Posting Date: 2026/09/07

【Vulnerability Alert】Critical Security Vulnerability Found in Cisco Nexus 9000 Series Switches (CVE-2026-20212)

  • Subject: 【Vulnerability Alert】Critical Security Vulnerability Found in Cisco Nexus 9000 Series Switches (CVE-2026-20212)


  • Description:
    • Forwarded security alert TWCERTCC-200-202609-00000003 from Taiwan Computer Emergency Response Team/Coordination Center (TWCERT/CC).
    • Cisco has issued a security alert regarding a critical vulnerability in its Nexus 9000 Series Switches (CVE-2026-20212, CVSS: 9.8). A vulnerability in the Silicon One integration of Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to execute code with root privileges.
  • Affected Platforms:
    • N9324C-SE1U, N9348Y2C6D-SE1U, N9364E-SG2-O, N9364E-SG2-Q, N9396T12C-SE1, N9348Y12C-SE1, N9396Y12C-SE1, N9336C-SE1, N9K-C9804, N9K-C9808
  • Recommendations:
    • Apply patches according to the solutions released on the official website.
  • References:
    1. https://www.twcert.org.tw/tw/cp-169-11185-7d481-1.html

Computer and Communication Center
Network System Division