# EASM vs CSPM

> Compare external attack surface management with cloud security posture management.

Canonical: https://sentryxmonitor.com/learn/external-attack-surface-management/easm-vs-cspm/
Last updated: 2026-08-08

External attack surface management

EASM observes assets from the public internet, while Cloud Security Posture Management evaluates cloud-account configuration using provider context and authenticated access.

Reviewed 2026-08-08 Read-only educational guidance

## Key points

- EASM sees the outside view.

- CSPM sees cloud configuration context.

- Together they connect public exposure to cloud ownership.

## What is easm vs cspm?

EASM observes assets from the public internet, while Cloud Security Posture Management evaluates cloud-account configuration using provider context and authenticated access.

## How does it work?

EASM finds public names, addresses, certificates, and services across providers. CSPM reads cloud inventory and configuration to identify issues such as public storage, permissive networking, weak identity settings, or missing encryption controls.

## What can go wrong?

EASM may see an endpoint without knowing its cloud owner, while CSPM may miss external assets outside connected accounts. Multi-cloud, SaaS, and acquisitions make both views necessary.

## How can teams detect the problem?

Map public endpoints to cloud accounts and compare EASM candidates with CSPM inventory. Investigate unmatched assets in both directions.

## How can teams improve the situation?

Standardize cloud tagging, connect registrar and cloud ownership, and route exposure findings to the account owner with configuration context.

## What does a technical example look like?

```
Public hostname -> cloud load balancer -> cloud account and owner -> security-group review -> monitored endpoint
```

The example uses reserved documentation domains and addresses. Apply the same reasoning to systems you own or are authorized to assess.

## Authoritative technical references

- [RFC 9162: Certificate Transparency Version 2.0](https://www.rfc-editor.org/rfc/rfc9162.html)

## How does continuous monitoring help?

A point-in-time check explains the observed state now. [Continuous monitoring](https://sentryxmonitor.com/services/uptime-monitoring/) establishes an expected baseline, repeats the relevant check, and records meaningful state changes so an owner can investigate before a small configuration drift becomes a prolonged security or availability problem. See [External Attack Surface Management](https://sentryxmonitor.com/learn/external-attack-surface-management/) for the surrounding technical context.

## Where does Sentryx Monitor fit?

Sentryx Monitor provides [read-only outside-in discovery](https://sentryxmonitor.com/services/external-attack-surface-monitoring/) and monitoring for public hosts, DNS, HTTPS, TLS certificates, baseline security headers, email-security records, and selected network services. It supports evidence and operational follow-up, but it does not replace authorized penetration testing, authenticated vulnerability assessment, or owner validation.

## Continue learning

- [External Attack Surface Management: A Practical Guide](https://sentryxmonitor.com/learn/external-attack-surface-management/) - Learn what EASM is, how external assets are discovered, how exposure changes, and how continuous monitoring supports an accurate internet-facing inventory.

- [What Is External Attack Surface Management?](https://sentryxmonitor.com/learn/external-attack-surface-management/what-is-easm/) - A clear explanation of EASM, its workflow, scope, and relationship to continuous security monitoring.

- [What Is an External Attack Surface?](https://sentryxmonitor.com/learn/external-attack-surface-management/what-is-an-external-attack-surface/) - Understand which public assets make up an external attack surface and why the inventory changes over time.

- [How Attackers Discover Internet-Facing Assets](https://sentryxmonitor.com/learn/external-attack-surface-management/how-attackers-discover-internet-facing-assets/) - Learn the public signals attackers use to find domains, subdomains, IP addresses, certificates, and exposed services.

## Related
- [Home](https://sentryxmonitor.com/)