5 Common Network Security Flaws Most SMEs Face Today

Network security is often seen as something only large enterprises need to worry about. In reality, SMEs face many of the same risks, especially when their business depends on internet connectivity, cloud applications, remote access and connected devices. 

The problem is that many network weaknesses are not immediately visible. A firewall may be running, employees may have passwords and the internet may be working normally, while security gaps remain underneath. Identifying these weaknesses early helps SMEs reduce their exposure to cyber threats and avoid costly disruption. 

The 5 Most Common Network Security Flaws

1. Weak Access Controls

One of the most common network security flaws is poor control over who can access business systems. Employees, administrators, contractors and third-party users all have different access requirements. Problems arise when users are given more access than they need, or when old accounts stay active after an employee leaves. 

SMEs should regularly review: 

• User accounts and administrator privileges 

• Remote access permissions 

• Network access controls 

• Former employee and third-party accounts 

The principle is simple: users should only have access to the systems required for their work.

2. Outdated Network Devices and Software

Firewalls, routers, switches, access points and servers all require regular updates. When firmware or software is outdated, known vulnerabilities remain open, and attackers can exploit them to gain access or disrupt operations. 

SMEs should keep an inventory of their network equipment, check regularly for security updates and replace devices that are no longer supported by their manufacturers. Consistent patching and lifecycle management reduce unnecessary exposure. Setting a simple quarterly reminder to check vendor advisories is an easy habit that many small teams overlook.

3. Poor Network Segmentation

Not every device or employee needs access to every part of a business network. When a network is poorly segmented, an attacker who compromises one device may have an easy path to other systems. 

Segmentation separates parts of the environment based on their purpose. For example, a business may separate: 

• Employee devices 

• Guest Wi-Fi 

• Servers and business-critical applications 

• Security systems 

• IoT devices 

Proper segmentation limits unnecessary communication between systems and helps contain the impact of a compromised device. It becomes increasingly important as SMEs add more users, branches and cloud services.

4. Misconfigured Firewalls and Network Devices

Having a firewall does not automatically mean a network is secure. Incorrect firewall rules, unnecessary open ports, weak configurations and outdated policies can all create vulnerabilities. A rule created temporarily for a project, for example, may remain active long after it is needed, quietly leaving a door open that nobody remembers creating. 

Regular configuration reviews help businesses remove unnecessary access and ensure security controls still match business requirements. ACEiT provides network security solutions including next-generation firewall capabilities and network security management.

5. Limited Network Monitoring

Another common weakness is poor visibility into what is happening across the network. If a business only discovers a problem after an employee reports something unusual, an attacker may already have had time to operate inside the environment. 

This risk is real for Malaysian organisations. MyCERT’s Q3 2025 incident report found that intrusion accounted for 9 percent of all reported incidents, second only to fraud. 

Network monitoring helps identify unusual traffic, suspicious connections and performance problems that need investigation. For round-the-clock coverage, ACEiT’s Security Operation Centre provides 24/7 monitoring and response beyond normal office hours. 

Why These Network Security Flaws Matter 

A single flaw may seem minor on its own, but several weaknesses can combine into a much larger risk. An outdated device combined with weak access controls and limited monitoring, for instance, makes it far harder for a business to detect or respond to an attack. 

SMEs should therefore treat network security as a complete environment rather than relying on one security product. A stronger approach combines access controls, secure configurations, segmentation, patch management, monitoring, endpoint protection and regular assessments. 

How SMEs Can Strengthen Network Security 

SMEs do not need a complicated network to improve their security. Start by understanding the current environment, then work through these steps: 

1. Identify all network devices and connected systems. 

2. Review who has access to each system. 

3. Remove unnecessary accounts and permissions. 

4. Check that network devices are updated and supported. 

5. Review firewall and security configurations. 

6. Separate networks where appropriate. 

7. Monitor important network activity. 

8. Conduct regular vulnerability and security assessments. 

9. Prepare a response process for suspected incidents. 

10. Review network security as the business grows. 

The right approach depends on the size, industry, infrastructure and risk profile of each business. 

How ACEiT Helps SMEs Improve Network Security 

ACEiT provides network and cybersecurity solutions designed to help businesses build secure, manageable IT environments. Its data networking solutions support network access control, network security management, next-generation firewalls and network monitoring. 

ACEiT also offers cybersecurity services and 24/7 SOC capabilities. For SMEs without a large internal IT or security team, working with an experienced provider gives access to expertise, monitoring and protection that may otherwise be difficult to maintain in-house.