Cisco NX-OS Software/Unified Computing System NX-API input validation

Summaryinfo

A vulnerability was found in Cisco NX-OS Software and Unified Computing System. It has been declared as very critical. The impacted element is an unknown function of the component NX-API. The manipulation results in input validation. This vulnerability is reported as CVE-2026-76471. The attack can be launched remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Cisco NX-OS Software and Unified Computing System (version now known). Affected is some unknown processing of the component NX-API. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at sec.cloudapps.cisco.com. This vulnerability is traded as CVE-2026-76471 since 08/19/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 10/07/2026).

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Virtualization Software

Vendor

• Cisco

Name

• NX-OS Software
• Unified Computing System

License

• commercial

Website

• Vendor: https://www.cisco.com/

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