Managed security services (MSS) are outsourced cybersecurity functions—monitoring, threat detection, and incident response—delivered by a third-party provider. They let organizations extend their security capabilities without the cost and complexity of building everything in-house.
The company that delivers these services is called a managed security service provider (MSSP). This page covers both: what managed security services include, who provides them, what they cost, and where MDR fits.
Key takeaways
- MSS is a category, not a single service. It covers everything from managed firewalls to 24×7 threat detection and response.
- Scope sets the price and the outcome. Monitoring-only contracts cost less and send alerts back to your team. Services that investigate and contain threats cost more and do more of the work.
- A managed security service provider (MSSP) is the company that delivers MSS. Traditional MSSPs manage your tools and send you alerts, while MDR providers investigate and contain threats.
What is a managed security service provider (MSSP)?
A managed security service provider (MSSP) is a third-party company that manages and monitors an organization’s security tools and delivers outsourced security services, usually firewalls, intrusion detection, SIEM, endpoint tools, and log management.
Managed security services are the work. The MSSP is who does it. Managed detection and response (MDR) is one service model inside that category, and some providers offer both.
What an MSSP does
Most MSSPs are built around your tools. They deploy, configure, and monitor the controls you own or buy through them, then route what those tools find. Typical work includes firewall and endpoint tool management, log collection and retention, scheduled vulnerability scans, compliance reporting, and alert forwarding.
Detection usually comes from vendor-supplied rules and signatures running on the tools under management. Many MSSPs offer 24×7 uptime monitoring with business-hours analysis, so check which one you’re buying.
What an MSSP usually doesn’t do
An MSSP contract often stops at the alert. Investigating what happened, deciding whether it’s real, and fixing it stay with your team unless the contract says otherwise.
That works if you need tools managed and compliance evidence produced. It leaves a gap if you need someone to investigate and contain threats overnight.
MSS vs. MSSP vs. MDR
The three terms get used interchangeably in vendor marketing, but they describe different things: a category, a provider type, and a service model.
| MSS | MSSP | MDR | |
|---|---|---|---|
|
What the term refers to |
The umbrella category of outsourced security functions | The provider that delivers them, usually across a broad tool set | A specialized service inside MSS, focused on detection and response |
|
Primary job |
Extend security capacity you don’t have in-house | Keep security tools configured, running, and monitored | Find, investigate, and contain threats |
|
Typical scope |
Anything from firewall management to IAM to compliance reporting | Firewalls, IDPS, VPN, SIEM, endpoint tools, log retention | Endpoint, cloud, identity, network, email, and SaaS telemetry mapped to detections |
|
Detection approach |
Varies by service purchased | Mostly vendor-supplied rules and signatures on the tools under management | Custom detection engineering, behavioral analytics, and hypothesis-based threat hunting |
|
What happens on a real alert |
Contract-dependent | You get a ticket or escalation and your team investigates | Provider’s analysts investigate, confirm, and take or recommend containment actions |
|
Who owns response |
You, unless the contract says otherwise | You | Shared, with defined actions the provider executes directly |
|
Coverage |
Service-dependent | Often 24×7 uptime monitoring, with business-hours analysis | 24×7 analyst coverage |
|
Best fit |
Orgs filling a specific, defined gap | Orgs that need tools managed and compliance evidence produced | Orgs that need threats caught and stopped, not just alerts routed |
|
What you still own |
Whatever isn’t in scope | Investigation, triage decisions, and remediation | Environment ownership, business context, and sign-off on out-of-scope actions |
What do managed security services include?
Common managed security services include:
- Managed firewall: Configuration, rule management, and monitoring of firewalls
- Intrusion detection and prevention (IDPS): Network traffic monitoring, with the ability to block suspicious activity
- Vulnerability management: Regular scanning, prioritization, and tracking of fixes
- Security information and event management (SIEM): Log collection and analysis, often with 24×7 monitoring
- Endpoint security management: Administration of antivirus, anti-malware, and endpoint detection tools
- Identity and access management (IAM): Oversight of user identities, permissions, and access policies
- Email security management: Filtering for phishing, malware, and spam
- DDoS protection: Traffic filtering to keep online services available during an attack
- Threat intelligence: Collection and analysis of threat data, applied to your environment
- Incident response and remediation: Investigation, containment, and recovery when something real happens
- Compliance management: Support for controls, audits, and reporting
- Managed detection and response (MDR): Detection, investigation, and response by a team of analysts
Providers sell these one at a time or bundled, usually on a subscription.
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How is MDR different from other managed security services?
MDR is one service inside the MSS category. Most MSS keeps your security tools configured, running, and monitored. MDR does the detection and response work: building detections, investigating alerts, and containing threats.
The practical test is what happens when something real fires. With monitoring-focused MSS, you get a ticket and your team investigates. With MDR, the provider’s analysts investigate, confirm, and take or recommend containment actions.
| Monitoring-focused MSS | MDR | |
|---|---|---|
| Primary job | Keep tools configured, running, and monitored | Find, investigate, and contain threats |
|
Typical scope |
Firewalls, IDPS, VPN, SIEM, endpoint tools, log retention | Endpoint, cloud, identity, network, SaaS, and email telemetry mapped to detections |
|
Detection approach |
Mostly vendor-supplied rules and signatures | Custom detections, behavioral analytics, and hypothesis-based threat hunting |
|
On a real alert |
You get a ticket and investigate | Analysts investigate, confirm, and act or recommend |
|
Who owns response |
You | Shared, with defined actions the provider executes directly |
|
Best fit |
Orgs filling a specific, defined gap | Orgs that need threats stopped, not just alerts routed |
MDR services usually include:
- Threat detection: Analytics, machine learning, and threat intelligence monitor for threats in real time.
- Threat hunting: Analysts look for hidden or emerging threats that don’t trigger automated alerts.
- Incident investigation: Analysts work out the scope, impact, and nature of a confirmed threat.
- Response and remediation: The provider contains and neutralizes the threat, or recommends exactly how to.
- Continuous monitoring: Analysts watch your environment 24×7.
- Reporting: You get regular detail on threats found, actions taken, and ways to improve your posture.
Why do organizations use managed security services?
Security teams run short on people and long on alerts. The talent gap, plus alert fatigue, strains in-house teams. Managed security services fill specific gaps without a hiring plan.
Benefits of managed security services
- 24×7 coverage without a 24×7 team. A round-the-clock internal rotation takes eight to ten analysts before turnover.
- Faster detection and containment. Proven detection methods and automated response workflows shorten the time from alert to action.
- Current detection content. A provider maintains detections and threat intelligence across its whole customer base.
- Less noise. Triage handled externally means your team spends its time on real threats.
- Compliance evidence. Systematic monitoring and documented response produce what most frameworks require.
- Coverage that grows with you. Add log sources and attack surfaces without adding headcount.
What is managed detection and response in managed security services?
Managed detection and response (MDR) is a specialized service within the broader category of managed security services. It focuses on the proactive detection, investigation, and response to threats in an organization’s environment. Unlike traditional security services that may rely heavily on automated tools, MDR combines advanced technology with human expertise to identify and respond to sophisticated threats that might evade standard defenses. Partnering with an MSSP that offers MDR provides organizations with enhanced threat detection capabilities.
How much do managed security services cost?
Pricing varies a lot because the category is so broad. A managed firewall and a 24×7 SOC are both MSS, and they don’t cost anything alike. Three things set your number: how the provider charges, what’s in scope, and what the provider does when something real happens.
Common pricing models
- Per endpoint or user: Easy to budget, but cost grows with devices and identities. Per-user pricing can run cheaper if your people carry more than one device.
- Data volume: Common with SIEM-based services. Your bill tracks how much log data you send, so one noisy source can blow up the budget.
- Flat tier: A fixed fee for a defined scope. It’s predictable, but ask what happens when you outgrow the tier.
What moves the price
- How many log sources and tools you onboard
- How many attack surfaces you want covered—endpoint, cloud, identity, SaaS, network, and email
- Whether response actions are included or billed as separate incident work
- Onboarding, data retention, and add-on services like threat hunting or phishing
- Contract length and how easily you can change coverage mid-term
Monitoring-only contracts cost the least. Services where analysts investigate and contain threats cost more, because someone is doing the work you’d otherwise do yourself. Compare quotes on the same scope. A cheaper quote that routes every alert back to your team isn’t cheaper if you still have to staff the investigation.
Ask what’s excluded, not just what’s included. The gaps are where unplanned spend shows up.
How Expel prices MDR
Expel MDR comes in three packages—Starter, Select, and Premium—scoped by the coverage you need and the size of your organization. Every package includes 24×7 SOC coverage, Expel Workbench™ access, and auto remediation, with no separate fees for analyst time or incident escalations. See Expel MDR packages or read our deeper breakdown of MDR pricing and cost.
How to choose a managed security service provider
Every provider will say they’re 24×7 and expert-led. These six questions get past the pitch.
- What gap are you filling? Name it first: 24×7 coverage, cloud visibility, compliance evidence, or response capacity. Providers optimize for different ones, and a provider that’s great at compliance reporting may be weak at response.
- What can they do without asking you? Get specific about response authority. Can they isolate a host or disable an account overnight, or do they open a ticket and wait? The answer tells you whether you’re buying response or notification.
- How do they build and maintain detections? Vendor-default rules age badly. Ask who writes detections, how often they’re tuned, and how many are custom to the provider.
- Will they work with the tools you already have? A provider that makes you rip and replace adds cost and risk. Check coverage for your actual stack: endpoint, cloud, identity, SaaS, and SIEM.
- Can you see the work as it happens? Ask whether you can watch investigations in progress and see why a decision was made. A monthly report doesn’t show that.
- How do they measure themselves? Ask for time to detect and time to respond, how those numbers are calculated, and which incident severities they cover. Be wary of averages that hide the slow cases.
Then ask for references from companies your size and ask what the first 90 days looked like. Onboarding tells you a lot about how the relationship will go.
If you’re comparing an MSSP against MDR, start with what’s the difference between MDR vs. SOC or see how Expel stacks up on the compare page.
How Expel approaches managed security services
Expel® Managed Detection and Response (MDR) covers detection and response, threat hunting, managed phishing protection, and vulnerability prioritization as one service. Our API-driven approach works with the security tools you already have.
Expel Workbench™, our security operations platform, uses AI to cut false positives, correlate high-priority alerts, and add context before an analyst touches them. Our mean time to respond is 13 minutes on high/critical incidents with auto remediation, and you can watch every investigation as it happens.
Additional resources
- What is SOC-as-a-service (SOCaaS)?
- What’s the difference between MDR vs. SOC?
- What is managed detection and response (MDR)?
Frequently asked questions (FAQs)
What are managed security services?
Managed security services are cybersecurity functions you outsource to a third-party provider instead of staffing them internally. That covers a wide range—firewall and endpoint management, vulnerability scanning, SIEM monitoring, identity and access management, email security, threat intelligence, compliance reporting, and incident response. Providers deliver them individually or bundled, usually on a subscription. The category is broad enough that two providers can both call themselves managed security services and do almost nothing alike, which is why scope matters more than the label.
What’s included in managed security services?
Common services include managed firewall, intrusion detection and prevention, vulnerability management, SIEM monitoring, endpoint security management, identity and access management, email security, DDoS protection, threat intelligence, compliance management, incident response, and MDR. What you actually get depends on the contract, so check what’s in scope and what’s excluded.
What are the benefits of managed security services?
The main one is round-the-clock coverage without hiring for it. You also get detection content and threat intelligence a provider maintains across its customer base, external alert triage that frees your team for real threats, and the monitoring and response records most compliance frameworks require.
How much do managed security services cost?
Pricing usually keys off endpoints or users, data volume, or a flat tier tied to a defined scope. Monitoring-only contracts cost the least. Services where analysts investigate and contain threats cost more. The biggest variables are how many log sources you onboard, how many surfaces you cover, and whether response is included or billed as incident work.
What’s the difference between managed security services and MDR?
Managed security services are the category, and MDR is a service inside it. Most managed security services keep your tools running and forward alerts to your team. MDR does the detection and response work: custom detections, investigation, and containment.
What’s the difference between managed security services and an MSSP?
Managed security services are what gets delivered. An MSSP is the provider that delivers them.
What is a managed security service provider (MSSP)?
An MSSP is a third-party company that manages and monitors security tools on your behalf. Typical services include firewall management, log monitoring, vulnerability scanning, and alert forwarding. The MSSP runs the controls, and your team usually handles investigation and response.
What does MSSP stand for?
MSSP stands for managed security service provider. The services it delivers are called managed security services (MSS).
