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CVE-2026-20212 is a critical unauthenticated remote code execution vulnerability in the Silicon One integration of affected Cisco Nexus 9000 Series Switches. TCP services on ports 43210 and 43211 are exposed through the default Layer 3 VRF, allowing a remote attacker to submit crafted input that is executed with root privileges. Crafted input may also crash the S1HAL process, causing the switch to reload.
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A critical CVSS 9.8 vulnerability in Cisco Nexus 9000 series switches that permits remote attackers to access default-exposed TCP ports and execute code with root privileges.
A critical unauthenticated remote code-execution vulnerability affecting Cisco Nexus 9000 Series Switches equipped with a Silicon One ASIC. Default Layer 3 VRF configuration exposes TCP ports 43210 and 43211; crafted input sent to the vulnerable service can execute with root privileges. Exploitation could also crash the S1HAL process, reload the switch, and cause a network outage.
An unauthenticated remote code-execution vulnerability in the Silicon One integration of Cisco Nexus 9000 Series Switches. Crafted input sent to exposed TCP ports 43210 or 43211 may execute with root privileges; exploitation may also crash S1HAL and reload the device.
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Cross-references every affected SKU, including bundled OEM variants.
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