Know Your Attack Surface

Every internet-facing asset your organization operates — every web application, API endpoint, cloud instance, email server, and IoT device — is a potential entry point for attackers. Your attack surface is the sum total of these exposure points, and managing it is the foundation of modern enterprise cybersecurity.

Attack Surface Manager provides the knowledge and strategies to discover, inventory, and reduce your digital footprint before adversaries exploit it.

What Is an Attack Surface

An organization's attack surface includes every pathway that an unauthorized user could potentially use to enter or extract data from a system:

• External attack surface — Public-facing websites, APIs, DNS records, SSL certificates, cloud storage buckets, and exposed services
• Internal attack surface — Employee endpoints, network segments, Active Directory configurations, and internal applications
• Human attack surface — Phishing susceptibility, credential hygiene, social engineering vectors, and insider threat potential
• Third-party attack surface — Vendor integrations, supply chain software, and SaaS platforms with access to your data

Common Attack Surface Risks

Shadow IT

Departments spinning up cloud services, SaaS tools, and development environments without security team visibility. Shadow IT accounts for an estimated 30 to 40 percent of enterprise IT spending and creates unmonitored exposure.

Forgotten Assets

Legacy servers, abandoned subdomains, test environments left running, and deprecated API endpoints that remain accessible long after their purpose has ended.

Misconfigured Cloud Resources

Publicly accessible S3 buckets, overly permissive IAM roles, unencrypted databases, and default credentials on cloud-hosted services.

Certificate and DNS Drift

Expired SSL certificates, dangling DNS records pointing to decommissioned infrastructure, and subdomain takeover vulnerabilities.

Attack Surface Management Tools

Modern ASM platforms continuously discover and monitor your external-facing assets:

• Censys — Internet-wide scanning and asset discovery with certificate transparency monitoring
• Shodan — Search engine for internet-connected devices, useful for identifying exposed services
• Microsoft Defender EASM — Enterprise attack surface mapping integrated with the Microsoft security ecosystem
• CrowdStrike Falcon Surface — Real-time external asset discovery and risk scoring
• Mandiant Advantage ASM — Threat-intelligence-enriched attack surface monitoring

Best Practices

• Maintain a living asset inventory — Automate discovery and reconcile against your CMDB regularly
• Reduce what you expose — If a service does not need to be public, take it off the internet
• Monitor continuously — Point-in-time assessments miss the assets that appear between scans
• Integrate with vulnerability management — Correlate ASM findings with CVE data to prioritize remediation
• Include third parties — Your vendors' security posture is part of your attack surface

Why Attack Surface Management Matters Now

• Cloud adoption has expanded the perimeter — The traditional network boundary no longer exists
• Attackers automate reconnaissance — Automated scanning finds your exposures faster than manual inventory can track them
• Regulatory pressure is increasing — Frameworks like NIST CSF, SOC 2, and DORA require demonstrable asset management
• Breach costs are rising — The average cost of a data breach now exceeds $4 million globally

You cannot protect what you cannot see. Start by mapping your attack surface.