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What is the difference between MDR and EDR?
EDR is an endpoint-focused cybersecurity capability. NIST uses the expansion “Endpoint Detection and Response,” and CISA describes EDR as providing “cybersecurity monitoring and control of endpoint devices.” CISA’s CDM Technical Capabilities Volume 2, version 2.5 (2023) describes detection, response, follow-up, analysis, and integration with an organization’s response workflow.
MDR means “Managed Detection and Response,” according to NIST’s glossary. It describes a managed service relationship, not simply another name for endpoint software. A provider operates detection and response activities within the scope the customer has contracted for.
| Dimension | EDR | MDR |
|---|---|---|
| What it is | An endpoint detection and response capability. | A managed detection and response service. |
| Coverage emphasis | Instrumented endpoint devices and their activity. | Defined by the provider and contract; may include endpoint, network, or cloud signals. |
| Who operates it | Customer staff, automated policies, or a separately contracted provider may operate it. The acronym does not specify staffing. | Provider analysts operate the contracted service; customer responsibilities depend on the agreement and workflow. |
| Response | Can support or execute configured endpoint actions. | Provider investigates and may take actions authorized by the agreement. |
| Key buying question | Which endpoints and actions are supported, and who monitors alerts? | Which signals and hours are covered, which actions are authorized, and when is the customer contacted? |
What does EDR cover, and does it respond automatically?
Endpoint activity and alerts
EDR focuses on devices such as computers and servers that are instrumented with the relevant endpoint technology. It collects and monitors endpoint activity to help identify suspicious behavior, then supports investigation and response. The precise devices, telemetry, and capabilities vary by product and deployment.
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Configured actions are not the same as managed response
EDR can take configured actions such as isolating an endpoint or otherwise containing activity. Whether an action runs automatically, requires approval, or is available at all depends on product configuration and the organization’s policy. CISA describes configurable response capabilities, but also places EDR within an organization’s wider response workflow.
So, does EDR respond to threats automatically? It can perform configured technical actions, but that does not establish that alerts are continuously watched, investigated, or followed through by a person. An organization may operate the tool with its own staff, automated policies, or a separately contracted provider.
What does MDR add?
Provider-operated detection and investigation
MDR adds human operations: provider analysts monitor the telemetry included in the service, investigate potential threats, and perform response work within the agreed scope. A provider may also offer threat hunting, which proactively searches for signs of malicious activity.
Coverage is not uniform across providers. For example, Cisco describes its MDR offering category as managed threat detection, hunting, and response that may cover endpoints, networks, and cloud. That is a vendor example, not a universal definition of every MDR service.
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Response authority comes from the agreement
The MDR label alone does not tell you whether analysts may isolate a device, disable an account, block a connection, or take another action without approval. The service agreement and operating procedures should specify permitted actions, approval thresholds, escalation paths, notification expectations, coverage hours, and what the customer must do. The agreement also determines which assets and telemetry are in scope.
Who handles incident response with MDR?
With MDR, the provider handles the detection and investigation work assigned to it, and may perform response actions the customer has authorized. The customer still needs to know what falls outside that scope—for example, decisions requiring internal approval, actions on systems the service does not cover, or recovery work assigned to the organization. The exact division is contractual, not inherent in the acronym.
Without MDR, EDR may still contain a threat through automation, but human triage and incident coordination generally remain with the customer or another contracted response team. A tool’s ability to act on an endpoint should not be mistaken for ownership of the broader incident.
Incident-response practices vary with the technology and organization, as NIST notes on its Incident Response project page. NIST states there that SP 800-61 Revision 3 was finalized in April 2025, reinforcing why a single operational arrangement should not be assumed for every organization.
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How to compare an EDR deployment with an MDR service
Compare the actual offering and operating arrangement, not just the acronyms. Ask the provider or internal team to answer these questions in writing:
Quick Recap
- Assets and telemetry: Which endpoints, networks, cloud environments, and data sources are included? Which are excluded?
- Monitoring coverage: Are alerts reviewed continuously or only during specified hours? What happens outside those hours?
- Investigation and hunting: Who validates alerts, investigates incidents, and performs proactive threat hunting, if included?
- Containment and remediation: Which actions can the operator take, on which systems, and are they automatic, pre-authorized, or approval-gated?
- Escalation and approval: How and when is the customer notified? Who can approve actions, and what happens if the contact is unavailable?
- Response commitments: Are response targets defined, and when does the clock start? Ask which severity levels and service hours those targets apply to.
- Workflow integration: How do alerts, decisions, evidence, and handoffs fit the organization’s existing incident-response process?
- Customer responsibilities: Who owns recovery, communications, regulatory decisions, and work on systems outside the provider’s scope?
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