Attack Surface Management (ASM) is the practice of discovering, inventorying, and continuously monitoring internet-exposed assets such as domains, IP addresses, cloud services, certificates, web apps, and forgotten systems. The goal is to understand what is visible to outsiders and remove or harden anything that creates unnecessary risk.
ASM matters because attackers often start with the easiest reachable target, not the most valuable one. In real defenses, ASM tools help teams find shadow IT, stale test systems, exposed admin panels, and misconfigured cloud resources before they are abused. They also enrich exposure data with threat intelligence so security teams can prioritize the assets most likely to be scanned, exploited, or chained into an intrusion. Used well, ASM supports faster remediation, better asset hygiene, and stronger external exposure control.