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Pull the Plug: FIRESTARTER Survives Patches, Reboots, and Your Incident Response Plan

Summary by Eclypsium
A Linux backdoor hooks the firewall data plane (LINA) on Cisco ASA and Firepower devices, persists through firmware updates, and only a full power cycle gets rid of it. The Patch Is Not the Fix You patched your Cisco ASA. You rebooted it. Your vulnerability scanner shows green. You closed the ticket. However, the backdoor is still there! That is the actual operational reality CISA and the United Kingdom’s National Cyber Security Centre (NCSC) pu…
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Eclypsium broke the news on Thursday, May 7, 2026.
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