Common Vulnerabilities in Small Business Networks

After testing hundreds of Texas businesses, these are the vulnerabilities we see most often—and how to fix them.

1. Weak Passwords

This remains the #1 issue we find. Common problems include:

• Default credentials on routers and devices
• Simple passwords like "Company123!"
• Same password used across multiple systems
• No multi-factor authentication (MFA)

Fix: Implement MFA everywhere, use a password manager, enforce strong password policies.

2. Outdated Software and Systems

Unpatched software is an open door for attackers:

• Old Windows servers no longer supported
• Routers with known vulnerabilities
• Unpatched firewalls and security devices
• Legacy applications that can't be updated

Fix: Establish a patch management program. Replace end-of-life systems.

3. Misconfigured Firewalls

Firewalls are supposed to protect you—but misconfigurations can make them useless:

• Rules allowing unnecessary inbound traffic
• Open ports that shouldn't be exposed
• Default configurations never changed
• No outbound filtering

Fix: Audit firewall rules quarterly. Follow the principle of least privilege.

4. Phishing Susceptibility

Your employees are often your weakest link:

• No security awareness training
• No phishing simulations to test readiness
• Employees clicking malicious links
• Willingness to share credentials

Fix: Implement regular security training and phishing simulations.

5. Unsecured Remote Access

Remote work created new attack vectors:

• Old VPN solutions with vulnerabilities
• No MFA on remote access
• Remote Desktop Protocol (RDP) exposed to internet
• Personal devices accessing company data

Fix: Use modern VPN with MFA, disable RDP exposure, implement remote work policies.

6. Weak Wireless Security

Wireless networks can be an easy entry point:

• WEP or WPA2 (not WPA3)
• Default wireless passwords
• Guest networks not properly segmented
• No wireless intrusion detection

Fix: Upgrade to WPA3, use strong unique passwords, segment guest networks.