Everything CISOs need to know about XDRs

The threat landscape is more complex than ever before and the attack surface of most enterprises is rapidly increasing. Cloud workloads, software-as a-service (SaaS) applications, remote endpoints and connected devices, among others, have created a patchwork of security data that is hard to track for a CISO.

Extended detection and response (XDR) solutions are the security market’s response to this ever-growing IT complexity.

The term XDR was coined in 2018 by Nir Zuk, founder and CTO of Palo Alto Networks, to describe an evolution of the more established endpoint detection and response (EDR) products but with a remit that extends beyond the endpoint.

An XDR platform is an integrated security technology that collects, correlates and analyses telemetry from multiple security layers, including endpoints, networks, email, cloud workloads, identity systems and applications. The goal is to deliver unified threat detection and response across an organisation’s entire digital environment.

In practical terms, this means unified visibility across an organisation's full digital surface, automated correlation of alerts and events that would otherwise appear entirely unrelated, centralised investigation from a single interface and coordinated response actions that can span multiple security domains simultaneously.

XDR should also be distinguished from managed detection and response (MDR), which is a service rather than a technology platform. Organisations that subscribe to MDRs essentially outsource their detection and response operations to a third-party security operations team that monitors their environment around the clock, investigates alerts and takes response actions on their behalf. 

The term XDR gained rapid traction across the industry, with vendors moving quickly to attach the XDR label to their offerings.

Gartner played a pivotal role in legitimising and defining XDR as a distinct market category, with analyst Peter Firstbrook among the first to formally recognise and articulate the XDR concept.

Today, Gartner defines XDR as a unified security incident detection and response platform that automatically collects and correlates data from multiple proprietary security components.

While Gartner does not publish a dedicated Magic Quadrant for XDR as a standalone category, the Magic Quadrant for Endpoint Protection Platforms (EPPs) largely covers the most popular XDR solutions on the market.

The latest version of the Quadrant, published in July 2025, placed CrowdStrike, Microsoft, SentinelOne, Palo Alto Networks, Trend Micro and Sophos as the leaders of EPP solutions.

Trellix and ESET are categorised as challenger, while Bitdefender is characterised as a visionary in its approach to XDR.

A few other vendors, like Fortinet, Check Point, WithSecure, Cisco, Cybereason and Broadcom are considered niche players in the XDR market.

XDR is relevant across a broad range of organisations, but it is particularly well suited to enterprises with complex, distributed environments, significant existing security investments that generate fragmented telemetry, and security operations teams that are struggling with alert volume and investigation depth.

While CISOs are not necessarily operating the XDR solution day to day, maintaining visibility into what it surfaces can be critical to their mission.

There are at least four core reasons CISOs should care about XDR. 

Modern threat actors have long since moved beyond single-vector attacks. They chain together techniques across email, endpoints, identity and cloud infrastructure in ways that are specifically designed to evade endpoint solutions and siloed detection tools. XDR's cross-domain correlation is architecturally suited to surface exactly these kinds of multi-stage, multi-vector attack chains. 

Security operations centres (SOCs) are drowning in alerts and the human cost of that noise is significant, contributing to analyst burnout, missed detections and even slow response times. XDR reduces that noise and elevates the quality of investigations. 

CISOs who have spent years managing a sprawling collection of point solutions, each with its own interface and its own data model, understand how much overhead that complexity creates. XDR offers a path toward consolidation without sacrificing capability. 

As regulatory requirements around incident detection and response continue to tighten globally, XDR provides the telemetry, audit trails and response documentation that supports board and executive accountability.

Choosing the right XDR solution is one of the most consequential technology decisions a CISO can make. Native XDR solutions from a single vendor offer tighter integration while open XDR platforms offer broader compatibility with existing tools. The right choice depends on the organisation's existing investments and appetite for vendor consolidation.

Once an XDR platform is in place, getting the most from it requires deliberate effort. A few things CISOs should prioritise:

• Ensure the platform is ingesting telemetry from all relevant sources, not just endpoints, or the organisation is simply running an expensive EDR solution
• Tune detection rules to reflect the specific threat actors and techniques most likely to target the organisation's industry
• Integrate XDR outputs into existing ticketing systems, playbooks and incident response workflows so detections translate into action
• Define clear performance metrics such as mean time to detect and mean time to respond and use them to drive ongoing improvement
• Use the consolidated visibility XDR provides as a strategic input into broader security investment decisions

For CISOs, XDR has become a critical tool for navigating this expanding and increasingly fragmented attack surface. By unifying visibility, detection and response across endpoints, cloud, identity and applications, XDR helps security leaders regain control over complexity, reduce investigative blind spots and improve operational efficiency.

In an environment where threats move laterally and regulatory and business pressures continue to rise, XDR equips CISOs with the ability to protect the organisation and make informed risk decisions.

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