If your organization is using SonicWall SSL VPN, this is the official vendor recommendation - "SonicWall urges admins to disable SSLVPN amid rising attacks" - to tackle the recent zero-day vulnerability.

Since mid-July 2025, SonicWall has been targeted by the Akira ransomware group, exploiting a zero-day flaw in their SSL VPNs. We, at NetBird, have repeatedly highlighted why traditional VPNs are flawed.

Traditional VPN Architecture

NetBird Zero Trust Network Access Architecture

This recent zero-day vulnerability highlights the urgency for organizations to consider migrating to NetBird - a decentralized, WireGuard-based Zero Trust Network Access solution, to effortlessly protect their networks and relieve them from unending patch cycles and CVE vulnerabilities.

The Inherent Architectural Flaw of Traditional VPNs

The traditional, centralized VPN architecture is a publicly exposed gateway, always listening for connections. This means that you’re constantly defending a large attack surface that can never be fully secured. Every vulnerability, be it the most recent Akira ransomware attack or the CVE-2024-53704 (an Improper Authentication vulnerability in the SSLVPN authentication mechanism allows a remote attacker to bypass authentication.), leaves the main door to your entire network wide open to adversaries.

So, is constant patching an answer? It’s been observed by Arctic Wolf researchers that, “In some instances, fully patched SonicWall devices were affected following credential rotation. Despite [time-based one-time password] [multi-factor authentication] being enabled, accounts were still compromised in some instances.” This is a cause for concern, because:

Even patched devices were successfully attacked: The Akira ransomware campaign compromised even fully patched SonicWall devices, even after credential rotation.

MFA bypassed: The attacks succeed even when multi-factor authentication (MFA) is enabled. This means that a pre-authentication exploit renders your most important security control useless. The attack targets the infrastructure, not the user's identity.

Urgent Vendor Guidance: SonicWall has advised their customers to disable SSL VPN services as a primary mitigation for the on-going zero-day vulnerability.

What’s the way forward? The path forward involves adopting a solution that adheres to the core tenets of Zero Trust. By implementing a Zero Trust approach with NetBird, your internal resources become invisible to the public internet, thereby eliminating this attack surface entirely.

Switch to NetBird’s Zero Trust Architecture

NetBird is an open-source Zero Trust Networking platform designed by engineers, for engineers. NetBird makes it radically simple to deploy secure private networks for modern organizations. Built on the trusted, high-performance WireGuard® protocol, NetBird eliminates the limitations of traditional VPNs by establishing high-throughput, low-latency decentralized private networks. NetBird’s robust architecture provides a single, intuitive management console to enforce granular, identity-based access policies, integrating with your existing Identity Provider (IdP) for SSO and MFA.

Switch From Centralized to De-Centralized

NetBird eliminates the slow, centralized VPN gateway architecture with decentralized, encrypted overlay networks that connect your devices securely, eliminating bottlenecks and single points of failure. Unlike traditional centralised VPNs, which backhauls all traffic through a central appliance, NetBird facilitates direct, encrypted tunnels between peers for faster, more resilient connections.

Built on WireGuard®: The Foundation of Speed, Security and Reliability

NetBird, built on the trusted WireGuard® protocol, simplifies secure connectivity between devices, teams, and cloud environments - your computers, devices, machines, and servers connect to each other directly over a fast encrypted tunnel. Why WireGuard®? Because it is lean, fast, and secure by design.

Built on the Foundations of Zero Trust

NetBird is a native ZTNA solution that operates on the principle of "never trust, always verify".

Identity-aware security: Access is tied to user and device identity, not IP addresses. NetBird integrates with your Identity Provider (IdP) to enforce SSO and MFA policies natively. Least-privilege access: Granular, group-based access policies define exactly which users can connect to which resources, on which ports, preventing the lateral movement that is common in traditional VPNs. Cloaked attack surface: NetBird establishes encrypted tunnels between your user devices and routing peers without a need for open ports, effectively ‘cloaking’ your critical resources from the public internet. This means that your critical resources will no longer have their public IPs exposed, to be scanned, probed or exploited by adversaries. Continuous verification: For stronger security, NetBird supports posture and context checks — the foundation of a strong Zero Trust approach. With posture checks, you can restrict access based on the state or attributes of peers:

• NetBird client version — allow only peers running approved versions
• Country & region — allow or block access based on geographic location
• Operating system — allow/deny access based on OS type and version
• Process — verify that specific processes are running on the peer before granting access, E.g. Windows Defender

With contextual access control, you can enforce dynamic, policy-based controls, based on: Identity (who), the resource accessed (what), geolocation (where), and network environment (how).

NetBird vs SonicWall SSL VPN, At-a-Glance:

While traditional VPNs like SonicWall SSL VPN have been workhorses of corporate networking for many years, their architectural and security models are no longer suitable for modern organizations dealing with sophisticated adversaries. NetBird, built from the ground up on the principles of Zero Trust, and leveraging modern technologies like WireGuard®, offer a more secure, efficient, agile, and scalable path forward.

Talk to us - We will help you switch to NetBird seamlessly, with minimal disruption.