Agentless Scanning: API-Based Cloud Security Without Installing Agents
Agentless cloud security scanning uses cloud APIs to assess security posture without deploying agents on workloads — faster to deploy, no performance overhead.
What is Agentless Scanning?
Agentless cloud security scanning assesses your cloud infrastructure’s security posture using cloud provider APIs rather than installing software agents on individual workloads. Instead of deploying a binary on every EC2 instance, container, or VM, the scanner authenticates to the cloud API and reads configuration data directly.
You grant read-only access (an IAM role, service account, or service principal), and the scanner queries the cloud control plane to evaluate security across all your resources. No packages to install, no daemons to manage, no kernel modules to update.
Why It Matters
The agent vs. agentless debate has a clear winner for configuration security:
Deployment speed — Agentless scanning goes from zero to first results in minutes. Agent-based approaches require rollout across every workload, which can take weeks in large environments.
Coverage completeness — Agents only see hosts they’re installed on. Miss one and you have a blind spot. Agentless scanning discovers every resource the API can see — including resources you didn’t know existed.
Operational overhead — Agents consume CPU, memory, and disk. They need updates. They can crash. They sometimes conflict with other software. Agentless scanning has zero impact on workload performance.
Ephemeral workloads — Containers, serverless functions, and auto-scaled instances may live for seconds. Installing agents on ephemeral infrastructure is impractical. API-based scanning doesn’t care about workload lifespan.
How It Works / Key Concepts
Agentless Architecture
- Authentication — The scanner assumes a read-only IAM role (AWS), uses a service account key (GCP), or authenticates via service principal (Azure)
- Discovery — API calls enumerate all resources: compute instances, storage, databases, networking, IAM, etc.
- Configuration retrieval — For each resource, the scanner reads its configuration via cloud APIs
- Evaluation — Configurations are checked against security rules (CIS Benchmarks, custom policies)
- Reporting — Findings are generated with severity, resource identifiers, and remediation guidance
Agentless vs Agent-Based
| Capability | Agentless | Agent-Based |
|---|---|---|
| Deployment time | Minutes | Days to weeks |
| Performance impact | Zero | CPU/memory overhead |
| Configuration scanning | Excellent | Limited |
| Runtime threat detection | Limited | Excellent |
| File-level scanning | Via snapshots | Direct access |
| Network traffic analysis | No | Yes |
| Coverage completeness | Full (API-visible) | Only where installed |
When You Still Need Agents
Agentless scanning excels at configuration and posture assessment. But some security capabilities require workload-level access:
- Runtime threat detection — Detecting suspicious processes or network connections
- File integrity monitoring — Watching for unauthorized file changes
- Container runtime security — Blocking malicious container behavior
- Network microsegmentation — Enforcing workload-level network policies
The pragmatic approach: start agentless for posture management (80% of value), add targeted agents only where runtime protection is specifically required.
How Kloudle Helps
Kloudle is fully agentless — connect your cloud accounts with read-only credentials and get results from 1,890 security checks in minutes, not weeks. No agents to deploy, no performance overhead, no maintenance burden. Works across AWS, GCP, Azure, DigitalOcean, and Kubernetes. With sovereign deployment, even the scanning infrastructure runs on your systems — agentless to your workloads, sovereign to your data.
Related Terms
- What is CSPM? — The primary use case for agentless scanning
- What is Cloud Misconfiguration? — What agentless scanning detects
- What is Sovereign CSPM? — Agentless scanning on your infrastructure