Ransomware Groups Are Exploiting VPN Vulnerabilities at Scale — Is Your Network at Risk?

Why VPN Vulnerability Ransomware Attacks Are Surging in 2026

Ransomware operators have found a repeatable and devastatingly effective playbook: locate an unpatched VPN or firewall appliance sitting on the edge of a corporate network, exploit a recently disclosed vulnerability, and gain direct access to everything behind it. Security researchers are now sounding alarms as this tactic accelerates, with multiple high-profile ransomware groups — including Qilin, The Gentlemen, and Akira — systematically targeting known flaws in some of the most widely deployed network security products in the world.

The most recent and striking example involves a critical authentication bypass vulnerability in Palo Alto Networks' GlobalProtect portal and gateway — tracked as CVE-2026-0257. According to Arctic Wolf Labs, this flaw became the common thread across a wave of intrusions in June, with active exploitation beginning just days after public disclosure. The attackers deployed the Qilin ransomware strain, and the tactics varied significantly between victims — ranging from rapid encryption-only operations to full double-extortion campaigns, which Arctic Wolf researchers say "possibly suggests multiple affiliates operating under the Qilin ransomware-as-a-service (RaaS) umbrella."

For IT decision makers, privacy professionals, and enterprise security teams, this is no longer a theoretical threat. It is a well-organized, financially motivated campaign targeting infrastructure that nearly every organization depends on. Understanding the scope of this threat — and what concrete steps can mitigate it — has never been more urgent.

Which VPN and Firewall Products Are Under Active Attack?

The Palo Alto GlobalProtect vulnerability is only the latest in a growing list of exploited edge devices. NCC Group's latest Quarterly Cyber Threat Intelligence Report identifies Qilin as the most active ransomware threat group in Q2 2026, responsible for 14% of all tracked attacks. But Qilin has not limited itself to Palo Alto products. Researchers confirm the group has also exploited flaws in Fortinet's FortiGate, Citrix NetScaler, and Check Point Remote Access VPN products.

The breadth of targeted platforms is significant for security teams that may assume vendor diversity protects them. It does not. Each of these platforms has seen active exploitation in recent months:

• Palo Alto GlobalProtect: CVE-2026-0257 authentication bypass exploited within days of disclosure, leading to Qilin ransomware deployment.
• Fortinet FortiGate: The "Fortibleed" credential-compromise campaign exposed 75,000 FortiGate firewalls in June alone, according to CSO Online reporting.
• Citrix NetScaler: A CitrixBleed-like flaw in NetScaler devices came under attack before Citrix issued patches in early July.
• Check Point Remote Access VPN: Check Point warned in June of ransomware attacks targeting VPNs still using the deprecated Internet Key Exchange version 1 (IKEv1) protocol.
• Cisco and Ivanti products: Akira, ranked fourth on NCC Group's threat list with 127 victims in Q2 2026, primarily exploits vulnerabilities in Ivanti, Cisco, and Fortinet products.

The Gentlemen, ranked second on NCC Group's list with 238 victims in Q2 2026, specifically favors breaking into organizations through firewalls, VPNs, and internet-exposed systems — with a particular focus on FortiGate and Cisco products. This is not opportunistic scanning; it is targeted, intelligence-driven exploitation of known weaknesses in high-value network infrastructure.

Why Are VPNs and Edge Devices So Attractive to Ransomware Operators?

To understand why ransomware groups are converging on VPN and firewall vulnerabilities, you need to think like an attacker. VPNs and other internet-facing edge devices occupy a uniquely privileged position in enterprise architecture. They sit at the boundary between the public internet and the internal network, they handle authentication, and they often operate with elevated privileges. Compromising one does not just give attackers a foothold — it frequently gives them the keys to bypass endpoint detection controls and move laterally through the network with minimal friction.

Alexander Leslie, a senior advisor at cyber threat intelligence firm Recorded Future, points to another compounding factor: the exploitation window. "In some cases, exploitation begins before organizations have had sufficient time to apply vendor guidance, leaving security teams with a very narrow window to respond," Leslie notes. This is the reality that made the Palo Alto GlobalProtect exploitation so damaging — attackers moved within days of disclosure, before many organizations had even assessed whether they were vulnerable.

What makes edge device exploitation particularly insidious is that attackers often do not even need to exploit a vulnerability in the traditional sense. Dray Agha, senior manager of security operations at managed detection and response firm Huntress, notes that while internet-facing VPNs are the site of initial access approximately 70% of the time for advanced threat actors, the dominant method is not technical exploitation — it is credential abuse. "Overwhelmingly, they are not exploiting for access; rather they are using stolen credentials to authenticate to non-MFA'd [multi-factor authentication] user accounts," Agha explains.

This means that even organizations running fully patched VPN appliances remain at serious risk if they have not enforced multi-factor authentication across all VPN access points. Stolen credentials purchased on criminal marketplaces or harvested through phishing can be used to silently authenticate to a legitimate VPN endpoint, leaving no obvious exploit signature for security tools to detect.

How the Top Ransomware Groups Compare in Their Edge Device Targeting

The data makes clear that this is not a single-group phenomenon. Multiple well-resourced ransomware operations have independently converged on the same attack surface. NCC Group's Matt Hull, VP and head of cyber intelligence and response, frames it clearly: "Although there has not been a material rise in ransomware volume in the last quarter, the trajectory of attacks continues upwards, and VPNs remain an increasingly attractive target." The consistency of this targeting across independent groups suggests that VPN exploitation has become a core competency of the modern ransomware industry, not a niche tactic.

Beyond VPNs: The Wider Crisis in Network Edge Security

It would be a mistake to frame this exclusively as a VPN problem. Security researchers and threat intelligence professionals increasingly describe a systemic crisis in network edge security, driven by what experts characterize as basic and readily preventable vulnerabilities in devices that organizations trust implicitly to protect their perimeters.

The scale of the issue extends well beyond VPN appliances. Routers, load balancers, remote access gateways, and web application firewalls all share the same fundamental exposure: they are continuously internet-facing, they handle authentication and access control, and they are often poorly integrated into standard vulnerability management workflows. Many organizations patch their endpoint devices and servers on regular cycles but treat edge appliances as "set and forget" infrastructure — an assumption that ransomware operators have learned to exploit systematically.

The Clop ransomware gang's campaign — which saw the group hack hundreds of companies by exploiting zero-day vulnerabilities in Oracle's E-Business Suite software — is a reminder that the edge device problem is part of a broader pattern. Ransomware operators are consistently investing in the research and weaponization of vulnerabilities in the foundational infrastructure layer, precisely because this layer is often less rigorously monitored than endpoints and servers.