Today we explore the decline of SSL-VPN usage, the vulnerabilities that have accelerated its obsolescence, and the modern security architectures replacing it.
What Is an SSL-VPN?
An SSL-VPN (Secure Sockets Layer Virtual Private Network) is a type of VPN that uses the SSL protocol to facilitate secure remote access to network resources. SSL-VPNs typically operate through a web browser, making them easy to deploy and use across various devices.
SSL-VPNs became especially popular during the COVID-19 pandemic, as businesses scrambled to enable remote work. During the pandemic, they were a lifeline. They enabled remote access quickly and efficiently, allowing employees to connect to corporate networks from home; and their ease of use and compatibility with existing infrastructure made them a go-to solution for secure access.
As organizations scaled up their remote access capabilities, many did so without fully considering the long-term security implications. SSL-VPNs, while convenient, introduced new vulnerabilities that attackers were quick to exploit.
The Decline of VPN Usage in Business
Recent data from Security.org paints a clear picture of the downward trend in VPN usage in business settings, dropping from 14% in 2021 to just 8% in 2024.
This decline is not just a consumer trend. It reflects a broader shift in business security strategies. Businesses are increasingly recognizing that traditional VPNs, including SSL-VPNs, are no longer sufficient to protect against modern cyber threats because of the increase in security risks associated with them.
The Security Concerns of SSL-VPNs
The vulnerabilities in SSL-VPN implementations have become a favorite target for threat actors. SSL-VPNs operate on a “castle-and-moat” model, where once a user is authenticated, they gain broad access to the network. This model is inherently flawed in today’s environment, where lateral movement by attackers can lead to widespread compromise.
The result? A growing attack surface and diminishing trust in SSL-VPN as a viable security solution.
Consider the recent high-profile exploits:
- Fortinet FortiOS (CVE-2024-21762): A critical out-of-bound write vulnerability in the SSL VPN daemon allows unauthenticated remote attackers to execute arbitrary code, leading to full system compromise. [tenable.com]
- SonicWall (CVE-2024-53704): An authentication bypass vulnerability enables attackers to hijack active SSL-VPN sessions without credentials, granting unauthorized access to internal networks. [bishopfox.com]
- Check Point (CVE-2024-24919): This information disclosure vulnerability allows attackers to read sensitive files on VPN gateways, exposing entire network infrastructures. [tenable.com]
- Ivanti Connect Secure (CVE-2023-46805 & CVE-2024-21887): A chain of authentication bypass and command injection vulnerabilities enables attackers to gain root-level access and persist even after factory resets. [forums.ivanti.com]
These exploits underscore a troubling reality: SSL-VPNs are no longer a safe bet for secure remote access, and the industry is responding decisively. SonicWall, a major SSL-VPN provider, announced it will remove all licenses and support for SSL-VPN services after October 31, 2025. This move is driven by the increasing security risks associated with SSL-VPNs and the availability of more secure alternatives.
Moreover, SSL-VPNs:
- Frequently lack granular access controls
- Are difficult to scale securely
- Often rely on outdated encryption protocols
- Introduce latency and performance bottlenecks
Other vendors are following suit, either deprecating SSL-VPN offerings or shifting focus to modern access solutions like ZTNA and SASE.
The Alternatives: ZTNA and SASE
Zero Trust Network Access (ZTNA)
ZTNA is not just a replacement for VPN—it’s a paradigm shift in how organizations think about access and security. ZTNA is built on the principle of “never trust, always verify.” It is designed to provide brokered access to applications and data, challenging and confirming users and devices before granting access.
Key features of ZTNA include:
- Least-privileged access: Users only access what they need.
- Identity authentication: Verifies user credentials and device posture.
- Employment verification and credential storage: Adds layers of trust.
- Network monitoring: Detects suspicious behavior in real time.
Ultimately, if an attacker compromises a device, ZTNA limits the damage to only the resources that device can access. FusionTek offers Zero Trust solutions to all its clients, because we know this is one of the most secure ways to protect networks from their own users.
Secure Access Service Edge (SASE)
SASE, short for Secure Access Service Edge, is a cloud-based approach that brings together networking and security into one streamlined service. It blends tools like SD-WAN with advanced security features such as firewalls, cloud access controls, and zero-trust access. The goal: to give users and devices secure, reliable access to company resources, regardless of where they’re located, while making it easier for IT teams to manage everything from a single platform.
This unified approach allows organizations to:
- Secure access at both network and application levels.
- Monitor traffic end-to-end.
- Reduce latency and improve performance.
- Simplify management through a single pane of glass.
SASE is particularly well-suited for cloud-first, hybrid work environments, where users and applications are distributed across geographies and platforms.
True Security Requires a Layered Approach
No single solution can eliminate all security risks. That’s why modern cybersecurity strategies emphasize defense in depth.
A layered approach might include:
- ZTNA for secure, granular access.
- SASE for unified network and security management.
- Multi-Factor Authentication (MFA) across all devices and applications.
- Managed Detection and Response (MDR) for threat hunting.
- Endpoint Detection and Response (EDR) for device-level protection.
As the threat landscape continues to evolve, so must the tools and strategies businesses use to defend themselves.
If your business is looking for better layered security protections, reach out to our team today.
SSL-VPNs: The End of An Era
The end of SSL-VPN is just the beginning. SSL-VPNs served their purpose during a critical time, but it seems their time has passed. The vulnerabilities, vendor deprecations, and real-world exploits make it clear: SSL-VPN is no longer a viable solution for secure remote access.
Forward-thinking organizations are embracing ZTNA and SASE to build resilient, scalable, and secure infrastructures. These technologies offer the granularity, visibility, and control needed to thrive in a hybrid, cloud-first world.
The shift away from SSL-VPN isn’t just a trend—it’s a necessary evolution. And for businesses that want to stay ahead of the curve, the time to act is now.
