Cisco Security Advisory: Cisco NX-OS Software NX

A vulnerability in the NX-API feature of Cisco NX-OS Software could allow an unauthenticated, remote attacker to execute arbitrary code with root privileges or cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient input validation of data that is sent to the NX-API. An attacker could exploit this vulnerability by sending a crafted HTTP request to the NX-API of an affected device. A successful exploit could allow the attacker to execute arbitrary code with root privileges and could cause process crashes, which could result in a reload of the device and a DoS condition. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of October 7, 2026, Security Advisories . For further documentation of improvements and fixes in Cisco NX-OS Software, see Cisco NX-OS Software Security Hardening Release: October 2026 .

A vulnerability in the NX-API feature of Cisco NX-OS Software could allow an unauthenticated, remote attacker to execute arbitrary code with root privileges or cause a denial of service (DoS) condition on an affected device.

The vulnerability is due to insufficient input validation of data that is sent to the NX-API. An attacker could exploit this vulnerability by sending a crafted HTTP request to the NX-API of an affected device. A successful exploit could allow the attacker to execute arbitrary code with root privileges and could cause process crashes, which could result in a reload of the device and a DoS condition.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:

This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of October 7, 2026, Security Advisories . For further documentation of improvements and fixes in Cisco NX-OS Software, see Cisco NX-OS Software Security Hardening Release: October 2026 .

Vulnerable Products This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco NX-OS Software and have the NX-API feature enabled: Nexus 3000 Series Switches ( CSCwu46199 ) Nexus 9000 Series Switches in standalone NX-OS mode ( CSCwu46199 ) UCS 6300 Series Fabric Interconnects ( CSCwu58579 ) Note: The NX-API feature is disabled by default for Cisco Nexus 3000 and 9000 Series Switches. For Cisco UCS 6300 Series Fabric Interconnects, exploitation of the vulnerability requires valid low-privileged user credentials and occurs through the Cisco UCS Manager XML API, which is enabled by default and cannot be disabled without loss of functionality. Due to this authentication requirement, the Security Impact Rating (SIR) of this vulnerability is reduced to High for Cisco UCS 6300 Series Fabric Interconnects. For information which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. Determine the Status of NX-API To determine whether a Cisco Nexus 3000 or 9000 Series Switch is configured with the NX-API feature enabled, use the show feature | include nxapi command from the Cisco NX-OS CLI. The following example shows output from a switch that has the NX-API feature enabled: switch# show feature | include nxapi nxapi 1 enabled Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Cisco has confirmed that this vulnerability does not affect the following Cisco products: Firepower 1000 Series Firepower 2100 Series Firepower 4100 Series Firepower 9300 Security Appliances MDS 9000 Series Multilayer Switches Nexus 7000 Series Switches Nexus 9000 Series Fabric Switches in ACI mode Secure Firewall 200 Series Secure Firewall 1200 Series Secure Firewall 3100 Series Secure Firewall 4200 Series Secure Firewall 6100 Series UCS 6400 Series Fabric Interconnects UCS 6500 Series Fabric Interconnects UCS 6600 Series Fabric Interconnects UCS X-Series Direct Fabric Interconnect 9108 100G

This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco NX-OS Software and have the NX-API feature enabled:

Nexus 3000 Series Switches ( CSCwu46199 )

Nexus 9000 Series Switches in standalone NX-OS mode ( CSCwu46199 )

UCS 6300 Series Fabric Interconnects ( CSCwu58579 )

Note: The NX-API feature is disabled by default for Cisco Nexus 3000 and 9000 Series Switches. For Cisco UCS 6300 Series Fabric Interconnects, exploitation of the vulnerability requires valid low-privileged user credentials and occurs through the Cisco UCS Manager XML API, which is enabled by default and cannot be disabled without loss of functionality. Due to this authentication requirement, the Security Impact Rating (SIR) of this vulnerability is reduced to High for Cisco UCS 6300 Series Fabric Interconnects.

For information which Cisco software releases are vulnerable, see the Fixed Software section of this advisory.

Determine the Status of NX-API

To determine whether a Cisco Nexus 3000 or 9000 Series Switch is configured with the NX-API feature enabled, use the show feature | include nxapi command from the Cisco NX-OS CLI. The following example shows output from a switch that has the NX-API feature enabled:

switch# show feature | include nxapi nxapi 1 enabled

Products Confirmed Not Vulnerable

Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.

Cisco has confirmed that this vulnerability does not affect the following Cisco products:

Firepower 1000 Series

Firepower 2100 Series

Firepower 4100 Series

Firepower 9300 Security Appliances

MDS 9000 Series Multilayer Switches

Nexus 7000 Series Switches

Nexus 9000 Series Fabric Switches in ACI mode

Secure Firewall 200 Series

Secure Firewall 1200 Series

Secure Firewall 3100 Series

Secure Firewall 4200 Series

Secure Firewall 6100 Series

UCS 6400 Series Fabric Interconnects

UCS 6500 Series Fabric Interconnects

UCS 6600 Series Fabric Interconnects

UCS X-Series Direct Fabric Interconnect 9108 100G

There are no workarounds that address this vulnerability. Live Protect Shield Cisco has released a Live Protect shield for CVE-2026-76471 to temporarily mitigate this vulnerability for Cisco NX-OS Software. For information Live Protect for Cisco NX-OS Software, see Cisco Nexus 9000 Series NX-OS Security Configuration Guide . Note: Live Protect shields are temporary mitigations to bridge the gap until software updates can be scheduled. To remediate this vulnerability, upgrade to a fixed software release as noted in the Fixed Software section of this advisory.

There are no workarounds that address this vulnerability.

Cisco has released a Live Protect shield for CVE-2026-76471 to temporarily mitigate this vulnerability for Cisco NX-OS Software.

For information Live Protect for Cisco NX-OS Software, see Cisco Nexus 9000 Series NX-OS Security Configuration Guide .

Note: Live Protect shields are temporary mitigations to bridge the gap until software updates can be scheduled. To remediate this vulnerability, upgrade to a fixed software release as noted in the Fixed Software section of this advisory.

Cisco considers any workarounds and mitigations (if applicable) to be temporary solutions until an upgrade to a fixed software release is available. To remediate this vulnerability and avoid future exposure as described in this advisory, Cisco strongly recommends that customers upgrade to the fixed software indicated in this advisory. Cisco NX-OS Software To help customers determine their exposure to vulnerabilities in Cisco NX-OS Software, Cisco provides the Cisco Software Checker . This tool identifies any Cisco security advisories that impact a specific software release and the earliest release that fixes the vulnerabilities that are described in each advisory (“First Fixed”). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories that the Software Checker identifies (“Combined First Fixed”). To use the tool, go to the Cisco Software Checker page and follow the instructions. Alternatively, use the following form to for vulnerabilities that affect a specific software release. To use the form, follow these steps: Choose which advisories the tool will -only this advisory, only advisories with a Critical or High Security Impact Rating (SIR) , or all advisories. Choose the appropriate software. Choose the appropriate platform. Enter a release number-for example, 10.4(4) for Cisco Nexus 3000 Series Switches or 16.0(8e) for Cisco NX-OS Software in ACI mode. Click Check . Cisco UCS Software In the following table, the left column lists Cisco software releases. The center and right columns indicate whether a release is affected by the vulnerability described in this advisory and the first release that includes the fix for this vulnerability. UCS 6300 Series Fabric Interconnect Cisco UCS Software Release First Fixed Release for UCS Manager Managed Mode First Fixed Release for UCS Intersight Managed Mode 4.2 and earlier Migrate to a fixed release. Migrate to a fixed release. 4.3 4.3(6j) 4.3(6.260049) The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.

Cisco considers any workarounds and mitigations (if applicable) to be temporary solutions until an upgrade to a fixed software release is available. To remediate this vulnerability and avoid future exposure as described in this advisory, Cisco strongly recommends that customers upgrade to the fixed software indicated in this advisory.

To help customers determine their exposure to vulnerabilities in Cisco NX-OS Software, Cisco provides the Cisco Software Checker . This tool identifies any Cisco security advisories that impact a specific software release and the earliest release that fixes the vulnerabilities that are described in each advisory (“First Fixed”). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories that the Software Checker identifies (“Combined First Fixed”).

To use the tool, go to the Cisco Software Checker page and follow the instructions. Alternatively, use the following form to for vulnerabilities that affect a specific software release. To use the form, follow these steps:

Choose which advisories the tool will -only this advisory, only advisories with a Critical or High Security Impact Rating (SIR) , or all advisories.

Choose the appropriate software.

Choose the appropriate platform.

Enter a release number-for example, 10.4(4) for Cisco Nexus 3000 Series Switches or 16.0(8e) for Cisco NX-OS Software in ACI mode.

In the following table, the left column lists Cisco software releases. The center and right columns indicate whether a release is affected by the vulnerability described in this advisory and the first release that includes the fix for this vulnerability.

UCS 6300 Series Fabric Interconnect

The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.

Exploitation and Public Announcements

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

This vulnerability was found during internal security testing.

This vulnerability was found during internal security testing.

Cisco Security Vulnerability Policy

To learn Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy . This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco. For additional information on Cisco's vulnerability management, disclosure cadence, and software patching strategy, see Cisco's Transition to a Risk-Based Vulnerability Disclosure Model .

To learn Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy . This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.

For additional information on Cisco's vulnerability management, disclosure cadence, and software patching strategy, see Cisco's Transition to a Risk-Based Vulnerability Disclosure Model .

Related to This Advisory

Version Description Section Status Date 1.0 Initial public release. - Final 2026-OCT-07 Show Less

SOFTWARE DOWNLOADS AND TECHNICAL SUPPORT The Cisco Support and Downloads page on Cisco.com provides information licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool. Please note that customers may download only software that was procured from Cisco directly or through a Cisco authorized reseller or partner and for which the license is still valid. Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC) . Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. When considering software upgrades , customers are advised to regularly consult the advisories for the relevant Cisco products to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. LEGAL DISCLAIMER DETAILS CISCO DOES NOT MAKE ANY EXPRESS OR IMPLIED GUARANTEES OR WARRANTIES OF ANY KIND, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, CISCO DOES NOT GUARANTEE THE ACCURACY OR COMPLETENESS OF THIS INFORMATION. THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME. Copies or summaries of the information contained in this Security Advisory may lack important information or contain factual errors. Customers are advised to visit the Cisco Security Advisories page for the most recent version of this Security Advisory. The Cisco Product Security Incident Response Team (PSIRT) assesses only the affected and fixed release information that is documented in this advisory. See the Cisco Security Vulnerability Policy for more information.

SOFTWARE DOWNLOADS AND TECHNICAL SUPPORT

The Cisco Support and Downloads page on Cisco.com provides information licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool. Please note that customers may download only software that was procured from Cisco directly or through a Cisco authorized reseller or partner and for which the license is still valid.

Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC) . Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.

When considering software upgrades , customers are advised to regularly consult the advisories for the relevant Cisco products to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

LEGAL DISCLAIMER DETAILS

CISCO DOES NOT MAKE ANY EXPRESS OR IMPLIED GUARANTEES OR WARRANTIES OF ANY KIND, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, CISCO DOES NOT GUARANTEE THE ACCURACY OR COMPLETENESS OF THIS INFORMATION. THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

Copies or summaries of the information contained in this Security Advisory may lack important information or contain factual errors. Customers are advised to visit the Cisco Security Advisories page for the most recent version of this Security Advisory. The Cisco Product Security Incident Response Team (PSIRT) assesses only the affected and fixed release information that is documented in this advisory. See the Cisco Security Vulnerability Policy for more information.

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