How Exposed Is Your Network? Get a NetTech Network Vulnerability Scan

A network vulnerability scan tells you exactly where attackers could get in before they actually try. If you’ve never run one, or it’s been over a year, there’s a good chance your firewall, switches, and wireless network have vulnerabilities nobody has checked lately. This piece answers the real questions business owners ask before booking a network security assessment with NetTech.

What a Network Vulnerability Scan Actually Checks

A network vulnerability scan is an automated review of your systems that looks for network vulnerabilities before someone else finds them first. It differs from a full penetration test, which actively tries to exploit what it finds. A scan identifies that the door is unlocked, it does not walk through it.

Most businesses scan networks for vulnerabilities at least once a year, though for many that is not nearly often enough given how fast new devices and software get added.

Network vulnerability scanning tools check for outdated software, missing patches, and weak configurations across every device connected to your network, not just the obvious ones like servers. Not all network vulnerability scanner tools catch the same issues, which is why pairing automated scans with expert review matters.

What is network vulnerability scanning, in plain terms? It’s an automated health check of your network’s security, similar to a home inspection, that flags problems before they turn into a break-in.

Common Types of Network Security Scanning

1. External Vulnerability Scanning

   External vulnerability scanning looks at your network from the outside, the same view an attacker on the internet would have, running an external attack surface assessment of anything publicly exposed.

2. Internal Vulnerability Scanning

   Internal vulnerability scanning checks what happens if someone already has a foothold inside, like an infected laptop or a compromised guest account.

3. External Network Vulnerability Scan

   An external network vulnerability scan specifically targets internet-facing systems: your website, email servers, and remote access tools.

4. Internal Network Vulnerability Scan

   An internal network vulnerability scan targets internal servers, workstations, and shared drives reachable only from inside your building or VPN.

5. Wireless Network Vulnerabilities

   Wireless network vulnerabilities often get missed entirely. An old guest Wi-Fi password shared unchanged for two years is a common finding on a first scan.

Network Vulnerabilities We Find Most Often

1. Firewall Vulnerabilities

   Firewall vulnerabilities usually come from outdated firmware or rules that were never cleaned up after an old vendor relationship ended.

2. Switch Vulnerabilities

   Switch vulnerabilities often involve default admin passwords that were never changed after installation, sometimes years earlier.

3. Open Ports Vulnerability

   An open ports vulnerability means a service is listening for connections it does not need to accept from outside, like an old FTP server nobody remembers turning on.

4. Network Device Vulnerabilities

   Network device vulnerabilities extend beyond firewalls and switches to printers, cameras, and other connected hardware running outdated firmware.

5. Network Misconfigurations

   Network misconfigurations, like an overly permissive firewall rule left from a temporary project, are one of the most common network security gaps we find. They are usually free to fix once identified, which makes them some of the best return-on-effort findings in any scan.

How to Identify Network Vulnerabilities Before They’re Exploited

To identify network vulnerabilities, you need both an automated network vulnerability scanner and someone who reviews the results, since not every flagged item is equally urgent. A vulnerability scan report can list hundreds of findings, and prioritizing the five that actually matter takes real expertise, not just running a tool. As we covered in why attacks go unnoticed for weeks, the gap between finding a weakness and actually fixing it is exactly where dwell time starts.

A network risk assessment doesn’t need to be complicated to be useful. Better network security visibility starts with simply knowing what’s running on every open port on your network.

Steps our team follows for a network security risk assessment:

1. Map your full network attack surface, including forgotten or unmanaged devices.
2. Run external and internal scans separately for complete coverage.
3. Identify open ports and cross-reference them against what should actually be running.
4. Rank findings by real-world risk, not just a generic severity score.
5. Deliver a plain-language vulnerability scan report with clear fix priorities.

How often should a business run a network security scan? Quarterly is a reasonable minimum for most small and mid-sized businesses, with an extra scan after any major network change.

Network Vulnerability Assessment vs Ongoing Testing

A one-time network vulnerability assessment gives you a snapshot. Network security testing on a recurring schedule catches new network infrastructure vulnerabilities as they appear, since new devices and software get added constantly. Think of a network security vulnerability scan as routine maintenance, not a one-time fire drill.

Businesses that have already reviewed SOC operating models often pair ongoing scanning with their monitoring choice, since a scan finds the open door and a SOC watches for anyone walking through it.

What a Real Scan Report Looks Like

A useful vulnerability scan report does not just list every flaw it finds. It groups findings by how easily an attacker could actually use them, starting with anything exposed to the open internet before moving to internal issues that need someone already inside your network.

On a typical first scan for a business that has never run one, we commonly find at least a handful of open ports that should have been closed years ago, plus one or two outdated firewall rules still active from a project that ended long ago.

Turning Scan Results Into Action

A network vulnerability scan is one of the fastest ways to see where your business is actually exposed right now, not where you assume the risk is. NetTech runs both external and internal scans as part of our broader cybersecurity work, and we walk clients through the findings in plain language, not just a scary looking PDF.

If you want the fuller picture first, our guide on real-time threat detection and response shows what happens once a threat gets past a door your scan flagged as weak.

Contact NetTech to schedule your network vulnerability scan today.

Frequently Asked Questions