VulnerabilityModified

CVE-2019-1804

CRITICAL 9.8EPSS 3.45%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (3.45%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public 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.

CVSS 3.1: 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 3.45% probability · 89th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-310, CWE-1188
Affected: cisco/nexus 9332pq firmware · cisco/nexus 93180yc-ex firmware · cisco/nexus 93128tx firmware · cisco/nexus 93120tx firmware · cisco/nexus 93108tc-ex firmware · cisco/nexus 9516 firmware · cisco/nexus 9508 firmware · cisco/nexus 9504 firmware · cisco/nexus 9500 firmware · cisco/nexus 9396tx firmware · cisco/nexus 9396px firmware · cisco/nexus 9372tx firmware · cisco/nexus 9372px firmware
Source: psirt@cisco.com

EPSS trend

EPSS 3.5% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.