Coordinated Attacks and Zero-Day Exploitation Targeting Cisco, Palo Alto, and Fortinet Network Devices

A coordinated cyberattack campaign has been identified targeting major networking devices from Cisco, Palo Alto Networks, and Fortinet, with evidence suggesting a single threat actor is orchestrating the activity. Security researchers at GreyNoise observed simultaneous scanning of Cisco ASA devices, increased login attempts against Palo Alto Networks portals, and brute-force attacks on Fortinet SSL VPNs, all originating from shared subnets and exhibiting recurring TCP fingerprints. This temporal and infrastructural correlation points to a sophisticated, cross-vendor campaign rather than opportunistic attacks. Experts note that adversaries are leveraging generative AI to automate these attacks, adopting tactics typically associated with nation-state actors. The campaign is notable for its focus on high-value targets such as networking devices and VPNs, which serve as critical gateways into enterprise networks and often possess privileged access that can bypass internal security controls. Industries such as manufacturing, industrials, and utilities are particularly at risk due to the potential for operational disruption and rapid financial gain for attackers. Concurrently, Cisco disclosed two zero-day vulnerabilities in its ASA and Secure Firewall Threat Defense software, identified as CVE-2025-20333 and CVE-2025-20362, which are being actively exploited in the wild. CVE-2025-20333 allows authenticated remote code execution due to improper input validation in the VPN web server, potentially granting attackers root-level access. CVE-2025-20362 is an authentication bypass flaw that enables remote attackers to access restricted endpoints without credentials. The combination of these vulnerabilities poses a severe risk, as attackers can gain full control of affected devices. Cisco’s Product Security Incident Response Team (PSIRT) has confirmed ongoing exploitation and is collaborating with government agencies to coordinate a response. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has issued an emergency directive, urging all federal agencies to immediately mitigate exposure and assess for compromise. Over 90,000 Cisco FTD devices are reportedly exposed, highlighting the scale of the threat. Attackers are conducting large-scale scanning campaigns to identify vulnerable ASA login portals and entry points. Security experts emphasize the urgent need for organizations to inventory their Cisco ASA and FTD devices, apply available patches, and implement recommended mitigations. The campaign’s use of shared infrastructure and advanced automation underscores a shift in attacker methodology toward more efficient and targeted operations. The strategic targeting of network infrastructure devices reflects their critical role in enterprise security and the high impact of successful compromise. Organizations are advised to monitor for signs of compromise, follow vendor and government guidance, and prioritize remediation of affected systems. The ongoing nature of the attacks and the active exploitation of zero-day vulnerabilities make this a critical threat to enterprise and government networks worldwide.