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[Home](/)[Glossary](/glossary)Attack Surface[Back to Glossary](/glossary)Attack Surface
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The sum of all points in a system where an attacker can attempt to enter or extract data, including APIs, UI components, and network services.

security conceptrisk managementarchitecture

An attack surface is the total number of points where an unauthorized user can try to enter data into or extract data from a system. It encompasses all the ways an attacker can interact with your application, including web endpoints, APIs, authentication mechanisms, file upload features, third-party integrations, and network services.

Reducing the attack surface is a fundamental security principle. Every exposed endpoint, open port, or enabled feature is a potential entry point for attackers. Organizations should regularly audit their attack surface by mapping all publicly accessible services, removing unnecessary endpoints, and minimizing the permissions and functionality exposed to untrusted users.

Modern applications often have larger attack surfaces than expected due to microservices architectures, third-party APIs, forgotten staging environments, and cloud services with default public access.

How APVISO tests for this: APVISO's recon agent is specifically designed for comprehensive attack surface mapping. It discovers subdomains, open ports, API endpoints, technology fingerprints, and exposed services to build a complete picture of your application's attack surface before targeted testing begins.

Related Terms
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[Reconnaissance](/glossary/reconnaissance)[Subdomain Takeover](/glossary/subdomain-takeover)[Security Misconfiguration](/glossary/security-misconfiguration)

Test your applications for attack surface vulnerabilities
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