CVE-2026-76471 - Vulnerability Details

- Cisco NX-OS Software NX-API Remote Code Execution Vulnerability

Description

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.

Published: 2026-10-07

Score: 9.8 Critical

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

This vulnerability arises from insufficient input validation in the NX-API feature of Cisco NX-OS Software. An unauthenticated attacker can craft an HTTP request that overflows a buffer, allowing the execution of arbitrary code with root privileges. The severe impact includes full system compromise and the potential for device reloads, leading to a denial of service condition. The weakness corresponds to CWE-122, which denotes a classic heap or stack buffer overflow.

Affected Systems

Affected products include Cisco NX-OS Software on Cisco Unified Computing System (Managed) devices. Specific version information is not disclosed in the provided data, so all instances of the NX-API feature on Cisco NX-OS should be considered vulnerable until a vendor patch is applied. Organizations using any Cisco NX-OS implementations must verify whether their firmware includes a fix for this issue.

Risk and Exploitability

The CVSS score of 9.8 classifies this as critical, indicating a high likelihood of exploitation if the vulnerability is present. EPSS data is unavailable, so the probability of real-world exploitation cannot be quantified, but the absence of a KEV listing does not mitigate the critical nature of the flaw. The path to exploitation requires network access to the NX-API over HTTP and does not need authentication. Without remediation, an attacker can achieve uncontrolled code execution and potentially bring the device offline.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco NX-OS Software

unknown

Version	Status	Constraints
`9.2(3)`	affected	—
`9.2(2v)`	affected	—
`9.2(1)`	affected	—
`9.2(2t)`	affected	—
`9.2(3y)`	affected	—
`9.3(2)`	affected	—
`9.2(4)`	affected	—
`9.3(1)`	affected	—
`9.3(1z)`	affected	—
`9.2(2)`	affected	—
`9.3(3)`	affected	—
`9.3(4)`	affected	—
`9.3(5)`	affected	—
`9.3(6)`	affected	—
`9.3(5w)`	affected	—
`9.3(7)`	affected	—
`9.3(7k)`	affected	—
`9.3(7a)`	affected	—
`9.3(8)`	affected	—
`9.3(9)`	affected	—
`9.3(10)`	affected	—
`10.3(1)`	affected	—
`10.3(2)`	affected	—
`9.3(11)`	affected	—
`10.3(3)`	affected	—
`9.3(12)`	affected	—
`10.4(1)`	affected	—
`10.3(99w)`	affected	—
`10.3(3w)`	affected	—
`10.3(99x)`	affected	—
`10.3(3o)`	affected	—
`10.3(4)`	affected	—
`10.3(3p)`	affected	—
`10.3(4a)`	affected	—
`10.4(2)`	affected	—
`10.3(3q)`	affected	—
`9.3(13)`	affected	—
`10.3(5)`	affected	—
`10.4(3)`	affected	—
`10.3(3x)`	affected	—
`10.3(4g)`	affected	—
`10.5(1)`	affected	—
`10.3(3r)`	affected	—
`10.3(6)`	affected	—
`9.3(14)`	affected	—
`10.4(4)`	affected	—
`10.3(4h)`	affected	—
`10.5(2)`	affected	—
`10.3(7)`	affected	—
`10.4(5)`	affected	—
`10.5(3)`	affected	—
`9.3(15)`	affected	—
`10.4(4g)`	affected	—
`10.5(4)`	affected	—
`10.6(1)`	affected	—
`10.5(3t)`	affected	—
`10.3(8)`	affected	—
`10.4(6)`	affected	—
`10.5(3s)`	affected	—
`10.5(3e)`	affected	—
`10.5(3o)`	affected	—
`9.3(16)`	affected	—
`10.6(1s)`	affected	—
`10.6(2)`	affected	—
`10.5(3p)`	affected	—
`10.3(9)`	affected	—
`10.6(2s)`	affected	—
`10.6(3)`	affected	—
`10.4(7)`	affected	—
`10.5(5)`	affected	—
`9.3(17)`	affected	—
`10.6(2n)`	affected	—
`10.6(3s)`	affected	—

Cisco

Cisco Unified Computing System (Managed)

unknown

Version	Status	Constraints
`4.0(1a)`	affected	—
`4.1(1d)`	affected	—
`4.0(4f)`	affected	—
`4.0(4a)`	affected	—
`4.0(4e)`	affected	—
`4.0(4c)`	affected	—
`4.0(4h)`	affected	—
`4.1(1c)`	affected	—
`4.0(2a)`	affected	—
`4.1(1e)`	affected	—
`4.1(2a)`	affected	—
`4.0(2b)`	affected	—
`4.0(1b)`	affected	—
`4.0(4d)`	affected	—
`4.0(2e)`	affected	—
`4.1(1a)`	affected	—
`4.0(4g)`	affected	—
`4.0(1c)`	affected	—
`4.0(1d)`	affected	—
`4.0(4b)`	affected	—
`4.0(4i)`	affected	—
`4.0(2d)`	affected	—
`4.1(1b)`	affected	—
`4.1(2b)`	affected	—
`4.0(4k)`	affected	—
`4.1(3a)`	affected	—
`4.1(3b)`	affected	—
`4.1(2c)`	affected	—
`4.0(4l)`	affected	—
`4.1(4a)`	affected	—
`4.1(3c)`	affected	—
`4.1(3d)`	affected	—
`4.2(1c)`	affected	—
`4.2(1d)`	affected	—
`4.0(4m)`	affected	—
`4.1(3e)`	affected	—
`4.2(1f)`	affected	—
`4.1(3f)`	affected	—
`4.2(1i)`	affected	—
`4.1(3h)`	affected	—
`4.2(1k)`	affected	—
`4.2(1l)`	affected	—
`4.0(4n)`	affected	—
`4.2(1m)`	affected	—
`4.1(3i)`	affected	—
`4.2(2a)`	affected	—
`4.2(1n)`	affected	—
`4.1(3j)`	affected	—
`4.2(2c)`	affected	—
`4.2(2d)`	affected	—
`4.2(3b)`	affected	—
`4.1(3k)`	affected	—
`4.0(4o)`	affected	—
`4.2(2e)`	affected	—
`4.2(3d)`	affected	—
`4.2(3e)`	affected	—
`4.2(3g)`	affected	—
`4.1(3l)`	affected	—
`4.3(2b)`	affected	—
`4.2(3h)`	affected	—
`4.2(3i)`	affected	—
`4.3(2c)`	affected	—
`4.1(3m)`	affected	—
`4.3(2e)`	affected	—
`4.3(3a)`	affected	—
`4.2(3j)`	affected	—
`4.3(3c)`	affected	—
`4.3(4a)`	affected	—
`4.2(3k)`	affected	—
`4.3(4b)`	affected	—
`4.3(4c)`	affected	—
`4.2(3l)`	affected	—
`4.3(4d)`	affected	—
`4.3(2f)`	affected	—
`4.2(3m)`	affected	—
`4.3(5a)`	affected	—
`4.3(4e)`	affected	—
`4.1(3n)`	affected	—
`4.3(4f)`	affected	—
`4.2(3n)`	affected	—
`4.3(5c)`	affected	—
`4.2(3o)`	affected	—
`4.3(5d)`	affected	—
`4.3(6a)`	affected	—
`4.3(6b)`	affected	—
`4.3(5e)`	affected	—
`4.3(6c)`	affected	—
`4.2(3p)`	affected	—
`4.3(6d)`	affected	—
`4.3(6e)`	affected	—
`4.3(6f)`	affected	—
`4.2(3r)`	affected	—
`4.3(6g)`	affected	—
`4.3(6h)`	affected	—
`4.2(3s)`	affected	—
`4.3(6i)`	affected	—

No data.

Vendor Product Confidence Versions

Cisco

Nx-os Software

87%

Version	Status	Scheme	Platform
`9.2(3)`	affected	generic	—
`9.2(2v)`	affected	generic	—
`9.2(1)`	affected	generic	—
`9.2(2t)`	affected	generic	—
`9.2(3y)`	affected	generic	—
`9.3(2)`	affected	generic	—
`9.2(4)`	affected	generic	—
`9.3(1)`	affected	generic	—
`9.3(1z)`	affected	generic	—
`9.2(2)`	affected	generic	—
`9.3(3)`	affected	generic	—
`9.3(4)`	affected	generic	—
`9.3(5)`	affected	generic	—
`9.3(6)`	affected	generic	—
`9.3(5w)`	affected	generic	—
`9.3(7)`	affected	generic	—
`9.3(7k)`	affected	generic	—
`9.3(7a)`	affected	generic	—
`9.3(8)`	affected	generic	—
`9.3(9)`	affected	generic	—
`9.3(10)`	affected	generic	—
`10.3(1)`	affected	generic	—
`10.3(2)`	affected	generic	—
`9.3(11)`	affected	generic	—
`10.3(3)`	affected	generic	—
`9.3(12)`	affected	generic	—
`10.4(1)`	affected	generic	—
`10.3(99w)`	affected	generic	—
`10.3(3w)`	affected	generic	—
`10.3(99x)`	affected	generic	—
`10.3(3o)`	affected	generic	—
`10.3(4)`	affected	generic	—
`10.3(3p)`	affected	generic	—
`10.3(4a)`	affected	generic	—
`10.4(2)`	affected	generic	—
`10.3(3q)`	affected	generic	—
`9.3(13)`	affected	generic	—
`10.3(5)`	affected	generic	—
`10.4(3)`	affected	generic	—
`10.3(3x)`	affected	generic	—
`10.3(4g)`	affected	generic	—
`10.5(1)`	affected	generic	—
`10.3(3r)`	affected	generic	—
`10.3(6)`	affected	generic	—
`9.3(14)`	affected	generic	—
`10.4(4)`	affected	generic	—
`10.3(4h)`	affected	generic	—
`10.5(2)`	affected	generic	—
`10.3(7)`	affected	generic	—
`10.4(5)`	affected	generic	—
`10.5(3)`	affected	generic	—
`9.3(15)`	affected	generic	—
`10.4(4g)`	affected	generic	—
`10.5(4)`	affected	generic	—
`10.6(1)`	affected	generic	—
`10.5(3t)`	affected	generic	—
`10.3(8)`	affected	generic	—
`10.4(6)`	affected	generic	—
`10.5(3s)`	affected	generic	—
`10.5(3e)`	affected	generic	—
`10.5(3o)`	affected	generic	—
`9.3(16)`	affected	generic	—
`10.6(1s)`	affected	generic	—
`10.6(2)`	affected	generic	—
`10.5(3p)`	affected	generic	—
`10.3(9)`	affected	generic	—
`10.6(2s)`	affected	generic	—
`10.6(3)`	affected	generic	—
`10.4(7)`	affected	generic	—
`10.5(5)`	affected	generic	—
`9.3(17)`	affected	generic	—
`10.6(2n)`	affected	generic	—
`10.6(3s)`	affected	generic	—

Cisco

Unified Computing System Manager

89%

Version	Status	Scheme	Platform
`4.0(1a)`	affected	generic	—
`4.1(1d)`	affected	generic	—
`4.0(4f)`	affected	generic	—
`4.0(4a)`	affected	generic	—
`4.0(4e)`	affected	generic	—
`4.0(4c)`	affected	generic	—
`4.0(4h)`	affected	generic	—
`4.1(1c)`	affected	generic	—
`4.0(2a)`	affected	generic	—
`4.1(1e)`	affected	generic	—
`4.1(2a)`	affected	generic	—
`4.0(2b)`	affected	generic	—
`4.0(1b)`	affected	generic	—
`4.0(4d)`	affected	generic	—
`4.0(2e)`	affected	generic	—
`4.1(1a)`	affected	generic	—
`4.0(4g)`	affected	generic	—
`4.0(1c)`	affected	generic	—
`4.0(1d)`	affected	generic	—
`4.0(4b)`	affected	generic	—
`4.0(4i)`	affected	generic	—
`4.0(2d)`	affected	generic	—
`4.1(1b)`	affected	generic	—
`4.1(2b)`	affected	generic	—
`4.0(4k)`	affected	generic	—
`4.1(3a)`	affected	generic	—
`4.1(3b)`	affected	generic	—
`4.1(2c)`	affected	generic	—
`4.0(4l)`	affected	generic	—
`4.1(4a)`	affected	generic	—
`4.1(3c)`	affected	generic	—
`4.1(3d)`	affected	generic	—
`4.2(1c)`	affected	generic	—
`4.2(1d)`	affected	generic	—
`4.0(4m)`	affected	generic	—
`4.1(3e)`	affected	generic	—
`4.2(1f)`	affected	generic	—
`4.1(3f)`	affected	generic	—
`4.2(1i)`	affected	generic	—
`4.1(3h)`	affected	generic	—
`4.2(1k)`	affected	generic	—
`4.2(1l)`	affected	generic	—
`4.0(4n)`	affected	generic	—
`4.2(1m)`	affected	generic	—
`4.1(3i)`	affected	generic	—
`4.2(2a)`	affected	generic	—
`4.2(1n)`	affected	generic	—
`4.1(3j)`	affected	generic	—
`4.2(2c)`	affected	generic	—
`4.2(2d)`	affected	generic	—
`4.2(3b)`	affected	generic	—
`4.1(3k)`	affected	generic	—
`4.0(4o)`	affected	generic	—
`4.2(2e)`	affected	generic	—
`4.2(3d)`	affected	generic	—
`4.2(3e)`	affected	generic	—
`4.2(3g)`	affected	generic	—
`4.1(3l)`	affected	generic	—
`4.3(2b)`	affected	generic	—
`4.2(3h)`	affected	generic	—
`4.2(3i)`	affected	generic	—
`4.3(2c)`	affected	generic	—
`4.1(3m)`	affected	generic	—
`4.3(2e)`	affected	generic	—
`4.3(3a)`	affected	generic	—
`4.2(3j)`	affected	generic	—
`4.3(3c)`	affected	generic	—
`4.3(4a)`	affected	generic	—
`4.2(3k)`	affected	generic	—
`4.3(4b)`	affected	generic	—
`4.3(4c)`	affected	generic	—
`4.2(3l)`	affected	generic	—
`4.3(4d)`	affected	generic	—
`4.3(2f)`	affected	generic	—
`4.2(3m)`	affected	generic	—
`4.3(5a)`	affected	generic	—
`4.3(4e)`	affected	generic	—
`4.1(3n)`	affected	generic	—
`4.3(4f)`	affected	generic	—
`4.2(3n)`	affected	generic	—
`4.3(5c)`	affected	generic	—
`4.2(3o)`	affected	generic	—
`4.3(5d)`	affected	generic	—
`4.3(6a)`	affected	generic	—
`4.3(6b)`	affected	generic	—
`4.3(5e)`	affected	generic	—
`4.3(6c)`	affected	generic	—
`4.2(3p)`	affected	generic	—
`4.3(6d)`	affected	generic	—
`4.3(6e)`	affected	generic	—
`4.3(6f)`	affected	generic	—
`4.2(3r)`	affected	generic	—
`4.3(6g)`	affected	generic	—
`4.3(6h)`	affected	generic	—
`4.2(3s)`	affected	generic	—
`4.3(6i)`	affected	generic	—

Found an issue or want to improve our Enrichment? You can suggest it directly by opening an issue on our dedicated GitHub repository .

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Apply the latest Cisco NX-OS firmware update that includes a fix for the NX-API RCE vulnerability as soon as it is released.
If a patch cannot be applied immediately, disable the NX-API service or restrict access to the API by using firewall rules or ACLs to allow traffic only from trusted management IPs.
After disabling or patching, monitor device logs and network traffic for any anomalous NX-API requests or attempts to exploit the API.

Generated by OpenCVE AI on October 7, 2026 at 18:10 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00486.

Exploitation none

Automatable yes

Technical Impact total

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-napi-rce-r2shwu2j

History

Sun, 11 Oct 2026 12:30:00 +0000

Type	Values Removed	Values Added
First Time appeared		Cisco Cisco nx-os Software Cisco unified Computing System Manager
Vendors & Products		Cisco Cisco nx-os Software Cisco unified Computing System Manager

Wed, 07 Oct 2026 19:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Wed, 07 Oct 2026 16:30:00 +0000

Type	Values Removed	Values Added
Description		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.
Title		Cisco NX-OS Software NX-API Remote Code Execution Vulnerability
Weaknesses		CWE-122
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-napi-rce-r2shwu2j
Metrics		cvssV3_1 `{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}`

Subscriptions

Cisco Nx-os Software Unified Computing System Manager

MITRE

Status: PUBLISHED

Assigner: cisco

Published: 2026-10-07T16:15:35.076Z

Updated: 2026-10-08T03:55:32.792Z

Reserved: 2026-08-19T12:02:03.638Z

Link: CVE-2026-76471

Vulnrichment

Updated: 2026-10-07T17:46:08.443Z

NVD

Status : Awaiting Analysis

Published: 2026-10-07T17:17:00.230

Modified: 2026-10-08T20:08:45.857

Link: CVE-2026-76471

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-10-11T12:15:18Z

Weaknesses

CWE-122
Heap-based Buffer Overflow

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Exploitation none

Automatable yes

Technical Impact total

Subscriptions

JSON object

JSON object

JSON object

JSON object

JSON object