Top 5 Common Network Vulnerabilities and How to Fix Them
In today’s hyper-connected world, businesses rely on their networks more than ever. But with great connectivity comes great risk—cybercriminals are constantly on the lookout for vulnerabilities to exploit. The good news? Most network vulnerabilities are preventable with the right strategies. Let’s break down five of the most common network security risks and how you can fix them.
1. Weak or Default Credentials
The Problem
Many businesses still use weak passwords or default credentials for routers, firewalls, and other network devices. Cybercriminals love this—it’s one of the easiest ways to gain access to a network.
The Fix
- Implement strong password policies requiring at least 12 characters, including uppercase, lowercase, numbers, and special characters.
- Use multi-factor authentication (MFA) wherever possible.
- Change all default credentials on network devices before deploying them.
2. Unpatched Systems and Firmware
The Problem
Outdated software is a hacker’s dream. Unpatched operating systems, firewalls, and network appliances often contain known vulnerabilities that attackers can easily exploit.
The Fix
- Regularly apply patches and firmware updates for all network devices.
- Enable automatic updates where possible to minimise delays.
- Conduct regular vulnerability scans to identify any outdated systems that need attention.
3. Poor Network Segmentation
The Problem
Many SMBs operate on a “flat” network, meaning every device is on the same subnet. If an attacker gains access to one device, they can move laterally across the entire network with little resistance.
The Fix
- Implement network segmentation using VLANs (Virtual Local Area Networks) to limit access between departments and sensitive systems.
- Use firewalls and access control lists (ACLs) to enforce restrictions between segments.
- Adopt a zero-trust approach, ensuring that users and devices only have access to what they absolutely need.
4. Lack of Endpoint Security
The Problem
Endpoints—laptops, smartphones, and IoT devices—are often the weakest link in network security. A compromised endpoint can serve as an entry point for malware, ransomware, or data theft.
The Fix
- Deploy endpoint protection solutions, such as EDR (Endpoint Detection and Response).
- Enforce strict bring-your-own-device (BYOD) policies with mobile device management (MDM) tools.
- Require employees to use VPNs and encrypted connections when accessing company data remotely.
5. Misconfigured Firewalls and Access Controls
The Problem
A firewall is your first line of defense, but if it’s misconfigured, it can leave your network exposed. Common mistakes include overly permissive rules, open ports, and unused services left running.
The Fix
- Regularly audit firewall rules to ensure only necessary traffic is allowed.
- Block unused ports and disable unnecessary services.
- Use intrusion detection and prevention systems (IDS/IPS) to monitor and respond to threats in real time.
Final Thoughts
Network vulnerabilities are inevitable, but they don’t have to be a disaster. By addressing these five common weaknesses, you can significantly reduce your risk and keep your business secure.
Need help securing your network? Our IT network services team specialises in identifying and mitigating vulnerabilities before they become a problem. Get in touch today to schedule a security assessment!