A subset of Insyde-based firmware may leave an embedded UEFI shell reachable despite Secure Boot.

Affected OEMs, models, builds and shipped fixes are not public.

Sources

ResearchCisco UCS and UCS-Based Appliances UEFI Shell Secure Boot Bypass Vulnerability - Cisco SecondaryCERT/CC Vulnerability Note VU#718077

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Every finding here carries a source that was checked before it published. If something is wrong, write to admin@fullchain.sh — corrections are published on the day they affect.

Wednesday, September 9, 2026