Key Takeaways
- 48,174 new CVEs were published in 2025 — nearly 131 every single day. You cannot patch what you cannot see first.
- Agentless discovery scans your entire network using protocols like SNMP, WMI, SSH, and cloud APIs — no agent installation needed on each device.
- It covers what agent-based tools miss: IoT devices, OT systems, cloud workloads, network hardware, and unmanaged endpoints.
- 28% of vulnerabilities were exploited within 24 hours of disclosure in 2025. Continuous, real-time discovery is no longer optional.
- A hybrid approach (agentless for breadth, agent-based for depth) gives you the most complete security picture.
- Secure.com helps you map, monitor, and act on your asset inventory from one place — reducing manual scanning and eliminating stale spreadsheets.
Why You Cannot Afford Blind Spots Anymore
Picture this: your security team runs its quarterly scan. Everything looks fine. Two weeks later, a breach traces back to an IoT sensor in the office that nobody had inventoried. It never showed up because it did not support agent installation.
This is not a rare scenario. Security teams regularly deal with unmanaged devices, shadow IT, and cloud assets that traditional agent-based tools simply cannot reach. The result is a gap in visibility — and attackers know exactly how to find it.
According to vulnerability data from 2025, over 48,000 new CVEs were published that year alone. Nearly 28% were actively exploited within 24 hours of public disclosure. That means the time between a vulnerability being known and it being weaponized has shrunk to less than a day.
Agentless asset and vulnerability discovery is the approach that closes this gap — scanning everything on your network without requiring software to be installed on each device.
What Is Agentless Discovery and How Does It Work?
Agentless discovery scans devices across your network from a central location, using standard protocols to collect information remotely. No software sits on the target device. Nothing to install, nothing to maintain, nothing that can break.
Here is how it reaches different types of assets:
- Windows devices via WMI (Windows Management Instrumentation)
- Linux and Unix systems via SSH
- Network hardware like routers, switches, and firewalls via SNMP
- Cloud workloads in AWS, Azure, and GCP via native provider APIs
- IoT and OT devices via Deep Packet Inspection (DPI) and passive network monitoring
When an agentless scanner discovers a device, it can identify the make, model, operating system, patch level, open ports, running services, and known vulnerabilities, all without touching the device directly.
For cloud environments specifically, agentless tools use snapshot-based scanning. They take a read-only copy of a cloud volume, run the scan out-of-band, then delete the copy. The workload itself is never affected. No CPU overhead, no performance impact.
Agentless scanning captures a point-in-time snapshot of each resource. Because it reads data via APIs and scans out of band, the target environment experiences minimal performance impact — unlike traditional active scanning that can generate significant network traffic.
Compare this to agent-based discovery, where a piece of software must be installed on every single device. That means deployment campaigns, compatibility checks, update cycles, and the reality that some devices — IoT sensors, legacy OT systems, network appliances — simply do not support software agents at all.
Agent-Based vs. Agentless: Side-by-Side Comparison
Both approaches have their strengths. Here is a plain comparison:
| Feature | Agent-Based | Agentless |
|---|---|---|
| Deployment | Install software on every device | No installation. Scan via network/APIs |
| Coverage | Deep visibility into managed endpoints | All devices including IoT, OT, cloud, unmanaged |
| Offline Devices | Yes, stores data locally | No, only scans active devices |
| Data Depth | Full hardware, software, process detail | Network-level attributes, open ports, services |
| Cloud Support | Limited; needs agent on each VM | Native via cloud provider APIs |
| Performance Impact | Uses some endpoint resources | No impact on target devices |
| Best For | Servers, laptops, endpoint monitoring | Network infra, IoT, cloud, initial discovery |
| Maintenance | Agent updates, compatibility checks | Simpler to maintain centrally |
The bottom line: agent-based discovery gives you deep, continuous insight into managed endpoints. Agentless gives you wide, fast coverage of everything else. Most mature security programs use both.
For organizations that are just starting to build visibility, agentless is almost always the faster path. You can scan an entire network in minutes, with no pre-configuration required on individual devices. That matters when you are trying to build an accurate asset inventory from scratch.
Where Agentless Discovery Makes the Biggest Difference
There are four environments where agentless discovery clearly outperforms traditional methods:
1. IoT and OT Devices
IoT and operational technology devices are increasingly connected to corporate networks, but most do not support software agents. Some do not even respond to active network scans. Agentless tools using passive monitoring and DPI can identify these devices, classify them, and flag known vulnerabilities without disrupting their operation.
2. Cloud Environments
Cloud infrastructure is elastic. Resources spin up and down constantly. An agent-based approach cannot keep pace because every new VM or container would need an agent deployed before it is visible to your security team. Agentless cloud scanning works through provider APIs, giving you immediate visibility into new workloads as soon as they appear.
3. Remote and BYOD Devices
Employees working from home or using personal devices create coverage gaps in traditional agent deployments. Agentless network-level monitoring can identify these devices when they connect, validate their patch status, and flag risks — without requiring IT to touch each machine first.
4. Initial Asset Inventory
You cannot manage what you have not counted. For organizations that have never had a complete asset inventory, agentless scanning provides the fastest path to a full picture. One scan covers your entire network range and surfaces every active device.
A practical real-world example: An employee at a remote site connects a personal tablet to the company network. Passive agentless monitoring detects the device, identifies the OS and patch level, and correlates it against known vulnerabilities — enabling the security team to assess risk and take action if needed.
Continuous monitoring is what separates modern agentless tools from older periodic scanning. Point-in-time scans miss devices that are offline during the scheduled window. Real-time agentless monitoring catches everything as it connects.
How Secure.com Uses Agentless Discovery to Keep You Covered
Secure.com takes an agentless approach to asset and vulnerability discovery, built for environments where coverage and speed matter as much as depth.
Rather than asking your team to deploy and manage agents across hundreds or thousands of devices, Secure.com connects to your network and cloud environments directly. It maps your assets automatically, identifies vulnerabilities against current CVE databases, and surfaces the risks that need your attention first.
Key capabilities that come from the agentless approach:
- Full asset inventory across on-premise, cloud, and hybrid environments from a single dashboard
- Continuous scanning that detects new devices and configuration changes in near real-time, not on a fixed schedule
- Vulnerability correlation that maps discovered assets against known CVEs and prioritizes risks based on exploitability and business impact
- Coverage for device types that agents cannot reach: IoT, OT, network appliances, unmanaged endpoints
- Cloud-native scanning via AWS, Azure, and GCP APIs with no performance impact on your workloads
For teams that want deeper endpoint visibility, Secure.com also supports a hybrid model where lightweight agents can be added to specific high-priority systems. The agentless layer handles broad coverage; agents add depth where it counts most.
The goal is clear: minimize blind spots across your network. Agentless discovery is how you achieve comprehensive visibility at scale.
FAQs
Is agentless discovery less thorough than agent-based scanning?
Can agentless tools find devices that are powered off or disconnected?
How does agentless discovery handle cloud environments?
What credentials does agentless scanning need?
Final Thought
Most organizations are carrying more unknown risk than they realize because the devices generating that risk are simply not visible to their security tools. Agentless discovery is the fastest, most practical way to fix that.
It does not require a deployment campaign or compatibility testing. It works across cloud, IoT, OT, and traditional infrastructure. And it gives your team a real, up-to-date picture of what is on your network — which is the starting point for everything else in your security program.
Secure.com makes this process straightforward. Connect your environments, run your first scan, and see your full asset inventory within minutes. From there, vulnerability correlation and continuous monitoring keep that picture current as your environment changes.
