By Guru Baran
Publication Date: 2026-07-27 08:12:00
A coordinated wave of exploitation targeting edge VPN and firewall appliances from four major vendors Palo Alto Networks, Fortinet, Citrix, and Check Point has emerged as the dominant initial-access vector for ransomware operators in mid-2026.
Threat actors, including affiliates of the Qilin ransomware-as-a-service (RaaS) operation, are chaining authentication-bypass flaws, credential-harvesting campaigns, and legacy-protocol weaknesses to obtain unauthenticated or credential-free access to corporate perimeters.
Once inside, these actors move rapidly toward lateral movement, data exfiltration, and double-extortion ransomware deployment, often within days of a CVE’s public disclosure.
The campaigns analyzed here span four separate but converging incidents: the “Fortibleed” mass credential-compromise campaign against roughly 75,000 internet-facing FortiGate firewalls;…
