Your office router could be silently hijacked today – and you wouldn’t even know it

Why a router hijack matters to your business

Imagine you run a bakery, a dental clinic, or a small logistics firm. Your point‑of‑sale system, online booking calendar, and even the security cameras all talk to each other through the same network. If someone gains control of the router that connects all those devices, they can see, change, or block the data flowing through your business – often without you ever noticing.

A recent warning from CERT Polska showed that MikroTik routers with an internet‑exposed SSH (Secure Shell) service can be taken over without any password. In plain language: an attacker can log into the router from anywhere in the world, change its settings, and redirect traffic to malicious sites or shut down your network entirely. For a small business, that can mean lost sales, damaged reputation, and costly recovery work.

What the vulnerability actually is

• SSH exposure – SSH is a tool that lets administrators manage a router remotely, like a secure remote desktop. When the SSH port (usually 22) is reachable from the internet, anyone can try to connect.
• No authentication – In the affected MikroTik versions, a bug allowed a connection without needing a username or password. Think of it as leaving the front door unlocked and the alarm disabled.
• Full control – Once inside, the attacker can change firewall rules, create new admin accounts, or install malicious scripts that persist even after a reboot.

Updating to the latest RouterOS version closes the door.

Simple router security checklist you can do today

1. Check whether your router’s management ports are exposed

   • Open a web browser on a computer outside your office network (for example, using your mobile data).
   • Type your public IP address followed by :22 (e.g., 123.45.67.89:22).
   • If you see a login prompt or any response, the SSH port is reachable from the internet. If the connection times out, it is likely blocked.

2. Update the router firmware

   • Log in to the router’s web interface from inside your office network.
   • Look for a “Firmware” or “RouterOS” section.
   • Download the latest version directly from the MikroTik website (versions 6.49.21, 7.23.5, 7.24.2 or newer).
   • Follow the on‑screen instructions to install the update. The process usually takes a few minutes and the router will reboot.

3. Disable unused services

   • In the router’s settings, locate the list of services (SSH, HTTP, HTTPS, bandwidth‑test, etc.).
   • Turn off any service you do not actively use, especially SSH, unless you need remote administration.

4. Lock management ports to the local LAN

   • Create a simple firewall rule that allows traffic to the router’s management ports only from IP addresses inside your office network (e.g., 192.168.0.0/24).
   • Deny all other incoming connections to those ports. Most routers have a “WAN (the internet‑facing side of your network) → Router” rule you can edit or add.

5. Verify the router hasn’t already been compromised

   • Open the router’s log view and look for entries that you do not recognize, such as unknown user accounts or scripts that were added recently.
   • Run the command /system/device-mode/print (or the equivalent in the web UI) to see if the device is flagged as “suspicious”.
   • If you spot anything unusual, isolate the router (disconnect it from the network), back up the current configuration, and consider a factory reset followed by a clean rebuild.

Long‑term protection: why regular maintenance matters

Even a perfectly patched router can become vulnerable again if it is left unattended. Here’s how a proactive approach helps:

• Patch management – New security updates are released regularly. A scheduled check (monthly or quarterly) ensures you never miss a critical fix.
• Firewall hardening – A well‑configured firewall blocks unnecessary inbound traffic, reducing the attack surface to the absolute minimum.
• Remote monitoring – Continuous health checks alert you the moment a port becomes exposed or a configuration change is made without your approval.
• Backup and recovery – Regular, verified backups let you restore a known‑good configuration quickly if something does go wrong.

At IT Move NL we combine Security & Protection (firewall hardening, intrusion monitoring, and patch management) with Maintenance & Support for routers and other network devices. Our team handles the technical details so you can focus on running your business, confident that the network backbone stays safe and reliable.

Learn more about our Security & Protection service

Frequently asked questions

Q: How can I tell if my router has been hijacked?
A: Look for unexpected changes in the router’s admin accounts, unknown firewall rules, or traffic redirection in the logs. Unusual spikes in bandwidth or devices that suddenly lose connectivity can also be signs.

Q: My router is not a MikroTik – does this advice still apply?
A: Absolutely. The principle is the same for any router: keep management interfaces off the public internet, apply firmware updates promptly, and lock down unused services.

Q: I’m not comfortable updating the router myself. What should I do?
A: Contact a trusted IT partner (like IT Move NL). We can perform the update remotely, verify the configuration, and set up ongoing monitoring for you.

Q: How often should I check the router’s logs?
A: A quick glance once a month is enough for most small businesses. If you have a monitoring service in place, you’ll receive alerts automatically when something unusual is detected.

Keep your network safe without the headache

A router is the gatekeeper of your entire digital operation. One open door can let attackers walk straight into your point‑of‑sale system, patient records, or inventory database. By updating firmware, disabling unnecessary services, and restricting access to trusted devices, you close that door today.

If you prefer a partner to take care of router hardening, ongoing monitoring and patch management, let us at IT Move NL run a quick security check for you.

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Sources:

• Attackers Hijack MikroTik Routers Through Internet-Exposed SSH Without Authentication