6 Signs Your Wi-Fi Network Has Been Hacked

If your internet has been inexplicably slow, your router settings have changed, or you’re seeing devices you don’t recognize on your network — your Wi-Fi may be compromised. A hacked network isn’t just an inconvenience. It’s an open door to your personal data, financial accounts, and every device in your home or office.

Here are six warning signs to watch for and what to do about each one.

1. Persistent, Unexplained Slowdowns

A single slow evening could be your ISP. But consistent, unexplained lag across all devices often means someone else is consuming your bandwidth:

• Cryptocurrency mining
• Launching botnet attacks against other targets
• Sending high-volume spam campaigns
• Exfiltrating data from your connected devices

If a speed test shows significantly lower throughput than your plan provides — and rebooting the router doesn’t fix it — investigate further.

2. Unknown Devices on Your Network

Every connected device has a unique MAC address. Log into your router’s admin panel (usually at 192.168.1.1 or 192.168.0.1) and check the list of connected devices.

Count your devices first. Between phones, tablets, laptops, smart TVs, thermostats, and speakers, most households have 10-20 connected devices. If your router shows 25, someone else is on your network.

3. You’re Locked Out of Your Router

If your usual admin credentials no longer work, an attacker may have changed them. This is one of the clearest signs of compromise because legitimate router software doesn’t reset its own password.

You’ll need to perform a physical factory reset using the small pinhole button on the back of the router. After resetting, change the admin password immediately — don’t leave it on the manufacturer default.

4. Browser Redirects to Suspicious Sites

Typing “google.com” but landing on a page asking you to “update Flash Player”? This is DNS hijacking. A compromised router redirects your traffic to fake versions of legitimate websites — including convincing replicas of your bank’s login page.

DNS hijacking affects every device on the network. According to CISA’s cybersecurity advisories, DNS manipulation remains one of the most effective attack techniques.

5. Software You Didn’t Install

Remote access tools like TeamViewer or AnyDesk appearing without your knowledge is a serious red flag. Other suspicious signs:

• New browser toolbars or extensions you didn’t add
• Your default search engine or homepage has changed
• Programs launching at startup that you don’t recognize

If you’re seeing these symptoms, your network compromise has likely progressed to individual device infections. Our virus removal service can clean affected machines. Also check our guide on five red flags your computer is compromised.

6. Constant Antivirus Alerts About Inbound Connections

If your antivirus is repeatedly blocking inbound connection attempts, threats are getting past the router — meaning the network perimeter has been breached.

Don’t just dismiss these alerts. Each blocked connection represents an active probe testing for weaknesses in your device-level defenses.

What to Do If You’ve Been Compromised

1. Disconnect the router — unplug it to immediately cut off the attacker’s access
2. Factory reset the router — wipe all modified settings
3. Update the firmware — check the manufacturer’s website for the latest version
4. Change every password — router admin, Wi-Fi password, and any accounts accessed while compromised
5. Use WPA3 encryption — if supported. WPA2-AES is the minimum. Never use WEP.
6. Scan every device — run full malware scans on all computers, tablets, and phones

Preventing Future Breaches

• Disable WPS — Wi-Fi Protected Setup has known vulnerabilities
• Use a strong, unique Wi-Fi password — at least 16 characters
• Enable automatic firmware updates — or check quarterly
• Create a guest network — isolate visitors and IoT devices from your primary network (our post on business network mistakes explains how VLANs make this work)
• Disable remote management — unless specifically needed

Our business essentials guide covers the baseline security every home office and small business should have. Also review the 7 security mistakes that invite malware to close common gaps.

Get Your Network Secured

A compromised network puts every connected device — and every piece of data on them — at risk. From security audits to full network rebuilds, our services are designed to keep Solano County residents and businesses protected.

Reach out to us to schedule a network assessment.