FIRESTARTER Backdoor Hit Federal Cisco Firepower Device, Survives Security Patches post, april 24, 2026mei 18, 2026 The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has revealed that an unnamed federal civilian agency’s Cisco Firepower device running Adaptive Security Appliance (ASA) software was compromised in September 2025 with a new malware called FIRESTARTER. FIRESTARTER, per CISA and the U.K.’s National Cyber Security Centre (NCSC), is assessed to be a backdoor designed for remote access and control. It’s believed to be deployed as part of a “widespread” campaign orchestrated by an advanced persistent threat (APT) actor to obtain access to Cisco Adaptive Security Appliance (ASA) firmware… FIRESTARTER Backdoor Hit Federal Cisco Firepower Device, Survives Security Patches: FIRESTARTER Backdoor Hit Federal Cisco Firepower Device, Survives Security Patches vulnerability 2026