Cybersecurity

5 Common Network Vulnerabilities and How to Fix Them: A Guide for Pakistani Businesses

Discover the most common network security weaknesses exposing Karachi businesses to cyber threats — and the practical steps to fix them.

📅 Jul 10, 2026 ⏱️ 12 min ✍️ Haris Baig (Founder, Arbre IT Support & Solutions)

Many business owners in Karachi believe cyberattacks only happen to large multinationals. In reality, SMEs are prime targets because they often have weak or outdated network security. Here are the five vulnerabilities we encounter most frequently when visiting offices across Karachi.

1. Default Passwords on Routers and IP Cameras

The most common issue we find: routers, switches, and CCTV cameras still running with their factory-default admin credentials (admin/admin or admin/12345). Attackers run automated tools that scan public IPs looking for devices with default credentials.

Fix: Change the admin password on every network device immediately after installation. Use a strong password (12+ characters, mixed case, numbers, symbols). Document it securely.

2. Open RDP Port Exposed to the Internet

Port 3389 (Remote Desktop Protocol) left open directly on a public IP is the number one entry point for ransomware in Pakistan. Attackers run 24/7 automated brute-force attacks against open RDP.

Fix: Never expose RDP to the internet. Require staff to connect via a VPN first, then use RDP over the encrypted VPN tunnel. Or use a port knock or firewall whitelist to only allow RDP from specific IP addresses.

3. Flat Network (No VLAN Segmentation)

Many offices have all devices — staff PCs, CCTV cameras, guest mobile phones, accounting servers — on the same network. If one device is infected, malware can freely move to all others.

Fix: Segment using VLANs:

  • VLAN 10: Staff workstations
  • VLAN 20: Servers and NAS
  • VLAN 30: CCTV cameras (no internet access)
  • VLAN 40: Guest Wi-Fi (completely isolated)

4. No Backups (or Backups on the Same Network)

When ransomware hits, businesses with no backup lose everything. Backups stored on a shared drive connected to the same network are also encrypted by ransomware.

Fix: Follow the 3-2-1 rule: 3 copies of data, on 2 different media, with 1 copy off-site or offline. An external USB hard drive disconnected after backup, plus a cloud backup (OneDrive, Google Drive, or Backblaze) is a practical and affordable solution for most businesses.

5. Unpatched Software and Firmware

Routers and switches with firmware that hasn't been updated in years contain known exploits. Windows machines running without updates are equally vulnerable.

Fix: Schedule a monthly IT review to check for firmware updates on all network devices. Enable Windows Update on all PCs and ensure updates are applied regularly.

If you would like a network security assessment for your Karachi office, contact Arbre IT on +92 313 2689511. We offer practical, affordable network security setups for businesses of all sizes.