What your company exposes to the internet (and why it matters)

What the external attack surface is

It's everything your company leaves visible from the internet: what anyone —including an attacker— can see without being inside your network. It's your public face, and also your most vulnerable perimeter.

What it's made of

More than most people imagine. Some examples:

• Your main domain and all its subdomains (store, blog, mail, panels).
• IP addresses and public servers.
• Exposed services: databases, admin panels, APIs.
• The mail server and its configuration.
• TLS/SSL certificates and their validity.
• The technologies you use and their versions (which reveal known vulnerabilities).

Why it grows on its own

The surface isn't static: it expands with everything new you publish. A campaign subdomain, a test service left running, a panel someone opened “just for a bit”.

That's why most companies can't answer a basic question: how many hosts do I have exposed right now?

How attackers discover it

With OSINT (open-source intelligence): DNS records, public certificates, search engines, scan databases. And with automated tools that sweep the entire internet for any exposed or misconfigured system.

They don't need to know you: they find you because you're visible.

The life cycle of an exposed asset

A service gets published, used, and often forgotten. Over time it stops being updated, accumulates vulnerabilities and becomes the easiest door. “Forgotten” assets cause the most incidents.

Common mistakes that leave doors open

• Subdomains pointing to services that no longer exist.
• Admin panels reachable from the internet.
• Expired or misconfigured certificates.
• Outdated software with known flaws.
• Access that stayed active after someone left.

A pentest isn't enough

A pentest is a snapshot of one moment. Your surface changes all the time, so between pentests you're blind. What's needed is continuous monitoring.

How to discover and control your surface

You don't need to know how many servers you have. Enter your domain and NEO discovers your public surface, counts the exposed hosts and tells you what to look at first.

It's free, it doesn't touch your systems, and the report lands in your inbox, usually in under an hour.