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CVE-2026-20212 is a critical vulnerability in the Silicon One integration of selected Cisco Nexus 9000 Series Switches equipped with Silicon One ASICs. A privileged service is bound to TCP ports 43210 and 43211 and is reachable through the default Layer 3 VRF. An unauthenticated remote attacker who can reach either service can submit crafted input that is executed as root. The issue is classified as CWE-1327, Binding to an Unrestricted IP Address.
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Critical (CVSS 9.8) unauthenticated remote-code-execution vulnerability in the Silicon One ASIC integration service on affected Cisco Nexus 9000 Series switches. The service is reachable in the default Layer 3 VRF on TCP ports 43210 and 43211; crafted input can execute with root privileges and may crash the S1HAL process, causing a device restart.
A critical CVSS 9.8 unauthenticated remote code-execution vulnerability in Cisco Nexus 9000 switches containing Silicon One ASICs. Exposure of TCP ports 43210 and 43211 through the default Layer 3 VRF may let an attacker execute code as root; exploitation may also crash the S1HAL process and require the device to reload.
A critical unauthenticated network-based root remote code execution vulnerability caused by unintended exposure of a privileged Silicon One service on TCP ports 43210 and 43211. It affects selected Cisco Nexus 9000 Silicon One-based switches running affected NX-OS releases and can also cause denial of service by crashing the S1HAL process.
A critical (CVSS 9.8) unauthenticated remote code-execution vulnerability in Silicon One hardware integration on select Cisco Nexus 9000 switches. Services bound to unrestricted IP addresses listen on TCP ports 43210 and 43211 in the default Layer 3 VRF; a reachable attacker can submit crafted input to execute code as root. Exploitation can also crash S1HAL and reload the device.
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Cross-references every affected SKU, including bundled OEM variants.
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