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May 30, 2016By Rini
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Open Root-Level RCE Flaw in Cisco Nexus 9000 Series Switches Exposes Networks to Complete Compromise — CVE-2026-20212

CVE Research
Root-Level RCE Flaw in Cisco Nexus 9000 Series Switches Exposes Networks to Complete Compromise — CVE-2026-20212
CVE-2026-20212 is a critical vulnerability in Cisco Nexus 9000 Series Switches that use Silicon One ASICs. It allows an unauthenticated remote attacker to execute code with root privileges by sending crafted input to TCP ports 43210 and 43211, which are reachable in the default Layer 3 VRF. Exploitation can also crash the S1HAL process and force a device reload. This article covers how the vulnerability works, the affected product identifiers, its potential impact, available workarounds, and how to identify fixed software using the Cisco Software Checker.



