Why an SSL VPN Is No Longer Enough

For years, SSL VPNs have been the go-to solution for remote access. They’ve helped businesses stay connected, supported the rise of hybrid work, and offered a seemingly simple way to extend network access beyond the office walls. However, this reality is shifting, and fast!

SSL VPN stands for ‘Secure Sockets Layer Virtual Private Network’. It’s a technology that allows users to securely access a private network, e.g., a company’s internal systems, over the internet using standard web browsers and encryption protocols.

In simple terms an SSL VPN works by:

Encrypting internet traffic when a user connects to internal systems using SSL (or its modern successor, Transport Layer Security, ‘TLS’).

This encrypted tunnel allows the user to access internal resources as if they were physically inside the corporate network.

It’s often used for remote work, enabling employees to access files, applications, and systems from outside the office.

However, the digital landscape we’re faced with today is vastly different from the one SSL VPNs were designed for. Cyber threats are more sophisticated, workforces are more distributed, and cloud adoption is accelerating.

What we’re beginning to see in this new world is that SSL VPNs are starting to show their age. In fact, some vendors have already begun removing support for SSL VPNs in their latest releases, which is a clear sign the industry is moving on.

SSL VPNs are becoming a liability

Conversely, while SSL VPNs are the very tools many businesses rely on for secure remote access, they have also become a prime target for cyber attackers. The problem is their architecture (which was once considered robust) is now riddled with vulnerabilities that are being actively exploited. Indeed, high-profile breaches involving major vendors like Fortinet have sadly exposed just how fragile these systems can be.

The issue lies in how SSL VPNs are designed. When a user connects via VPN, they’re often granted broad access to the entire network. That means even if their intent is to access a single application, they’re effectively inside the perimeter, with visibility into far more than they need. As you can imagine, this ‘over-privileged’ access creates a significant risk surface.

Worse still, VPN tunnels can bypass many of the security controls you’ve worked hard to implement. You see, once inside, users – and potentially attackers – can move laterally across the network, making it harder to detect and contain threats. It’s like opening a door into your entire house, without knowing who’s walking through or what they’re doing once inside. VPN gateways are also publicly accessible by design, meaning they’re sitting ducks for attackers scanning the internet for easy entry points.

This goes way beyond theory too. Exploits targeting SSL VPNs have been weaponised in the wild, leading to data breaches, ransomware infections, and costly downtime.

SSL VPNs versus Zero Trust

One thing to remember: SSL VPNs are fundamentally misaligned with the way modern security is evolving.

Today, the dominant model is Zero Trust, which operates on a simple but powerful principle: “Never trust, always verify.” Zero Trust assumes that no user, device, or connection should be trusted by default, even if it’s inside the network. Instead, access is granted based on identity, device posture, and context – and only to the specific resources required in that situation.

SSL VPNs, on the other hand, are built on an outdated perimeter-based model. They assume that once a user is inside the network, they can be trusted. This implicit trust is exactly what Zero Trust aims to eliminate.

As organisations embrace cloud services, remote work, and distributed teams, the ‘perimeter’ has all but disappeared. Security needs to be dynamic, context-aware, and granular instead. SSL VPNs simply can’t deliver that. They lack continuous verification, struggle with cloud scalability, and violate the principle of least privilege.

It’s really no wonder that Gartner predicts 70% of new remote access deployments will rely on Zero Trust Network Access (ZTNA) by 2025. The writing is on the wall: SSL VPNs are being replaced by solutions that align better with modern security frameworks.

The digital user experience (DEX) challenge

Security isn’t just about keeping threats out; it’s also about enabling productivity – and here’s where SSL VPNs fall short once again.

Ask anyone who’s used a VPN regularly, and you’ll hear the same complaints: slow connections, frequent disconnects, and clunky login processes. This happens because VPN traffic is often routed through central concentrators, creating bottlenecks that slow down cloud applications. Users are also required to manually launch VPN clients, reconnect when switching networks, and deal with session drops that interrupt their work – all things that chip away at productivity, frustrate users, and ultimately make remote work feel harder than it should be.

These days, employees expect seamless access from anywhere, and this kind of friction is more than an inconvenience, it’s a real productivity killer. It can even drive users to seek workarounds, like using personal devices or unsanctioned apps, which, of course, only introduces further security risks.

ZTNA, by contrast, offers a much smoother experience. Because it grants access at the application level and uses identity-based authentication, users can connect securely without jumping through hoops. In short, it’s faster, more reliable, and better suited to the way people work today.

ZTNA as the modern alternative

As briefly mentioned above, ZTNA stands for ‘Zero Trust Network Access’. It’s a modern approach to remote access that enforces strict verification and grants access only to specific applications, not the entire network.

Good things about ZTNA are that it’s adaptive, context-aware, and built for scalability. ZTNA solutions evaluate user identity, device health, location, and other factors before granting access, and they continue to monitor sessions for suspicious activity. This means, if something changes – say, a user suddenly tries to access a sensitive application they’ve never used before, or their device starts behaving suspiciously – ZTNA can respond immediately. It might prompt for re-authentication, restrict access, or even terminate the session altogether.

For security teams, this means real-time visibility into user activity, better detection of anomalies, and faster response to threats. For users, it’s largely invisible; there’s no disruption unless something genuinely suspicious occurs.

There are several leading ZTNA providers in the market today, each with their own strengths, so it’s worth discussing these with a trusted partner before deciding:

Microsoft Entra Private Access integrates tightly with Entra ID and offers identity-centric access.

Zscaler Private Access is cloud-native and excels in secure service edge (SSE) environments.

Palo Alto Prisma Access combines ZTNA with SASE for comprehensive protection.

Fortinet Universal ZTNA leverages existing FortiGate infrastructure for seamless integration.

Cisco Secure Client with Duo adds multi-factor authentication and device trust to the mix.

All these solutions are designed to meet the needs of modern businesses, whether fully cloud-based, hybrid, or somewhere in between.

So, what’s next?

Transitioning away from SSL VPN doesn’t have to be daunting. The key is to start with a clear understanding of where you are today and where you want to go.

Begin by assessing your current remote access setup. Is your SSL VPN still supported by your vendor? Are users getting only the access they need? Is multi-factor authentication enforced? What conditional access policies are in place?

Next, consider your Zero Trust strategy. Have you started exploring ZTNA solutions? Do you have a roadmap in place? If not, this is the perfect time to start that conversation with your IT teams and perhaps a service provider.

Rest assured, if a full migration to ZTNA isn’t feasible right away, there are interim steps you can take. For example, migrating to IPSec over port 443 has been shown to offer better security than traditional SSL VPN. You can also tighten access controls, enforce MFA, and reduce over-privileged access as part of a short-term mitigation plan.

Ultimately, the goal should be to move to a ZTNA solution that aligns with your business objectives. Whether you’re looking for improved security, better user experience, or future-proof infrastructure, ZTNA delivers on all fronts.

Final word

SSL VPNs had their moment. They helped businesses adapt to remote work and kept things running during uncertain times. But the world has moved on and this means so should your security strategy.

Remember, Zero Trust isn’t just a trend. It’s a fundamental shift in how we think about access, identity, and trust – ZTNA is the technology that brings this to life.

If you’re ready to rethink your remote access strategy, Littlefish is here to help. Start the conversation by getting in touch today and we can help build a roadmap that gets you where you need to go.