Glossary

EASM (External Attack Surface Management)

Q: What does EASM stand for?

EASM stands for External Attack Surface Management. It refers to the continuous process of discovering, monitoring, and managing all internet-facing assets an organisation exposes to the public internet — including subdomains, cloud services, open ports, and APIs.

Q: Is EASM the same as attack surface management (ASM)?

EASM is a subset of attack surface management (ASM). ASM covers both internal and external attack surfaces. EASM focuses specifically on the external attack surface — the portion visible from the public internet, without requiring internal network access or credentials.

Q: Which companies need EASM?

Any organisation with internet-facing infrastructure benefits from EASM — particularly startups and SMBs that accumulate external exposure rapidly without dedicated security teams. EASM is also required evidence for ISO 27001, SOC 2, PCI DSS, and GDPR audits that mandate documented external vulnerability management.

Discovering and monitoring everything an attacker can see from the public internet

Quick Answer: EASM stands for External Attack Surface Management — the continuous process of discovering all internet-facing assets associated with an organisation and monitoring them for vulnerabilities. Unlike a traditional vulnerability scanner, EASM starts with discovery: finding assets your team does not know about before scanning them.

What does EASM cover?

Asset discovery — finding all internet-facing assets (subdomains, APIs, cloud storage, exposed services) using DNS enumeration, certificate transparency logs, and passive intelligence sources
Continuous monitoring — rescanning discovered assets on a regular cadence so new vulnerabilities are detected as infrastructure changes
Vulnerability detection — identifying security issues across the external attack surface: open ports, misconfigured TLS, exposed credentials, subdomain takeovers, web application vulnerabilities
Risk prioritisation — ranking findings by exploitability and business impact so teams know what to fix first

Is EASM the same as attack surface management (ASM)?

EASM is a subset of ASM. Attack surface management covers both internal and external exposure. EASM covers only the external attack surface — everything reachable from the public internet without VPN or internal credentials. If a scanner needs network access or an agent inside your infrastructure, it is not EASM.

Which companies need EASM?

Any company with internet-facing infrastructure needs EASM — particularly startups and SMBs that accumulate subdomains, cloud assets, and third-party integrations faster than they can track them. EASM is also a documented requirement under ISO 27001, SOC 2, PCI DSS, and GDPR: all require ongoing external vulnerability management, not just a one-off penetration test.

For a full explanation of how EASM works, why startups need it, and how it compares to internal scanning, read: What Is External Attack Surface Management?

What are common questions about EASM?

What does EASM stand for?

EASM stands for External Attack Surface Management — the continuous process of discovering and monitoring all internet-facing assets associated with an organisation.

Is EASM the same as attack surface management (ASM)?

EASM is the external-only subset of ASM. ASM covers internal and external attack surfaces; EASM covers only what is visible from the public internet.

Which companies need EASM?

Any company with internet-facing infrastructure benefits from EASM. It is especially valuable for startups and SMBs without dedicated security teams, and for companies building compliance evidence for ISO 27001, SOC 2, PCI DSS, or GDPR.

What related terms should you read next?

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