Who uses an MSSP?
- Organizations without a dedicated security team.
- Companies that must show monitoring to a regulator, insurer or customer.
- Businesses that cannot cover nights and weekends.
- Organizations adding security as their IT environment grows.
- MSPs that resell security services to their own customers, often by partnering with an MSSP.
What are the benefits and limits?
Benefits
- Access to skills and tools that are costly to build in house.
- Coverage outside business hours.
- A predictable monthly cost.
- Experience drawn from many customers.
- Help with evidence for audits and questionnaires.
Limits
- You still own your decisions and your risk.
- Coverage depends on which systems are connected.
- Quality varies widely, so claims need checking.
- Basic hygiene, such as patching and backups, remains essential.
How do you choose an MSSP?
- Define what you need. Monitoring, response, compliance support, or all three.
- Ask what is included. Get the service list and the exclusions in writing.
- Check the response model. Find out what the provider can do without asking you.
- Ask about analysts. Who watches, when, and from where?
- Review reporting. Ask to see a sample.
- Ask about standards. Which assessments or certifications do they hold?
- Talk to customers like you. Check size, industry and country.
- Read the exit terms. Make sure you keep your data and history.
Our US buyer's guide, how to shortlist an MSSP, walks through this in more detail.
What does the MSSP market look like?
MSSPs range from specialist security firms to MSPs that added a security practice. Some serve one industry or one country. Others are global. Our database covers about 50,000 MSSPs across 60+ countries, and you can browse them on our managed security service provider list or on the page for MSSP companies in USA.
Related reading
- what is managed detection and response: the focused detection and response service.
- compliance, governance and risk management explained: the governance, risk and compliance side.
- what is a managed service provider: the general IT provider model.
- MSP vs MSSP: which one you need.
Where to go next
An MSSP gives you outside security staff, tools and monitoring for a recurring fee. If you are choosing a provider, begin with our shortlisting guide. If you sell to MSSPs, request a free 100-record sample of verified MSSP contacts.
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