Attack surface reduction, or ASR, is the practice of limiting the number of ways attackers can access, abuse, or move through systems and applications. It matters because the easiest attack to stop is often the one that no longer has a usable path at all.
What is Attack Surface Reduction (ASR)?
ASR includes steps such as disabling unnecessary features, reducing exposed services, tightening application behavior, limiting macro and script abuse, minimizing privileges, and closing weak access paths. The focus is on proactively shrinking attacker opportunity before an incident begins.
What ASR Commonly Includes
Common measures include endpoint hardening, application controls, service reduction, script restrictions, risky feature blocking, and stronger identity and access boundaries.
ASR vs. Detection-Only Security
Detection helps identify attacks in progress. ASR reduces the number of ways attackers can succeed in the first place.
Frequently Asked Questions
Why is ASR important?
Because reducing unnecessary exposure lowers both the likelihood and impact of many common attack paths.
Does ASR only apply to endpoints?
No. The principle applies across identities, applications, cloud systems, web exposure, and operational workflows.
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