CVE-2019-1804: Cisco Nexus 93108tc-Ex Firmware

Critical severity, CVSS 9.8. EPSS: 3.5% chance of exploitation in the next 30 days.

A vulnerability in the SSH key management for the Cisco Nexus 9000 Series Application Centric Infrastructure (ACI) Mode Switch Software could allow an unauthenticated, remote attacker to connect to the affected system with the privileges of the root user. The vulnerability is due to the presence of a default SSH key pair that is present in all devices. An attacker could exploit this vulnerability by opening an SSH connection via IPv6 to a targeted device using the extracted key materials. An exploit could allow the attacker to access the system with the privileges of the root user. This vulnerability is only exploitable over IPv6; IPv4 is not vulnerable.

Affected products

• Cisco Nexus 93108tc-Ex Firmware: version 14.0(3d) only
• Cisco Nexus 93120tx Firmware: version 14.0(3d) only
• Cisco Nexus 93128tx Firmware: version 14.0(3d) only
• Cisco Nexus 93180yc-Ex Firmware: version 14.0(3d) only
• Cisco Nexus 9332pq Firmware: version 14.0(3d) only
• Cisco Nexus 9372px Firmware: version 14.0(3d) only
• Cisco Nexus 9372tx Firmware: version 14.0(3d) only
• Cisco Nexus 9396px Firmware: version 14.0(3d) only
• Cisco Nexus 9396tx Firmware: version 14.0(3d) only
• Cisco Nexus 9500 Firmware: version 14.0(3d) only
• Cisco Nexus 9504 Firmware: version 14.0(3d) only
• Cisco Nexus 9508 Firmware: version 14.0(3d) only
• Cisco Nexus 9516 Firmware: version 14.0(3d) only

Published 2019-05-03. Last modified 2026-06-17.