The short answer
- Yes, every business needs a real firewall, not just the router your internet provider supplied. The Canadian Centre for Cyber Security’s baseline controls call for a dedicated firewall between the company network and the internet, plus the built-in firewall switched on on every computer.
- It blocks the constant automated scanning that hits every network, keeps weak devices such as cameras away from your files, and gives remote staff a safe way in.
- An unmaintained firewall is a liability. Firewalls are now one of the most common ways attackers get in, usually through missing updates or weak VPN passwords.
- A small office firewall costs roughly $1,100 to $2,500 in the first year, a fraction of a typical breach.
A firewall is the checkpoint between your office network and the internet. It looks at every connection trying to come in or go out, and it blocks anything that does not match your rules. Without one, every computer, printer and camera in your office is much easier to reach from outside. If you already know you need one and want setup details, our guide to firewall types and configuration covers that. This article explains why, in plain language, using the latest Canadian and global data.
The numbers at a glance
| What the data shows | Source |
|---|---|
| 16% of Canadian businesses were affected by a cyber incident in 2025, unchanged from 2023. The rate was 15% for small businesses and 25% for large ones. | Statistics Canada, 2026 |
| Canadian businesses spent about $1.2 billion recovering from cyber incidents in 2023, double the 2021 amount. | Statistics Canada |
| The average data breach in Canada costs CA$7.11 million, the highest IBM has recorded. Breaches took 205 days on average to find and contain. | IBM, 2026 |
| The average organization faced 1,968 cyberattacks a week in 2025, up 70% since 2023. | Check Point, 2026 |
| Ransomware was part of 48% of breaches. About 96% of ransomware victims of known size were small or mid-sized organizations. | Verizon DBIR, 2026 |
| The median small business cyber insurance claim was about US$38,000. In the worst cases, losses passed 7% of yearly revenue. | Verizon, 2026 |
What a firewall does for a business
Think of a firewall as the front desk of your building. Expected visitors get waved through. Anyone who just shows up gets turned away. Staff can head out to approved places, but not anywhere they like. Inside, it decides which parts of the building can reach each other.
In practice, a business firewall:
- Blocks connections from the internet that nobody inside asked for, such as automated scans and password guessing against your server.
- Controls what leaves the office, so an infected PC or a cheap camera cannot quietly send data wherever it wants.
- Stops staff from reaching websites known to spread malware or run scams.
- Keeps guest Wi-Fi, printers and cameras apart from the computers that hold your files.
- Gives remote staff a secure way in through a VPN.
- Logs what it allowed and blocked, which matters a lot when something goes wrong.
Most offices now use a next-generation firewall. On top of the basic rules, it recognizes applications, checks traffic against known attack patterns and filters websites by category. The router from your internet provider does a little of this, but it is not a business firewall. Our explainer on routers, modems and switches sorts out which box does what.
Seven reasons every business needs a firewall
1. Attackers scan every network, not just big ones
Most attacks are not personal. Automated tools sweep the internet around the clock looking for open doors, and they do not check your company size first. Check Point counted an average of 1,968 attacks per organization per week in 2025, a 70% jump in two years. A firewall turns that background noise away before it reaches your computers.
2. Small businesses are the main ransomware target
Verizon’s 2026 Data Breach Investigations Report found ransomware in 48% of breaches, and about 96% of the victims whose size was known were small or mid-sized organizations (Verizon counts anything under 1,000 employees as small). Attackers go after smaller firms because they usually have fewer defences and nobody watching the network full time.
3. A working firewall often catches attacks early
In its State of Ransomware 2026 report, Sophos asked 2,158 organizations hit by ransomware what their firewall did during the attack. The earlier the firewall noticed, the less likely the victim was to end up with encrypted data.
Share of ransomware victims whose data ended up encrypted, by what their firewall detected. Source: Sophos, State of Ransomware 2026, organizations with 100 to 5,000 staff in 17 countries.
4. A breach costs far more than a firewall
IBM puts the average cost of a breach in Canada at a record CA$7.11 million. Large companies pull that average up, so it helps to look at smaller firms too: Verizon’s analysis of cyber insurance claims put the median small business loss at about US$38,000, and in the worst 2.5% of small business claims the loss was more than 7% of yearly revenue. An entry-level next-generation firewall for a small office costs a small fraction of either figure.
5. It keeps one weak device from exposing everything
Printers, security cameras, smart TVs and desk phones are rarely updated and cannot run antivirus. On a flat network, a hacked camera can reach the same file server your bookkeeper uses. A firewall lets you split the network into zones, as in the diagram above. The Cyber Centre’s baseline controls say never to connect public Wi-Fi to the company network and to wall off point-of-sale systems behind a firewall. Our articles on VLANs and business Wi-Fi security show how this works on the switch and Wi-Fi side.
6. It makes remote work safe
Opening Remote Desktop or file sharing straight to the internet is one of the quickest ways to get breached. A firewall gives remote staff a VPN instead: an encrypted connection they open after signing in with multi-factor authentication. For teams that are rarely in the office, a cloud security service can protect people wherever they work. Our business VPN comparison covers the options.
7. Clients, insurers and privacy law expect it
- Card payments. If you accept credit cards, the PCI DSS security standard opens with a requirement to install and maintain network security controls such as firewalls.
- Privacy law. PIPEDA requires safeguards suited to how sensitive your information is. Breaches that pose a real risk of significant harm must be reported to the Privacy Commissioner, and every breach must be recorded and the record kept for two years. Bill C-36, tabled in June 2026, would replace PIPEDA’s privacy rules with a new law, but it has not passed yet.
- Insurance. Insurers ask about MFA, backups and network protection before they quote or renew.
- Clients. Larger customers often send a security questionnaire before they sign with a supplier. A properly managed firewall is usually near the top.
What a firewall will not do
A firewall is one layer, not a full security plan. Sophos found that half of the ransomware attacks in its 2026 survey started with a malicious email or phishing message. A firewall cannot stop someone typing their password into a fake sign-in page, and it does not protect a laptop on hotel Wi-Fi unless that traffic comes back through the office or a cloud security service. It works best alongside:
- MFA on email, the VPN and every admin account
- Endpoint protection on every computer
- Email filtering and short, regular phishing training
- Backups kept where ransomware cannot reach them
Our guide to cybersecurity essentials for GTA businesses puts all of these in order.
An unmaintained firewall can become the way in
Firewalls are now a favourite target
In the Sophos study, firewalls were the entry point in 21% of attacks that began with a software flaw, a stolen password or password guessing, and attackers guessing passwords targeted the firewall 44% of the time. In 2025, flaws in Cisco, WatchGuard and SonicWall firewalls were exploited in the wild, some within days of disclosure. If your firewall is past its end-of-support date, see our firewall replacement guide.
A firewall that was set up once and then forgotten is a risk, not a defence. At a minimum:
- Update the firmware monthly, and within days when the vendor flags a critical issue.
- Keep the admin page off the internet, and give each admin their own login with MFA.
- Require MFA on the VPN and lock accounts after repeated failed sign-ins.
- Renew the security subscription so threat updates keep arriving.
- Review the rules every quarter and delete the ones nobody needs.
- Replace the unit before its end-of-support date, not after.
Step-by-step instructions are in our firewall configuration guide.
How much a business firewall costs
The price depends on your internet speed, how many people use the network and which security features you turn on. As a rough guide, based on published Canadian reseller prices in October 2026:
| Office size | What you need | First year | After that |
|---|---|---|---|
| About 5 to 25 people | Entry-level next-generation firewall with security services | About $1,100 to $2,500 | About $500 to $1,000 a year for security services |
| 25 to 250 people | A larger model sized for faster internet and more VPN users; often a failover pair from about 50 people | Roughly double for a failover pair | Security services for each unit |
| Any size | Professional setup, monthly updates and rule reviews | A few hours of setup | Often included in managed IT plans |
Even at the top of the small-office range, the first year costs a fraction of the US$38,000 median small business claim. Free open-source firewalls such as pfSense and OPNsense are another option if you have the skills to run them. Our open-source firewall guide covers the trade-offs.
Get a firewall check for your GTA office
If you are not sure whether your office has a real firewall, when it was last updated or who can sign in to it, a review is the place to start. Our network and firewall team checks firmware, admin access, rules, VPN settings and logging for offices in Toronto, Mississauga, Vaughan, Oakville and across the GTA. We work with Fortinet FortiGate, Cisco Meraki and Ubiquiti UniFi, and we can supply new hardware through our Fortinet reseller service. If you would rather have updates and rule reviews handled every month, that is part of our managed IT services. Call 647-812-3775 or send us a message.