CVE-2019-1804

Cisco Nexus 9000 Series Fabric Switches Application Centric Infrastructure Mode Default SSH Key Vulnerability

CRITICAL
9.8
CVSS Score
Published: May 3, 2019 at 04:25 PM UTC
Updated: June 17, 2026 at 02:29 AM UTC
27 products affected across 1 vendorNexus 93120TX FirmwareNexus 9504 FirmwareNexus 9508 Firmware

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Severity
CRITICAL9.8
Exploit prediction
EPSS 3%
SSVC
No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

cisco-nexus-93108tc-ex (same device)
cisco-nexus-93120tx (same device)
cisco-nexus-93128tx (same device)
cisco-nexus-93180yc-ex (same device)
cisco-nexus-9332pq (same device)
cisco-nexus-9372px (same device)
cisco-nexus-9372tx (same device)
cisco-nexus-9396px (same device)
cisco-nexus-9396tx (same device)
cisco-nexus-9500 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-310CWE-1188

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