Cisco UCS UEFI Shell Flaw Enables Secure Boot Bypass
Cisco disclosed CVE-2026-20293, a high-severity UEFI Shell vulnerability in UCS Servers and UCS-based appliances. Because memory write commands remain available while UEFI Secure Boot is enabled, an authenticated user or admin, or an unauthenticated attacker with physical access, can modify UEFI memory variables and execute unauthorized software. Cisco released software updates; no workarounds exist.
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