MSSP vs MDR
Alert forwarding versus active investigation and response.
An MSSP (managed security service provider) monitors your security tools and forwards alerts for your team to investigate. MDR (managed detection and response) goes further: a provider’s own analysts investigate each alert and respond directly, including containment. The difference is who does the investigating: an MSSP hands you the alert, MDR resolves it.
The short answer
An MSSP (managed security service provider) monitors your security tools and forwards alerts for your team to investigate. MDR (managed detection and response) goes further: a provider’s own analysts investigate each alert and respond directly, including containment. The difference is who does the investigating: an MSSP hands you the alert, MDR resolves it.
An MSSP manages a broad set of outsourced security products, such as firewalls, antivirus and SIEM platforms, and monitors the alerts they generate. When something looks suspicious, the MSSP typically forwards it to the customer’s own team to investigate and decide what to do.
- Manages and monitors security tools on the customer’s behalf
- Forwards alerts rather than confirming which ones are real
- Investigation and response usually fall back to the customer
- Often priced per device, log source or tool managed
MDR is a service in which a provider’s own analysts investigate and actively respond to threats around the clock, rather than just monitoring tools and passing alerts on. It combines detection technology with the humans needed to act on what it finds.
- Analysts investigate each alert before it reaches you
- Active response, including containment, not just notification
- Includes threat hunting and incident response as standard
- Priced as an outcome-based service, not per tool managed
Key differences
Where MSSP and MDR diverge, at a glance.
| Dimension | MSSP | MDR |
|---|---|---|
| Scope | The tools and log sources it monitors | Endpoint, network, identity and cloud, correlated |
| Response model | Forwards the alert for you to act on | Investigates and acts directly, including containment |
| Who investigates | Your own team, once the alert reaches them | The provider’s analysts, before it reaches you |
| Pricing model | Often per device, log source or tool managed | An outcome-based service, usually per endpoint |
| Best for | Teams that already have analysts to triage what’s forwarded | Teams that want threats resolved, not just reported |
When to choose which
A traditional MSSP model can work when an organisation already has the analysts and time to investigate every alert it is sent, and mainly needs help managing the underlying tools rather than deciding what to do with their output.
MDR fits organisations that want confirmed, contained incidents rather than a stream of alerts to work through themselves, and that do not have the staff to investigate around the clock.
The terms are converging rather than competing, because many providers now sell both under one roof. An organisation that starts with tool monitoring often finds it needs the investigation and response layer added on top, at which point it has effectively bought MDR whatever the contract calls it. The distinction that matters is not the label but where the work of deciding whether an alert is real, and doing something about it, actually happens.
A worked example: the alert that gets forwarded, and the alert that gets resolved
A SIEM tool flags an unusual sign-in to a cloud admin console at two in the morning, from a location the account has never used before. Under a traditional MSSP arrangement, that alert is forwarded, by email or a ticket, to the customer’s on-call contact. Someone now has to wake up, work out whether the sign-in is genuine, check what the account touched, and decide whether to disable it, all before the attacker does any more damage.
Under MDR, an analyst has already looked at the same alert by the time the customer hears about it. They correlate it with other signals, confirm it is not a false positive, and take action directly, such as suspending the session and disabling the account, before calling the customer with a contained incident rather than a question. The underlying detection tooling can be identical in both cases. What differs is who does the work between the alert firing and someone acting on it, and how many hours pass in between.
Why the line is blurring: MSSPs that now sell MDR
The distinction is getting harder to spot from a datasheet, because many long-standing MSSPs have added investigation and response teams and now market the result as MDR. That is not necessarily a problem: a provider that has genuinely built human-led investigation and response capability has become an MDR provider in substance, whatever it was called five years ago.
The problem is where the label changes but the delivery does not, and a monitoring service is relabelled MDR without the analyst capacity or response authority to back it up. The way to tell the difference is not the name on the contract but two specific questions: does the provider’s own team investigate an alert before you ever see it, and can they take containment action directly, within limits you have agreed, rather than only telling you what they found.
How to evaluate which one you are actually being sold
Ask what happens between an alert firing and a human looking at it. If the honest answer is that alerts queue for your team to work through, whatever it is called, that is an MSSP model, and it works only if you have the analysts and the hours to run it. If a provider’s own team investigates first and escalates only confirmed threats, that is MDR, and the value is in the hours it saves your team rather than the technology underneath.
Also ask what is included at each tier, since incident response is sometimes sold as a separate retainer on top of monitoring. Precursor’s MDR includes full incident response as standard at every tier, with pricing from £900 a month depending on endpoint count and log sources, so there is no separate retainer to negotiate once an incident is confirmed. Whichever provider you compare it against, get that scope, and the response authority they hold, agreed in writing before you sign.
Not sure which you need?
The right detection stack depends on your environment, your team and your risk. Precursor operates managed detection and response from a CREST-accredited security operations centre, so you get the outcome rather than another tool to run.
MSSP vs MDR, answered
Common questions about how MSSP and MDR differ and relate.
No. An MSSP typically monitors your security tools and forwards alerts for your own team to investigate. MDR goes further: the provider’s analysts investigate each alert themselves and respond directly, including containment. An MSSP reports the alert; MDR resolves it.
Some can. Many traditional MSSPs have added investigation and response capability and now market the result as MDR, which is why the two terms increasingly overlap. What matters when comparing providers is not the label but whether analysts investigate before you see the alert and whether the provider can take containment action directly.
It depends on what your MSSP actually does once an alert fires. If alerts are forwarded for your team to investigate and your team has the capacity to do that around the clock, the MSSP model may be enough. If alerts sit unreviewed outside office hours, that gap is exactly what MDR is designed to close.
An MSSP manages a broad set of outsourced security products and monitors the alerts they generate, typically forwarding anything suspicious to the customer to investigate. MDR combines detection technology with a provider’s own analysts, who investigate each alert and respond directly, including containment, rather than just passing it on.
Not necessarily. MSSP pricing is often per device, log source or tool managed, while MDR is typically priced as an outcome-based service per endpoint, with investigation and response included. Comparing like for like means checking whether incident response is bundled into the MSSP price or billed separately when you need it most.
A security operations centre is the function of continuously monitoring, detecting and responding to threats. MSSP and MDR are two ways of buying that function from a provider: an MSSP typically manages tools and forwards alerts, while MDR provides a provider-operated SOC that investigates and responds on your behalf around the clock.
Ask two questions. Does the provider’s own team investigate and confirm an alert before it reaches you, or does it arrive as raw output for your team to work through? And can the provider take containment action directly, within agreed limits, rather than only notifying you? A provider that only monitors and forwards is an MSSP regardless of what the service is called.