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Arcane Door Reopened: The Cisco Firepower Backdoor That Only a Hard Reboot Can Kill

FortiClient EMS exploitation Cisco FIRESTARTER Backdoor Arcane Door Campaign Dell RecoverPoint Zero-Day UNC6201 Espionage Notepad++ Compromise Supply Chain Attack Magento SessionReaper CVE-2025-54236 ShadowRay 2.0, AI-Generated Malware WordPress Auth Bypass, CVE-2025-5947 Exploited EcoStruxure Vulnerabilities, Industrial Control System UNC5820 - CVE-2014-2120 - CVE-2021-44207

Arcane Door Reopened: The Cisco Firepower Backdoor That Only a Hard Reboot Can Kill

Do Son April 24, 2026

Cisco Talos uncovers the FIRESTARTER backdoor in Arcane Door's latest attack on Firepower devices. Patch CVE-2025-20333 now to stop state-sponsored espionage.

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