CVE-2019-1804 | Cisco Nexus 9000 Series Fabric Switches Application Centric Infrastructure Mode Default SSH Key Vulnerability

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.

Published: 2019-05-03 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-1804 is rated High Risk (70/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 3.48%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-1804

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-28 3.39% 3.48% +0.09%
2 2026-06-15 2.77% 3.39% +0.61%
3 2026-06-13 — 2.77% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-1804

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-2019-1804

Affected software / configurations for CVE-2019-1804

Vendor Product Version Raw CPE
cisco nexus_9332pq_firmware 14.0\(3d\) cpe:2.3:o:cisco:nexus_9332pq_firmware:14.0\(3d\):*:*:*:*:*:*:*
cisco nexus_93180yc-ex_firmware 14.0\(3d\) cpe:2.3:o:cisco:nexus_93180yc-ex_firmware:14.0\(3d\):*:*:*:*:*:*:*
cisco nexus_93128tx_firmware 14.0\(3d\) cpe:2.3:o:cisco:nexus_93128tx_firmware:14.0\(3d\):*:*:*:*:*:*:*
cisco nexus_93120tx_firmware 14.0\(3d\) cpe:2.3:o:cisco:nexus_93120tx_firmware:14.0\(3d\):*:*:*:*:*:*:*
cisco nexus_93108tc-ex_firmware 14.0\(3d\) cpe:2.3:o:cisco:nexus_93108tc-ex_firmware:14.0\(3d\):*:*:*:*:*:*:*
cisco nexus_9516_firmware 14.0\(3d\) cpe:2.3:o:cisco:nexus_9516_firmware:14.0\(3d\):*:*:*:*:*:*:*
cisco nexus_9508_firmware 14.0\(3d\) cpe:2.3:o:cisco:nexus_9508_firmware:14.0\(3d\):*:*:*:*:*:*:*
cisco nexus_9504_firmware 14.0\(3d\) cpe:2.3:o:cisco:nexus_9504_firmware:14.0\(3d\):*:*:*:*:*:*:*
cisco nexus_9500_firmware 14.0\(3d\) cpe:2.3:o:cisco:nexus_9500_firmware:14.0\(3d\):*:*:*:*:*:*:*
cisco nexus_9396tx_firmware 14.0\(3d\) cpe:2.3:o:cisco:nexus_9396tx_firmware:14.0\(3d\):*:*:*:*:*:*:*
cisco nexus_9396px_firmware 14.0\(3d\) cpe:2.3:o:cisco:nexus_9396px_firmware:14.0\(3d\):*:*:*:*:*:*:*
cisco nexus_9372tx_firmware 14.0\(3d\) cpe:2.3:o:cisco:nexus_9372tx_firmware:14.0\(3d\):*:*:*:*:*:*:*
cisco nexus_9372px_firmware 14.0\(3d\) cpe:2.3:o:cisco:nexus_9372px_firmware:14.0\(3d\):*:*:*:*:*:*:*

References for CVE-2019-1804

cvelogic Threat Intelligence