Cisco Patches Critical Nexus 9000 Silicon One RCE Flaw
Cisco disclosed CVE-2026-20212, a critical vulnerability in the Silicon One integration for Nexus 9000 Series Switches. TCP ports 43210 and 43211 are exposed in the default L3 VRF, letting an unauthenticated remote attacker send crafted input executed as root, potentially crashing S1HAL and reloading the device. Cisco released software updates and workarounds.
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