EASM is the practice of continuously discovering, assessing, and monitoring every internet-facing asset associated with an organization. For MSPs, it's the foundation of a defensible security program — and increasingly a compliance requirement.
Your external attack surface is everything an attacker can see and interact with from the internet, without any internal access. This includes your web applications, APIs, DNS configuration, email security, TLS certificates, exposed ports, cloud assets, subdomains — and critically, the assets you've forgotten about.
EASM is the continuous process of:
Gartner identifies EASM as one of the fastest-growing security categories. Organizations that implement EASM programs experience roughly 30% fewer successful external attacks than those relying on periodic vulnerability scans alone.
MSPs often ask: "We already run vulnerability scans. How is EASM different?"
The short answer: traditional vulnerability scanning tells you what's wrong with the assets you know about. EASM first finds all your assets — including the ones you don't know about — and then assesses them continuously.
In 2024, 43% of data breaches involved web application attacks. Most of those web applications were known to the organization but their security configuration had drifted — headers removed, TLS downgraded, APIs left open after a dev project. Periodic scanning would have caught this. Continuous EASM catches it within 24 hours.
A comprehensive EASM program covers every layer of an organization's internet-facing presence. Here are the 20+ categories that SBCMSP scans across 673 individual checks:
For Managed Service Providers, EASM delivers value at three levels:
You find the exposed RDP port, the expired TLS certificate, the missing DMARC record — before a breach occurs. This shifts the MSP from reactive ("we're investigating the incident") to proactive ("we fixed this before it became an incident").
Every major compliance framework (SOC 2, PCI DSS, HIPAA, CMMC, CIS Controls) requires documented evidence of external security assessment. EASM provides that evidence automatically — timestamped scan results, finding history, and remediation audit trails ready for auditors.
MSPs that offer EASM as part of their security stack charge 30-50% higher monthly fees than those offering basic monitoring and patching alone. Clients who understand their external attack surface are more likely to invest in deeper security programs — and more likely to stay long-term.
Add a domain, verify ownership with a DNS TXT record, and SBCMSP runs 673 checks automatically. No agents, no configuration, no professional services.
Start Free TrialEvery major compliance framework has explicit requirements that EASM directly addresses:
Control 7 (Continuous Vulnerability Management) requires automated scanning of internet-facing systems. Control 9 (Email and Web Browser Protections) requires specific email security configurations. Control 12 (Network Infrastructure Management) requires external boundary monitoring. EASM addresses all three.
Requirement 6.3.3 requires that all external-facing applications are protected against known vulnerabilities. Requirement 11.3 requires quarterly external vulnerability scans by an ASV (Approved Scanning Vendor). EASM provides continuous coverage between mandatory ASV scans.
164.308(a)(1) requires a risk analysis that includes threats to the confidentiality, integrity, and availability of ePHI. External attack surface assessment is a core component of any defensible HIPAA risk analysis.
CA.2.157 requires development, documentation, and implementation of a system security plan. RA.3.137 requires periodic risk assessments. External attack surface scanning directly satisfies both.
A repeatable EASM program has four components:
Don't rely on clients to tell you what they have. Use certificate transparency logs to discover subdomains. Use RDAP to check domain registration expiry. Use port scanning to identify what's exposed. What clients don't know about, attackers will find.
Point-in-time scans are not EASM — they're a snapshot. Real EASM requires continuous scanning so that configuration drift is detected within 24 hours, not six months later at the next assessment.
Every finding should map to the compliance frameworks relevant to that client. A healthcare client needs HIPAA mapping. A government contractor needs CMMC. A payment processor needs PCI DSS. Pre-mapped findings turn raw scan results into compliance evidence without additional analyst work.
Findings without remediation tracking are just noise. Build a workflow: finding → ticket (PSA) → assignment → fix → verification → evidence capture. The audit trail from detection to resolution is what compliance auditors actually need to see.
SBCMSP automates all four components: daily scanning across 673 checks, compliance mapping to 10 frameworks, PSA ticket creation (HaloPSA, Autotask, Syncro, Atera, NinjaOne), and an evidence vault that captures every scan result with timestamps for auditor review.
External Attack Surface Management is not optional for MSPs serving clients with compliance requirements. It's the technical foundation of a defensible security program — continuous, comprehensive, and audit-ready.
The MSPs winning in the security market are the ones who can show clients exactly what their external attack surface looks like, prove it's being monitored continuously, and demonstrate remediation progress over time. That's what EASM delivers.
673 external checks. 10 compliance frameworks. 5 PSA integrations. White-label client portal. Start your free trial — no credit card required.
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