XDR vs. SIEM: Understanding the Core Differences

Tools like XDR and SIEM play a vital role in keeping systems secure. Understanding their differences can help you determine which one is the best solution for your organization. Let's dive in.

Cybersecurity is becoming critical these days as organizations face increasingly sophisticated threats. Tools like extended detection and response (XDR) and security information and event management (SIEM) play a vital role in keeping systems secure. While both XDR and SIEM offer vital support to the security team, these technologies differ significantly in their features, goals, and even how they operate.

Understanding these differences can help you determine whether XDR, SIEM, or both might be the best solution for your organization. Let’s dive in.

What Is XDR?

XDR involves gathering security information; running it through an analytics engine, which then detects malicious activities; and then, ultimately, responds to those activities. This system is offered by vendors in various architectures, including cloud-based, on-prem, and hybrid setups.

In another definition, XDR is an evolution of endpoint detection and response (EDR). EDR is employed on laptops, desktops, and other endpoint systems to block and prevent security incidents. So, XDR can be seen as threat hunting and investigation (i.e., proactively looking for problems and then responding to them). Furthermore, it reduces security sprawl, alert fatigue, and operational costs.

An XDR system

But what does an XDR system actually look like? Let’s take a closer look at this scenario between XDR and three other important systems: EDR, SIEM, and network detection and response (NDR).

In this scenario, we have

• an endpoint system and an EDR that talks to it;
• an NDR, which looks at security from the network perspective; and
• an SIEM that gathers information from sources such as databases, applications, and other security systems.

(As a side note, an SIEM can also gather information from an EDR and an NDR. But for this example, we’ll assume EDR, NDR, and SIEM are peer systems.)

All of these systems feed threat-related information to us from a number of different sources, telling us what’s going on in the security world at the moment. What we’d like to do is take all of that information and put it into a higher-level system. This is where XDR comes in.

Basically, the threat intelligence feed from the EDR, NDR, and SIEM are all put into the XDR. The XDR then takes the information from all these systems, correlates it, and gives you a single view of it. But XDR doesn’t just gather data; it also uses AI, machine learning, and advanced analytics to identify patterns and uncover hidden threats.

Security teams benefit from XDR’s ability to correlate events from multiple sources, which leads to fewer alerts and better detection of advanced threats. Additionally, it simplifies the job of a security analyst by providing a single place where you can view and manage all threat information. So, instead of toggling between multiple security tools, XDR consolidates everything into one place, allowing for quicker and more efficient threat detection and response.

What Is SIEM?

SIEM is a security solution that aggregates logs and data from multiple systems across an organization with the goal of providing real-time monitoring, correlation, and alerting based on rules and predefined configurations in one platform.

Hackers will always try to find that one vulnerability or weak link that they can take advantage of. To have full coverage, security analysts on the IT team are left fighting an uphill battle. They now have to deal with disconnected tools that don’t communicate with each other. So, they keep going back and forth, checking all these different tools, which create hundreds, if not thousands, of alerts daily.

This is where SIEM comes in: the one tool that outputs high-fidelity alerts. SIEM is a tool that pulls sources from several different places (such as NDR and EDR) within the network, aggregates the data, consolidates it, and sorts it to identify threats. It’s the one core threat protection technology that most organizations use in their war against hackers.

A SIEM system

SIEM can take logs, threat intel, vulnerability feeds, and data from your NDR and EDR. All of these get integrated into SIEM, where the magic happens. SIEMs (especially modern ones) are infused with AI, machine learning, and analytics, which they use to correlate all the log data collected and ultimately output high-fidelity alerts that are prioritized by severity or predefined thresholds. That way, you know which alerts need immediate attention.

Most organizations use SIEMs to maintain security visibility and meet compliance requirements by keeping detailed logs of all activities across their systems.

SIEM technology comes in two forms:

• Traditional SIEM: This version of SIEM mainly collects log data and generates alerts based on predefined rules. It provides valuable insights but will require human intervention to determine if a threat is real or a false positive.
• Next-gen SIEM: This is a modern version of SIEM that leverages AI and machine learning to analyze data, reduce false positives, and prioritize threats. It’s more accurate in detecting threats compared to traditional SIEM systems.

XDR vs SIEM: The Biggest Differences

Both XDR and SIEM aim to improve security, but they work in different ways. Here’s a simple breakdown of how they compare in terms of features, goals, capabilities, setup, and cost.

Features

• XDR collects data from different parts of your security system, like devices, networks, servers, and the cloud. It pulls everything together to help spot threats that might be missed by individual security tools. XDR gives a bigger picture of your security by connecting data from various sources.
• SIEM focuses on gathering log data from different systems in one place. It uses set rules to find suspicious activities and generates alerts. While SIEM is great at collecting and analyzing logs, it doesn’t provide the same wide view across security layers as XDR.

Goals

• XDR‘s main goal is to help security teams find and respond to threats faster. It reduces the number of alerts and gives more context to help teams understand potential risks better. XDR makes security work more efficient by showing a clear view of all possible threats.
• SIEM is more about monitoring events, managing logs, and meeting compliance rules. It helps businesses keep track of security events and gives insights into what’s happening across their systems. SIEM is often used to keep a record of security events for regulatory purposes.

Capabilities

• XDR combines data from multiple sources (like devices, networks, and cloud services) for a fuller view of threats. It uses AI to detect patterns and threats that older systems might miss. XDR also reduces alert overload by gathering everything in one place, making it easier to respond quickly to incidents.
• SIEM is great at collecting logs from different systems and finding security events based on set rules. It helps meet regulatory requirements by keeping detailed logs of all security events. It can store and analyze large amounts of data, making it a good option for bigger companies with complex security setups.

Setup

• XDR is easier to set up because it usually comes from one vendor and already has all the necessary built-in threat detection tools in place. It’s often cloud-based, making it simpler to use for small and medium-sized businesses.
• SIEM is more complex to set up because you have to connect various security tools and configure them to work together. It can take time and requires ongoing maintenance to keep everything running smoothly.

Cost

• XDR is usually more affordable for small and medium businesses because it reduces the need for many separate security tools.
• SIEM can be more expensive because it often requires additional tools and resources. Most SIEM vendors will charge you based on the amount of data, number of users, and connected devices. In addition to that, maintaining a SIEM system will always require rule updates along with hardware upgrades.

XDR vs SIEM: Critical Differences

Let’s take a closer look at the critical differences between XDR and SIEM.

Features	XDR	SIEM
Focus	Combines multiple security layers into one view	Manages events and logs data
Delivery model	Mostly cloud-based	Can be cloud-based or on-premises
Ease of use	Easier to set up and manage	Requires more setup and configuration
Threat detection	Uses AI to find threats	Based on preset rules
Alert Management	Reduces alert overload	Can generate a lot of alerts
Cost	More affordable for small businesses	Typically more expensive

Pros of XDR

XDR has a number of benefits:

• combines data from different security tools, making it easier to spot threats
• uses AI to detect complex threats more quickly and accurately
• reduces the number of unnecessary alerts, focusing on the most important ones

Pros of SIEM

SIEM also has benefits:

• gathers logs from many sources, giving a broad view of security events
• helps businesses stay compliant with regulatory requirements by keeping detailed records

Cons of XDR

While XDR is great at finding threats, it has some cons:

• doesn’t always offer the detailed logging and compliance tools that some organizations need
• may have all the advanced features bigger organizations need for full security monitoring

Cons of SIEM

SIEM, likewise, has its own drawbacks:

• setup can take a lot of time and resources to install, configure, and keep running smoothly
• can be pricey for smaller businesses, especially the newer versions
• generates so many alerts that it may overwhelm security teams, making it harder to focus on real threats

XDR, SIEM, or Both? Which Do You Need?

Your choice depends on your business needs and financial capability. XDR is a good option if you want a simple, cost-effective solution for detecting and responding to threats. It’s especially useful for small and medium-sized businesses that don’t want to deal with multiple security tools.

If your company needs detailed logs, compliance tracking, and the ability to grow with more complex systems, SIEM might be a better fit. SIEM is often better for larger companies with strict rules and more complicated security needs.

And in some cases, using the hybrid approach of both XDR and SIEM together can give you the most complete protection.

How SentinelOne Can Help?

SentinelOne offers a powerful XDR platform designed to protect endpoints, cloud, and identity resources using AI-powered technology. SentinelOne’s XDR platform leverages AI-powered technology to protect endpoints, cloud, and identity resources, unifying security data and automating critical tasks. Recognized as a leader by Gartner and MITRE, SentinelOne empowers security teams to break down silos, gain enterprisewide visibility, and prevent breaches. By using SentinelOne’s XDR, organizations can accelerate threat detection, improve response times, and simplify security management while reducing costs.

SentinelOne can also work alongside SIEM systems, helping businesses strengthen their security without losing the benefits of detailed log management and compliance.

Final Thoughts

Choosing between XDR and SIEM can be tricky, but knowing their differences can help you decide which one suits your business.

XDR focuses on wider security data sources and leverages AI to detect and respond to threats in a much faster way, while SIEM is more focused on gathering logs and correlating events, which is important for a business that needs detailed logs for compliance and large-scale monitoring.

It’s also worth noting that organizations can adopt the hybrid approach of integrating both tools—just like SentinelOne’s XDR, which can easily be integrated with existing SIEMs.

XDR vs. SIEM FAQs

Can XDR replace SIEM?

No, XDR doesn’t replace SIEM. Both of them have different purposes and can work alongside one another. XDR helps you with real-time threat detection across all the different parts of your security, while SIEM manages logs and is usually required for regulatory compliance. Moreover, many companies use both for better security.

Which is better for small businesses: XDR or SIEM?

XDR is usually better for small businesses because it’s much easier to set up (it’s provided by a vendor), requires less maintenance, and offers streamlined threat detection. SIEM, on the other hand, can be more costly and harder to manage, making it less practical for smaller businesses.

Is next-gen SIEM the same as XDR?

No, next-gen SIEM and XDR are different. While next-gen SIEM includes features like AI, it still focuses on log management and event correlation. XDR, on the other hand, integrates data from various security layers (like your devices, networks, and cloud) to provide a more complete view of threats and better response.