EDR vs XDR: key differences, and where MDR fits

EDR (endpoint detection and response) monitors devices such as laptops and servers and lets you investigate and contain threats on them. XDR (extended detection and response) applies the same logic across endpoints, network, cloud, email and identity, and correlates their signals. Both are technologies. MDR (managed detection and response) is a service: analysts who run those tools for you.

So the real comparison is EDR vs XDR, two scopes of the same technology, and then a separate question: who reads the alerts. This guide is for IT managers and CISOs in European mid-market organisations who are comparing offers, renewing an endpoint licence or deciding whether to bring in a managed service. It covers what each term means, where they differ, how they work together and what NIS2 and DORA say about detection.

Why the three acronyms get mixed up

All three end in "detection and response": notice that something is wrong, then act on it. That shared root is the core of modern security operations, which moved from blocking known malware to spotting suspicious behaviour and reacting quickly.

The first letter is where they split. The E in EDR stands for endpoint, a scope. The X in XDR stands for extended, a wider scope. The M in MDR stands for managed, and that changes the question entirely: it is no longer about where you look but about who is looking. The first two describe a technology, the third describes a way of delivering it.

What EDR does

An EDR tool puts a lightweight agent on each endpoint: desktops, laptops, servers, sometimes virtual machines and cloud workloads. The agent records what happens on the machine (processes starting, files changing, network connections, commands run) and sends that telemetry to a console that flags suspicious patterns.

The difference from traditional antivirus is the approach. Antivirus blocks malware it recognises. EDR looks at behaviour, so it can surface an attack that uses no known malware, for example an intruder running legitimate admin tools with stolen credentials. The response part means you can act from the console: isolate a machine from the network, kill a process, quarantine a file, collect evidence for an investigation.

Where EDR stops

EDR sees the endpoint and little else. An attacker who logs in through a compromised cloud account, moves through email or abuses an identity provider may never touch an EDR agent in a way that looks unusual.

Configuration matters as much as scope. In February 2024, CISA, the NSA, the FBI, other US agencies, the UK National Cyber Security Centre and partner agencies in Australia, Canada and New Zealand published joint guidance on living off the land techniques, where attackers use tools already present on the system. One of the common gaps it lists is organisations that rely predominantly on untuned endpoint detection and response (EDR) systems, which may not alert to this activity. The guidance notes that EDR vendors may treat built-in system binaries as safe, and that administrators sometimes ask for configurations that allow them.

What XDR adds

XDR takes the detection and response logic beyond the endpoint. It collects telemetry from several layers (endpoints, network, cloud workloads, email, identity) and correlates it in a single platform, with shared investigation and response.

The value is the correlation, not the volume of data. A login from an unusual country, a mailbox rule that forwards invoices and a new process on a finance laptop can each look harmless on its own. Read together, they describe an account takeover. The same joint guidance makes the point in general terms: detecting living off the land activity requires contextual analysis of multiple data sources to tell malicious commands, file interactions and privilege escalations apart from normal administrative work.

Native and open XDR

Offers fall roughly into two models. Native (single-vendor) XDR correlates data from one vendor's own endpoint, email, identity and cloud products: integration is tight, but coverage depends on how much of that vendor's stack you run. Open (or hybrid) XDR ingests data from third-party tools you already have. Neither is better in the abstract. The question is how much of your environment each one would actually see.

EDR vs XDR: the differences that matter

• Scope. EDR covers endpoints. XDR covers endpoints plus some combination of network, cloud, email and identity.
• Data sources. EDR relies on its own agent. XDR combines its agent with other telemetry, either from the same vendor or through integrations.
• Correlation. EDR alerts describe what happened on one machine. XDR groups related alerts from different layers into a single incident, which reduces the number of separate tickets an analyst has to join by hand.
• Response actions. EDR acts on the device: isolate, kill, quarantine. XDR can also act on other layers, for example disabling an account, revoking sessions or pulling an email from every inbox.
• Effort to run. Both need tuning and someone to read the alerts. XDR needs more integration work up front, and pays it back in environments spread across cloud, SaaS and remote users.
• When it fits. EDR is the baseline for any organisation with endpoints. XDR earns its place when most of your risk sits outside the endpoint, in identities, mailboxes and cloud accounts.

In practice XDR is not a replacement for EDR. Many XDR platforms are built on an EDR component, so the choice is usually whether to stop at the endpoint or extend the same tooling further.

Where MDR fits

MDR answers a different question. EDR and XDR are what you detect with. MDR is who does the detecting and responding, and how continuously.

An MDR provider runs the tools on your behalf: it tunes the rules, triages the alerts, investigates, hunts for threats and takes the response actions you have authorised in advance, usually around the clock. Some providers bring their own EDR or XDR, others work on the tools you already own. Either way, MDR sits on top of the technology, it does not replace it.

MDR is also not the same as an MSSP. MSSP names the type of provider, which may or may not include investigation and response. Our guide to choosing an MSSP explains how to read the service description behind the label.

How they work together: an example

An EDR agent on a laptop flags an unusual PowerShell command. The XDR platform links it to a sign-in from a new location on the same user's account and to outbound traffic towards an unfamiliar domain, and raises one incident instead of three alerts. An MDR analyst receives the incident at 2 a.m., confirms it is real, isolates the laptop, disables the account and calls your on-call contact.

The tools collected and correlated. A person decided and acted. That division of work is what makes detection and response function in practice.

XDR vs SIEM

A SIEM is the other platform that often appears in the same conversation. A SIEM collects logs from almost any source (applications, firewalls, cloud services, identity, EDR and XDR themselves), keeps them for long periods and lets analysts write their own detection rules and search across everything. XDR works on a narrower, curated set of telemetry with built-in detections and response actions.

Many organisations run both: XDR or EDR for fast detection on the layers it covers, a SIEM for full visibility, long-term retention and the audit trail that regulators ask for. Our overview of SIEM tools covers how to compare them, and the Microsoft Sentinel vs Google SecOps comparison looks at two cloud SIEMs in detail.

What NIS2 and DORA expect

Neither law names EDR, XDR or MDR. They describe outcomes, and leave the tooling to you.

• NIS2. Directive (EU) 2022/2555 lists incident handling among the minimum cybersecurity risk-management measures (Article 21(2)(b)). For the digital providers listed in its Article 1, including DNS, cloud computing and data centre service providers, managed service providers and managed security service providers, Commission Implementing Regulation (EU) 2024/2690 goes further. Its Annex, point 3.2, asks for procedures and tools to monitor and log activity in order to detect events that could be incidents, monitoring that is automated where feasible and keeps false positives and false negatives low, and synchronised time sources so logs can be correlated across systems.
• DORA. Regulation (EU) 2022/2554 requires financial entities to have mechanisms to promptly detect anomalous activities (Article 10(1)), with multiple layers of control and alert thresholds that trigger incident response (Article 10(2)), and to devote sufficient resources and capabilities to monitor user activity, ICT anomalies and incidents (Article 10(3)).

Two points follow. Correlation across layers and synchronised logs, which is what XDR and SIEM do, maps closely to these texts. And DORA's mention of resources and capabilities is a reminder that a tool nobody watches does not meet the requirement on its own. More on each framework on our NIS2 and DORA pages.

Three misconceptions

• "We have EDR, so we are covered." EDR is a strong source, but it sees only the endpoint, and it produces signals someone has to read. Left untuned and unwatched, it fills a console nobody opens.
• "XDR is just EDR with better marketing." The difference is cross-layer correlation. The value is not more data, it is reading together signals that look harmless apart.
• "MDR or EDR, pick one." They are not alternatives. One is a technology, the other is a service that runs it. The real choice is whether to run detection and response in-house or hand it to a provider.

How to choose

Start from two questions rather than from acronyms.

1. Where does your risk sit? If most of it is on laptops and servers, a well-tuned EDR is the foundation. If your environment is spread across cloud, SaaS applications and remote identities, XDR correlation, or EDR combined with a SIEM, will catch what an endpoint view misses.
2. Who will read the alerts at night? A tool without people produces alerts nobody acts on. If you do not have an internal security team with 24/7 cover, an MDR or managed SOC service gives you the technology and the analysts together.

When you compare offers, ask each vendor or provider the same things: which data sources are covered out of the box, which response actions can be automated and which need approval, how detection rules are tuned to your environment, and who owns the data and the rules if you leave.

In short: EDR detects and responds on endpoints, XDR extends that to network, cloud, email and identity and correlates the signals, and MDR is the managed service that runs these tools with analysts around the clock. They fit together rather than compete. AmagisTech runs 24/7 detection and response on Google Security Operations with Mandiant threat intelligence, integrating the systems you already have. See how it works on our observability and SecOps page.