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FIELD GUIDE / ASM

Attack surface management starts with knowing what is exposed.

Attack surface management is the ongoing practice of finding digital assets, understanding how they are exposed and helping owners decide what requires attention.

What makes up an external attack surface?

It includes internet-facing domains, subdomains, applications, cloud resources, IP addresses, certificates and reachable services. The inventory can change whenever a team launches a product, moves infrastructure or retires a system.

Why do unmanaged assets matter?

An asset that has no clear owner may miss routine configuration review, software maintenance or access control decisions. The first useful step is to verify ownership and purpose, then assess the actual exposure.

How does discovery work?

Start with assets the organization knows and authorizes. Review related DNS, certificate and service observations, then verify relationships before adding newly found properties to the assessment scope. Active testing should follow explicit authorization.

How should teams prioritize?

Technical severity is one input. Reachability, business importance, evidence quality and existing controls also matter. Findings need a clear owner and next action.

FREQUENT QUESTIONS

Attack surface management, explained.

Is attack surface management the same as a vulnerability scan?

No. ASM starts with visibility and context around assets and exposure. Vulnerability assessment is a related practice that tests for specific weaknesses within an authorized scope.

Does every exposed service represent a security issue?

No. Many public services are intentional. Review their purpose, access controls and configuration before deciding whether action is required.

How often should an attack surface be reviewed?

Review frequency depends on how often your environment changes and on your risk requirements. An assessment plan should define an appropriate cadence without assuming every change is observed instantly.

THE NEXT STEP

Understand your external exposure.

Talk with us about an authorized assessment and the assets that matter to your organization.

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