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Cisco Security Advisoriescisco-sa-n9k-s1-rce-EH8dEtr

Cisco Nexus 9000 Series Switches Silicon One Remote Code Execution Vulnerability

A vulnerability in the Silicon One integration for Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to execute code with root privileges. This vulnerability exists because TCP ports 43210 and 43211 are accessible in the default Layer 3 (L3) virtual routing and forwarding (VRF). A successful exploit could allow the attacker to connect to an affected device and send crafted input that could be executed as code with root privileges. The exploitation of this vulnerability could also cause the S1HAL process to crash, which could cause the device to reload. Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9k-s1-rce-EH8dEtr Security Impact Rating: Critical CVE: CVE-2026-20212

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CriticalCVSS not listedCritical severity
Scope

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Cisco has released software updates that address this vulnerability.

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Vulnerabilities

CVEs named in this advisory

CVE-2026-20212View CVSS, KEV, EPSS, and threat context
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