Imagine a sales rep logging into the office VPN from their personal laptop at a cafe, not realizing the device is already infected with malware. The moment the initial authentication succeeds, they get a path into nearly the entire internal network, from file servers to finance systems, even though all they actually needed was the CRM.
According to the Zscaler ThreatLabz 2026 VPN Risk Report, 63% of users actually choose to bypass official VPN controls to access applications faster. Habits like this open up access gaps that are hard for security teams to monitor, especially while an incident is already underway.
The situation above is one reason the ZTNA vs VPN comparison has been searched more and more often by corporate IT and security teams lately. This article covers both thoroughly, from how they work, to their risks, to when each approach is the right fit.
What Is a VPN and How Does It Work?
VPN, or Virtual Private Network, is a technology that forms an encrypted “tunnel” between a user’s device and the office network. Once this tunnel is formed, the user’s device effectively becomes part of the internal network itself, complete with access to the various resources inside it.
The VPN security model rests on the concept of a perimeter, like a fence surrounding one area. Anyone who successfully passes the authentication gate at the start of the connection is automatically trusted fully for the rest of the session, with no re-checking.
Three elements make up how a VPN works: one-time authentication at the start of the connection, encryption of data passing through the tunnel, and assignment of an internal IP address to the connected device. Once these three elements are in place, the user essentially gets a direct path into the network, similar to a LAN cable run from the office all the way to their house.
This technology was popular for years because it’s simple to implement and was sufficient for an era when most applications still ran on on-premise servers. The problem is, that same way of working becomes a weakness the moment a company starts using dozens of cloud applications at once.
As an illustration, an HR staff member who logs into the VPN to open payroll can actually also “see” the printer server, the backup server, even other office IoT devices, even though they never need them. This overly broad scope of access is VPN’s main weak point.
What Is ZTNA and What Principle Underlies It?
ZTNA (Zero Trust Network Access) is an access approach that rejects the assumption of “once you’re in, you’re trusted.” Every access request, whether from inside or outside the network, is still re-verified based on user identity, device condition, and the context at the moment the request is made.
The core principle is often called “never trust, always verify.” Instead of opening up the entire network, ZTNA only forms a path to one specific application that the user is actually permitted to use, while other applications remain hidden and completely invisible from the outside.
Because verification runs continuously, not just at the start of a session, ZTNA can cut off access immediately the moment something suspicious changes. For example, if a device is suddenly flagged with malware in the middle of a work session, access to the application can be revoked immediately without waiting for the session to end.
This approach is why ZTNA is often described as the foundation of a broader zero trust architecture, and it typically runs alongside the SASE (Secure Access Service Edge) framework. Both place identity, not network location, at the center of access decisions.
Take the same HR staff member from the VPN section. With ZTNA, they can only see and open the payroll application that’s actually their job, while the printer server, backup server, and other devices on the network don’t appear in their access list at all.
The Main Differences Between ZTNA and VPN
From the two explanations above, it’s clear that VPN and ZTNA start from different security philosophies. To make the comparison easier to digest, the table below summarizes the aspects IT teams most often weigh when choosing between the two.
| Aspect | VPN | ZTNA |
|---|---|---|
| Trust model | Fully trusted after initial authentication | Continuous verification on every access request |
| Access scope | Entire internal network | Only specific permitted applications |
| Network visibility | Network appears as one large whole | Each application is hidden and managed separately |
| Impact if credentials are stolen | Attacker can move laterally across the whole system | Attacker’s access is limited to the one leaked application |
| Fit for cloud and hybrid | Needs complicated additional configuration | Designed natively for cloud and hybrid environments |
| User experience | Often slows down under heavy traffic | Traffic is routed directly to the destination application |
This table doesn’t mean VPN always loses on every aspect. For very simple access needs that have run stably for a long time, VPN can still sometimes be adequate, something covered further in the closing section of this article.
Security Risks That Still Cling to VPN
The general picture in the table above becomes more tangible when viewed through real incidents in the field. Below are some of the gaps attackers most often exploit when an organization still relies on VPN as its only layer of remote access.
Overly broad network access. One leaked VPN credential can open the door to the entire system, not just one application. The HR staff case mentioned earlier is an example, where someone who only needs payroll can still “see” other servers.
Blind spots in encrypted traffic. Still according to the Zscaler ThreatLabz 2026 VPN Risk Report, one in three organizations doesn’t inspect its encrypted VPN traffic at all. That means suspicious activity can pass straight through without ever being detected.
Slow security-patching cycles. Many VPN appliances take weeks to receive critical security patches, while automated AI-driven exploitation moves far faster. This time gap is exactly what attackers often exploit before a system gets updated.
Single point of failure. The moment a VPN gateway goes down or gets breached, all employees’ remote access is disrupted at once. This is different from ZTNA architecture, which doesn’t depend on a single entry point.
Difficulty with audit and tracking. Because all traffic passes through the same tunnel, figuring out who accessed what and when often takes a long time. For compliance teams, this becomes extra work that eats up significant time every time an audit comes around.
Why Global Organizations Are Starting to Shift to ZTNA
The risks above aren’t just theory on paper. Their impact becomes clear once you calculate them in terms of financial loss, and this is where the business case for switching to ZTNA gets stronger.
The IBM Cost of a Data Breach Report 2025 recorded the global average cost of a data breach at USD 4.44 million. This figure covers investigation costs, system recovery, customer notification, and potential regulatory fines, cost components that can be pushed down further through ZTNA-style least-privilege access restrictions.
Beyond cutting potential losses, ZTNA also brings a number of operational advantages that IT teams feel directly, day to day.
Automatic micro-segmentation. Each application is treated as a separate zone, so an attacker can’t “jump” from one system to another. A breach in the CRM application, for instance, doesn’t automatically open access to the company’s finance system.
Applications hidden from the public internet. ZTNA doesn’t publish application IP addresses to the internet, unlike VPN gateways, which tend to be a favorite target for automated scanning. In practice, a company’s internal applications become far harder for outside attackers to find.
Fit for hybrid work and multi-cloud. Employees can access applications on AWS, Azure, or on-premise servers through one consistent access policy. IT teams no longer need to manage a bunch of separate VPN configurations for each environment.
A smoother user experience. Because traffic is routed straight to the destination application without passing through extra network “hops,” the connection feels far more responsive. This also reduces employees’ reasons for looking for shortcuts outside official company controls, as seen in the data at the start of this article.
Common Misconceptions About ZTNA vs VPN
Before getting into usage recommendations, there are a few mistaken assumptions that often lead companies to make the wrong decision. Straightening these out matters so that a migration to ZTNA doesn’t stall halfway through because of the wrong expectations from the start.
The first misconception: ZTNA is treated as a single product you just install and you’re done. In fact, ZTNA is an architectural approach that first needs to be mapped out, which applications are critical, who’s entitled to access them, and what policy applies to each of those combinations.
The second misconception: many assume VPN has to be switched off immediately once ZTNA is implemented. In practice, most organizations run both side by side during the transition period, especially for legacy applications that aren’t yet ready to be fully integrated into the zero trust model.
When Does a Business Need ZTNA, VPN, or a Combination of Both?
Even though ZTNA has plenty of advantages, that doesn’t mean VPN instantly loses relevance in every situation. The choice should be adapted to business scale, the types of applications in use, and the level of risk the company faces.
Small businesses with simple access needs. If a team only needs to access one file server from a few fixed locations, a standard VPN may still be adequate for the time being. It still needs to be paired with strict access policies, though, so the risk doesn’t spread.
Companies with many cloud applications and distributed teams. This is where ZTNA has the edge, since each application can be given its own access policy without opening up the entire network. An example is a company with sales, finance, and engineering teams that each only need access to different applications.
Organizations under strict regulation. Sectors like banking or healthcare are typically required to demonstrate detailed access controls that can be audited at any time. ZTNA makes it easier to track who accessed what, when, and from which device, something far harder to do with a conventional VPN.
The transition period toward full zero trust. Many organizations choose to run VPN and ZTNA side by side during migration, especially for legacy systems that aren’t ready to be moved yet. A phased approach like this helps reduce the risk of operational disruption while the move is underway.
Conclusion: ZTNA vs VPN, Which Is Right for Your Business?
In the end, the ZTNA vs VPN comparison isn’t about which one is “more advanced,” but about which security philosophy fits how your business actually operates today. VPN can still work for simple access needs, but its full-trust model is getting harder to rely on amid threats that move as fast as AI does.
ZTNA answers that gap through continuous verification and access kept as tight as possible, so one leaked credential doesn’t automatically open the entire network. The more complex a company’s working environment gets, whether in the number of cloud applications or how spread out its teams are, the stronger the case for starting to consider a migration to ZTNA.
Accelist Adaptist Consulting offers Adaptist PRIME to help companies implement zero trust-based access architecture without having to tear down their entire existing infrastructure. The Adaptist Consulting team can help you map out critical applications, design least-privilege access policies, and ensure the transition from VPN to ZTNA happens gradually with minimal operational disruption.
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FAQ
The two can run side by side. Most organizations keep VPN active for legacy applications while gradually shifting other applications to ZTNA during the transition.
No. ZTNA works as an access layer added on top of the existing infrastructure, so companies don’t need to tear down systems that are already running.
Not necessarily. ZTNA is more valuable the more cloud applications and distributed teams a company has, but small businesses with simple, stable access needs may still find VPN adequate for now.
