Enterprise Network Security: 5 Common Vulnerabilities and How to Fix Them

The Current State of Cybersecurity in Vietnam

According to a 2024 report by VNCERT, the number of cybersecurity incidents targeting Vietnamese businesses increased by 43% compared to 2023. More concerning is that 67% of these incidents stemmed from known vulnerabilities and were entirely preventable.

Vulnerability #1: Weak Passwords and Poor Account Management

This remains the leading cause of security breaches. Common issues include:

• Using device default passwords (admin/admin, admin/1234)
• Shared admin accounts used by multiple people
• Lack of a policy for regular password rotation

Solution: Implement Multi-Factor Authentication (MFA) and a centralized password management system such as Microsoft Entra ID (Azure AD). Require complex passwords of at least 12 characters.

Vulnerability #2: Lack of Network Segmentation

Many SMEs operate all devices on a flat network without segmentation. This means that if a device is compromised, an attacker can move freely throughout the entire system.

Solution:

• Create dedicated VLANs for each department (accounting, operations, IT)
• Isolate IoT devices and IP cameras on a separate VLAN
• Set up a DMZ for public-facing servers

Vulnerability #3: Improperly Configured Firewall

Having a firewall does not guarantee system security. Many businesses install firewalls with default configurations or "allow all outbound" rules—completely disabling protective features.

Solution:

• Apply the least privilege principle: only allow traffic that is truly necessary
• Enable IPS/IDS (Intrusion Prevention/Detection System)
• Audit firewall rules every six months to remove outdated rules

Vulnerability #4: Out-of-Date Software and Firmware

73% of successful attacks exploit vulnerabilities for which patches are already available. However, many businesses delay updates due to concerns about operational disruptions.

Solution:

• Establish a patch management process with a specific schedule
• Test patches in a staging environment before deploying to production
• Prioritize patching vulnerabilities rated Critical (CVSS ≥ 9.0) within 24 hours
• Use tools like Microsoft WSUS or Qualys to automate the process

Vulnerability #5: Lack of Monitoring and Anomaly Detection

Not all attacks are loud. Many APTs (Advanced Persistent Threats) operate silently within corporate networks for months before being detected.

Solution:

• Deploy SIEM (Security Information and Event Management) to aggregate and analyze logs
• Set up alerts for unusual behavior: logins outside of business hours, bulk file access, connections to unknown IP addresses
• Conduct annual penetration testing to proactively identify vulnerabilities

Conclusion

Security is not a static state but an ongoing process. Businesses need to build a security culture from leadership down to employees, while investing in appropriate tools and training.

FATech offers comprehensive Security Assessment services to help businesses identify and address vulnerabilities before they are exploited.