CVE-2026-20212
CriticalCVSS 9.8Summary
A vulnerability in the Silicon One integration for Cisco Nexus 9000 Series Switches allows an unauthenticated remote attacker to execute code with root privileges. TCP ports 43210 and 43211 are accessible in the default L3 VRF, and crafted input can lead to code execution or crash of the S1HAL process causing device reload.
Risk Assessment
The risk is critical because an attacker can gain full control over the network device, potentially compromising network integrity, intercepting traffic, or causing service disruption.
Recommendation
Apply Cisco's patches immediately and restrict access to ports 43210 and 43211 to trusted sources only.
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Original NVD description (English source)
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.