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XDR (Extended Detection & Response)
Definition
XDR extends EDR by integrating threat detection and response across multiple security layers: endpoints, network, cloud, and email. XDR correlates data from different sources for a holistic view of the attack.
Extended Detection and Response (XDR) is a security platform that integrates threat detection and response across multiple security layers: endpoints, network, cloud, email and identities. Gartner predicts that by 2027 over 40% of enterprise organisations will use XDR as their primary security solution, up from less than 5% in 2022.
How does XDR work?
XDR collects and correlates telemetry data from diverse sources: EDR agents on endpoints, network traffic analysis, cloud platform logs, email security systems and identity providers. By combining all these data sources in a central platform, XDR can detect attacks that would remain invisible to individual tools. An attacker who enters via a phishing email, moves laterally through the network and exfiltrates data to the cloud is recognised by XDR as a coherent attack chain rather than separate, unrelated events. Machine learning algorithms reduce false positives and prioritise the most critical threats.
Difference from EDR and SIEM
EDR is limited to endpoints and therefore misses attacks that traverse the network or cloud. SIEM collects logs but often lacks the context and automated response that XDR provides. XDR combines the best of both worlds: the broad visibility of SIEM with the deep endpoint analysis and automated response of EDR. Open XDR platforms integrate with security tools from different vendors; native XDR platforms work exclusively with the vendor's own tool stack.
Impact on organisations
The growing complexity of IT environments with hybrid cloud, remote working and IoT makes traditional point solutions inadequate. Security teams are overwhelmed with alerts from dozens of tools without a coherent overview. XDR solves this by providing a unified view across the entire attack surface. NIS2 requires organisations to implement appropriate detection measures covering the full IT environment. ISO 27001 emphasises the importance of integrated monitoring. The IBM Cost of Data Breach Report 2024 shows that organisations with XDR or equivalent integrated detection suffer on average $1.4 million less damage per incident.
Protection
XDR provides automated threat detection across all layers, integrated incident response with automatic isolation of compromised systems, and correlated threat intelligence that drastically reduces mean detection and response times. Effective XDR implementation requires a clear data strategy, integration with existing security tools and trained personnel.
How DEFION helps
DEFION delivers Managed Extended Detection and Response (MXDR) as a fully managed service. The 24/7 SOC team monitors the entire IT environment via XDR technology and responds directly to threats. Security Control Validation tests whether the XDR implementation actually detects the expected threats.