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Cisco Fixed Critical RCE in Nexus 9000 Series Switches
Cisco patched a critical Nexus 9000 vulnerability, CVE-2026-20212, allowing unauthenticated remote root code execution. Cisco has released patches for a critical flaw, tracked as tracked as CVE-2026-20212 (CVSS score of 9. 8) in 10 Silicon One-based Nexus 9000 switches. The vulnerability could let an unauthenticated remote attacker execute code with root privileges. Cisco’s Technical Assistance Center (TAC) discovered the flaw while investigating a customer support case. The flaw exists because TCP ports 43210 and 43211 are exposed through the default Layer 3 VRF. An attacker could connect remotely and send specially crafted data that gets executed with root privileges. The attack could also crash the S1HAL process, potentially forcing the affected device to reload.
Critical Cisco Nexus 9000 Flaw Lets Unauthenticated Remote Attackers Run Code as Root
Cisco has released patches to address a critical security flaw affecting 10 Silicon One-based Nexus 9000 switches that could allow an unauthenticated, remote attacker to execute code as root, alongside an IOS XR hardening release bundling 7 umbrella CVEs, 2 of which are rated 9.8, with no workaround for any IOS XR version. The Nexus vulnerability, tracked as CVE-2026-20212 (CVSS score: 9.8), is
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