EDR vs XDR vs MDR: Differences and How to Choose

EDR vs XDR vs MDR looks like a choice between three products, but they are three different kinds of thing. EDR (endpoint detection and response) is software on laptops, desktops, and servers that records what each device does, flags suspicious behavior, and lets analysts isolate a device or stop a process. XDR (extended detection and response) widens the same idea to sources such as email, identity, and cloud. MDR (managed detection and response) is a service: an outside team that watches and responds for you, often using EDR or XDR tools. So the first question is not which acronym to buy, but who will read the alerts and act on them, including at night and on holidays.

What each one is

Vendors do not use these terms in exactly the same way, so the descriptions below are a starting point. Ask each vendor what its product actually covers.

• EDR: an agent (a small program installed on each device) collects activity such as process activity, file changes, and network connections, and looks for behavior that deviates from normal rather than only matching known malware. The team can respond on that device, for example by isolating it from the network, stopping a process, or removing a malicious file. EDR sees only the devices that run the agent
• XDR: a platform that takes data from endpoints and also from networks, cloud, email, and identity systems (the systems that manage accounts and sign-ins), groups related signals into one incident, and offers response actions such as isolating a device or disabling an account. It comes in two flavors: native XDR (unified within one vendor's products) and open XDR (connects tools from other vendors)
• MDR: a service, not a tool. The Canadian Cyber Centre lists MDR among the services of a managed security service provider (MSSP): monitoring, detecting, alerting, and managing the response to attacks. Scope differs by provider, so the contract matters more than the service name

These are not three steps of one ladder. An organization can run EDR itself, buy EDR together with an MDR service, run XDR itself, or have an MDR provider operate XDR. For how XDR relates to SIEM (log collection and correlation) and SOAR (response automation), read SIEM, SOAR and XDR Compared: Strengths and Limits. This article stays on the choice that starts from the endpoint.

What each one can and cannot see

Detection depends on the data a tool receives, so compare coverage rather than names:

• EDR sees only devices that run its agent: a device without the agent, a personal device, or a network appliance is invisible to it. Microsoft's explainer notes that EDR draws only on endpoint data
• An attack that never touches a device may not show up in EDR: for example, a stolen password used to sign in to email or a cloud service. The identity and email data that XDR adds can reveal such a case
• XDR is strongest on its own vendor's sources: coverage of other vendors' products varies, so ask which sources are connected natively
• MDR sees only what is connected to it: the provider's analysts can investigate only the data the tools send them. The Cyber Centre warns that a provider may not know about new systems or changes unless the organization says so

What MITRE ATT&CK Evaluations do and do not tell you

Vendors often cite MITRE ATT&CK Evaluations, tests in which MITRE runs emulated real attacker behavior against security products in a controlled environment. MITRE's FAQ, as read on 22 October 2026, says there are no rankings and no declared winners, and that taking part does not imply MITRE endorsement, ranking, or certification. The results show how a product performed in a standardized environment against specific attack scenarios, so they are one input to a decision, not the decision.

For the 2026 round, MITRE's methodology page uses a combined score called the Total Evaluation Score (TES) and suggests three questions to ask about any result:

• What is the score: TES combines a detection quality index (DQI) and a protection quality index (PQI), each from 0 to 1, so the total runs from 0.0 to 2.0. Look at both parts, because a product that detects well but protects little differs from one that protects well but detects little
• What is the modifier: a label after the score shows who produced the result. (P) means the product's automation (platform), so your team does the remaining work; (S/H) means human analysts from a service are included; (S/AI) means AI acts as the analyst. MITRE says a platform score and a managed-service score reflect different operating models and should not be compared directly
• What were the gaps: per-technique results show blind spots. A high total with gaps in techniques relevant to ransomware may not fit your risk

MITRE also lists what the evaluation does not measure:

• Cost or pricing models
• Ease of deployment and interface design
• Quality of support and response times
• Performance impact on devices and networks
• Effectiveness in your own environment

MITRE says TES scores cannot be compared with results from earlier years, because the 2026 round uses a new scoring method. Its FAQ also says that in the 2026 round each participant's results are delivered privately and MITRE publishes aggregated findings, while the methodology page refers to published per-technique results. What is public may differ by round, so ask the vendor which results are public and where to read them. MITRE suggests using results as one signal alongside a trial in your own environment, an assessment of support, and a total cost analysis.

When each one fits

These profiles are general starting points, not rules:

• A team that can watch alerts around the clock and respond itself: EDR or XDR as a platform may be enough, which matches MITRE's (P) label. MITRE's FAQ notes that a lower score from a pure platform can be the right fit for an organization with a strong internal SOC (security operations center)
• A small IT team with nobody on watch at night or on holidays: consider MDR. The Cyber Centre lists a lack of in-house resources or expertise, and a need for monitoring outside normal hours, as common reasons to use a managed security service
• Mostly one vendor's email, identity, and endpoint products: native XDR is the simplest to run, and an MDR service can be added to do the watching
• Many vendors and older systems you do not plan to replace: consider open XDR, or a SIEM at the center
• Regulated bodies, or data that must stay in a defined place: check where the provider stores logs and data and who can access them. The Cyber Centre lists data residency and auditing of access among the factors to assess

MDR changes who does the work, not who owns the risk. The Cyber Centre notes that hiring a provider puts security in outsiders' hands while the organization still owns the risk, and that providers are attractive targets, because one breach of a provider can reach the data of many clients. So agree before an incident who does each step.

Questions to ask providers

These questions suit any EDR, XDR, or MDR provider, drawn from guidance by the Canadian Cyber Centre, the UK NCSC, and CISA on choosing managed providers:

• Scope: which devices, accounts, and data sources are covered, and during which hours
• Who acts: which response actions the provider takes on its own (such as isolating a device from the network), which wait for your approval, and who on your side can approve at 3 a.m.
• Responsibilities matrix: is there a written document saying who does what
• Service levels: what the targets are for detection, response, and resolution, and whether you can see a sample SLA (service level agreement)
• Notification: how and how fast the provider tells you about an incident, including one that affects the provider itself
• Your data: where logs and device data are stored, for how long, who can access them, and whether you can export them when you leave
• The provider's access to your systems: whether it uses MFA (multi-factor authentication), gets only the permissions it needs (least privilege), and has its accounts removed when the contract ends
• After an incident: whether it helps with forensics and incident response, or only alerts
• Evidence: if it cites MITRE results, which round, which modifier, and which techniques were gaps

Common mistakes

• Reading MITRE results as a ranking: MITRE says there are no rankings and no declared winners
• Comparing a platform score directly with a score from a service that includes analysts: MITRE says they reflect different operating models
• Buying EDR and having nobody read the alerts: a tool that alerts at 2 a.m. with nobody on watch only records the attack
• Assuming an MDR contract moves the risk to the provider: the organization still owns the risk
• Installing the agent on only some devices: a device without the agent is invisible to EDR
• Not telling the provider about new systems: the provider cannot see what it has not been told about
• Forgetting to disable the provider's accounts when the contract ends: CISA warns this is easy to overlook when a contract terminates

Start today

• Count devices and agents: list every device, servers included, and mark the ones that already run an EDR agent
• Decide who responds out of hours: name the person or team for nights and holidays, and what they may do without asking for approval
• List what must be covered: devices, user accounts, email, and cloud services, in the priority order your organization chooses
• Draft a responsibilities matrix: who triages, investigates, isolates, and restores, for each option. The NCSC calls such a matrix good practice
• Test the shortlisted options in your own environment: MITRE suggests using results as one signal alongside a real trial
• Rehearse one scenario with an incident drill, see How to Prevent Ransomware: 5 First Steps for Organizations

EDR detects what gets through, and hardening (changing settings so a device offers fewer openings to attack) reduces what can get through. See Endpoint Hardening with CIS Benchmarks: Where to Start. To measure whether a provider makes you faster, track MTTD (mean time to detect) and MTTR (mean time to respond or resolve) as described in Using AI in the SOC to Reduce MTTD and MTTR.

To see where your endpoint detection and response stands, try the self-assessment.

Scope and accuracy

The MITRE statements come from the ATT&CK Evaluations FAQ and methodology overview as read on 22 October 2026; the Enterprise 2027 round was listed as in development. Provider guidance comes from the Canadian Cyber Centre (October 2022), the UK NCSC (November 2025), and the joint advisory AA22-131A from CISA and partner agencies (May 2022, now an archived page). The descriptions of EDR and XDR are general, not standards, because vendors use these terms differently. Confirm current details with each vendor before deciding.

Once you decide on an MDR service, see the selection steps in MDR: How to Choose a Provider, Without a Ranking.

Teams that already run EDR can use its data to hunt proactively; see Threat Hunting: What It Is and How to Start.

Detection tools work better with intelligence that has been evaluated; see Cyber Threat Intelligence (CTI) for Beginners.

References and further reading

• MITRE ATT&CK Evaluations: FAQ: no rankings and no declared winners, and how to use results in procurement
• MITRE ATT&CK Evaluations: Methodology Overview: the TES score, the modifier, and what the evaluation does not measure
• MITRE ATT&CK: the knowledge base of attacker techniques used as the reference for the tests
• Canadian Cyber Centre: Choosing the best cyber security solution for your organization (ITSM.10.023): MSSP and MDR services, benefits and drawbacks, and factors to assess
• UK NCSC: Choosing a managed service provider (MSP): responsibilities matrix, contracts, and the provider's access
• CISA AA22-131A: Protecting Against Cyber Threats to Managed Service Providers and their Customers: contracts, access, and log retention
• Microsoft: EDR vs. XDR: how scope and data sources differ
• Microsoft: What Is XDR?: XDR data sources, and native versus open XDR