CVE-2019-1890

Cisco Nexus 9000 Series Fabric Switches ACI Mode Fabric Infrastructure VLAN Unauthorized Access Vulnerability

MEDIUM

6.5

CVSS Score

Published: July 4, 2019 at 08:00 PM UTC

Updated: June 17, 2026 at 02:29 AM UTC

34 products affected across 1 vendorApplication Policy Infrastructure ControllerNexus 93120TxNexus 93108Tc-Ex

Using Cisco NX-OS System Software in ACI Mode 11.0.1b by Cisco?

Get instant alerts when new vulnerabilities affect Cisco NX-OS System Software in ACI Mode 11.0.1b - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

MEDIUM6.5

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

Description

A vulnerability in the fabric infrastructure VLAN connection establishment of the Cisco Nexus 9000 Series Application Centric Infrastructure (ACI) Mode Switch Software could allow an unauthenticated, adjacent attacker to bypass security validations and connect an unauthorized server to the infrastructure VLAN. The vulnerability is due to insufficient security requirements during the Link Layer Discovery Protocol (LLDP) setup phase of the infrastructure VLAN. An attacker could exploit this vulnerability by sending a malicious LLDP packet on the adjacent subnet to the Cisco Nexus 9000 Series Switch in ACI mode. A successful exploit could allow the attacker to connect an unauthorized server to the infrastructure VLAN, which is highly privileged. With a connection to the infrastructure VLAN, the attacker can make unauthorized connections to Cisco Application Policy Infrastructure Controller (APIC) services or join other host endpoints.

Affected

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

Application Policy Infrastructure Controller · Cisco

95%

v < 14.1(2g)7.3(0)zn(0.113)

Affected range stops below 14.1(2g), so it looks safe — our inference, not a vendor statement

cisco-9432pq (environment) · cisco-9536pq (environment) · cisco-9636pq (environment) · cisco-9736pq (environment) · cisco-n9k-x9432c-s (environment) · cisco-n9k-x9464px (environment) · cisco-n9k-x9464tx2 (environment) · cisco-n9k-x9564px (environment) · cisco-n9k-x9564tx (environment) · cisco-n9k-x9636c-r (environment) · cisco-n9k-x9636c-rx (environment) · cisco-n9k-x97160yc-ex (environment) · cisco-n9k-x9732c-ex (environment) · cisco-n9k-x9732c-fx (environment) · cisco-n9k-x9736c-ex (environment) · cisco-n9k-x9736c-fx (environment) · cisco-n9k-x9788tc-fx (environment) · cisco-nexus-92160yc-x (environment) · cisco-nexus-93108tc-ex (environment) · cisco-nexus-93108tc-fx (environment) · cisco-nexus-93120tx (environment) · cisco-nexus-9316d-gx (environment) · cisco-nexus-93180yc-ex (environment) · cisco-nexus-93180yc-fx (environment) · cisco-nexus-93216tc-fx2 (environment) · cisco-nexus-93240yc-fx2 (environment) · cisco-nexus-9332c (environment) · cisco-nexus-93360yc-fx2 (environment) · cisco-nexus-9336c-fx2 (environment) · cisco-nexus-9348gc-fxp (environment) · cisco-nexus-93600cd-gx (environment) · cisco-nexus-9364c (environment) · cisco-x9636q-r (environment)

9432Pq · Ciscodevice

80%

All versions

9536Pq · Ciscodevice

80%

All versions

9636Pq · Ciscodevice

80%

All versions

9736Pq · Ciscodevice

80%

All versions