Hackers Exploiting Cisco Firepower Devices’ Using n-day Vulnerabilities to Gain Unauthorized Access

State-sponsored threat actors are actively targeting Cisco Firepower devices by chaining known vulnerabilities to deploy a highly customized backdoor. Cisco Talos recently discovered that the espionage-focused threat group UAT-4356 is exploiting two n-day vulnerabilities, tracked as CVE-2025-20333 and CVE-2025-20362, to infiltrate Firepower Extensible Operating System (FXOS) environments. UAT-4356 previously orchestrated the ArcaneDoor campaign, which successfully […]

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