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FIRESTARTER

UAT-4356's Cisco ASA/Firepower boot-sequence backdoor; survives all patches, removable only by power cycle.

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#228 Apr
#224 Apr

Persisted through September 2025 patches inside a federal agency until detected in March 2026

Cybersecurity: Threats and Defences: Federal agency stayed compromised six months
#224 Apr

Persisted in Cisco ASA/FTD boot sequence through all patches; activated via crafted WebVPN magic-packet request

Cybersecurity: Threats and Defences: FIRESTARTER implant survives every Cisco firewall patch
#220 Apr