VPN vs Zero-Trust Access

The VPN assumes a perimeter that no longer exists

For decades, remote access meant a VPN: connect to the corporate network, and you are inside the trusted zone. That model made sense when work happened in an office behind a firewall and everything important lived on servers in a back room. It makes far less sense now, when your people work from home, your applications live in the cloud, and a single compromised laptop on the VPN can reach the entire internal network.

Zero-trust access starts from a different assumption: the network is never trusted, identity is, and access is granted per application based on who you are and the state of your device. Understanding the difference helps you decide what your organisation actually needs.

How a VPN really behaves

A VPN authenticates you once, then drops you onto the internal network. From there, you can typically reach anything that network can reach. This is convenient and familiar, but it has real downsides:

• One set of stolen credentials, or one infected device, gains broad lateral access.
• Performance suffers when all traffic is backhauled through a central gateway, especially for cloud apps that then have to route back out again.
• It is coarse. You are either on the network or off it, with little ability to grant narrow, per-app access.

For a small office where everyone is trusted and the apps are few, a VPN can still be perfectly reasonable. The problems grow with scale, with remote work, and with the move to SaaS.

What zero-trust changes

Zero-trust access flips the default. Instead of trusting the network, every request to an application is evaluated on its own. The system asks: is this user who they claim to be, is their device healthy and compliant, and are they authorised for this specific resource right now? Only then is access granted, and only to that resource, not the whole network.

In practice this is built from a few pieces working together: a strong identity provider with multi-factor authentication, device posture checks that confirm a laptop is encrypted and patched, and an access proxy that brokers connections per application. The user often gets a smoother experience, because they reach apps directly rather than tunnelling through a chokepoint.

The honest trade-offs

Zero-trust is not free or instant. It requires you to have your identity house in order first, because the whole model leans on knowing exactly who someone is. It also means inventorying your applications and deciding access policies for each, which is real work. And it introduces dependencies on the access broker and identity provider, so their availability matters.

A VPN, by contrast, is well understood and cheap to stand up. The right answer is rarely a religious commitment to one approach. Many organisations run both during a transition, retiring VPN access app by app as zero-trust coverage grows.

A sensible path forward

If you are considering the shift, start by getting single sign-on and MFA solid across your core applications. Then identify the handful of internal apps that most need protection and put them behind a zero-trust proxy first. Measure the experience, learn, and expand. Trying to replace everything at once is how these projects stall.

Clear up the common misconceptions

A few myths cause organisations to either over-buy or stall. The first is that zero-trust is a single product you purchase. It is not; it is an architecture assembled from identity, device, and access components, several of which you may already own. The second is that it eliminates the need for other controls. It does not. You still need endpoint protection, patching, and backups; zero-trust governs access, it does not replace your wider security programme. The third is that it is only for large enterprises. In reality, cloud-delivered zero-trust services have made the model accessible to small organisations, often more cheaply than maintaining VPN concentrators and the hardware behind them.

Being clear-eyed about what zero-trust is, and is not, keeps the project grounded and prevents it from becoming a vague aspiration that never ships.

Weigh the real costs, not just the licences

When you compare the two, look past the obvious line items. A VPN's costs include the gateway hardware or virtual appliances, the maintenance, and the support burden when remote access misbehaves. Zero-trust shifts spend toward subscription services and the up-front effort of defining access policies, but it can reduce the ongoing operational drag and shrink your attack surface, which has its own value. For many small and mid-sized organisations the running total ends up comparable, with zero-trust pulling ahead as remote work and cloud adoption grow. The honest comparison is about total cost and risk over a few years, not the sticker price of either option today.

How BSH can help

BSH Technologies designs and rolls out zero-trust access in stages that match your environment, starting with identity and device posture before touching the network. If your VPN has become a bottleneck and a risk, we can help you move to a model that fits how your team works today, without a disruptive big-bang cutover.