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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2026-0436
Cisco Nexus 9000 Series Switches Silicon One Remote Code Execution Vulnerability

Original Issue Date:September 03, 2026

Severity Rating: CRITICAL

Systems Affected

  • N9324C-SE1U
  • N9348Y2C6D-SE1U
  • N9364E-SG2-O
  • N9364E-SG2-Q
  • N9396T12C-SE1
  • N9348Y12C-SE1
  • N9396Y12C-SE1
  • N9336C-SE1
  • N9K-C9804
  • N9K-C9808

Overview

A vulnerability has been reported in the Silicon One integration for Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to remote attacker to execute code with root privileges.

Target Audience: 
All IT administrators and individuals responsible for maintaining and updating in Software.

Risk Assessment:
High risk of data manipulation and service disruption.

Impact Assessment:
Potential impact on confidentiality, integrity, and availability of the system.

Description

This vulnerability exists due to TCP ports 43210 and 43211 are accessible in the default Layer 3 (L3) virtual routing and forwarding (VRF). An attacker could exploit this vulnerability by sending crafted input that could be executed as code with root privileges.

Successful exploitation of this vulnerability could allow the attacker the S1HAL process to crash, which could cause the device to reload.

Solution

Apply appropriate updates as mentioned in Cisco Advisory
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9k-s1-rce-EH8dEtr

Vendor Information

CISCO
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9k-s1-rce-EH8dEtr

References

CISCO
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9k-s1-rce-EH8dEtr

CVE Name
CVE-2026-20212

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-22902657

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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