Cisco Nexus 3000 and 9000 Series Switches NGOAM Remote Code Execution Vulnerabilities

Description

Multiple vulnerabilities in the Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software, known as Next Generation OAM (NGOAM), 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. These vulnerabilities are due to improper input validation of IP traffic when NGOAM is enabled. An attacker could exploit these vulnerabilities by sending crafted packets to an IP interface on 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. Note: Feature requirements vary for each vulnerability. For details, see the Vulnerable Products section of this advisory. Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ngoam-rce-LWKQ4BU 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 . Security Impact Rating: Critical CVE: CVE-2026-76485,CVE-2026-76486,CVE-2026-76501

What to do

Install the fixed versions listed in the official advisory. If you cannot update right away, apply the workarounds or mitigations it describes and limit access to the affected service.

Details

Vendor

Cisco

Product

Cisco NX-OS

CVE

CVE-2026-76485, CVE-2026-76486, CVE-2026-76501

Affected versions

Cisco NX-OS Software 9.2: 7 versions, from 9.2(3) to 9.2(2)
Cisco NX-OS Software 9.3: 21 versions, from 9.3(2) to 9.3(17)
Cisco NX-OS Software 10.3: 20 versions, from 10.3(1) to 10.3(9)
Cisco NX-OS Software 10.4: 8 versions, from 10.4(1) to 10.4(7)
Cisco NX-OS Software 10.5: 10 versions, from 10.5(1) to 10.5(5)
Cisco NX-OS Software 10.6: 7 versions, from 10.6(1) to 10.6(3s) (from the advisory and NVD; check the exact builds in the official advisory)

CVSS score

9.8

Actively exploited

Not known at this time

Source

Cisco PSIRT – original advisory

Published

October 7, 2026

The description and the recommended action are quoted from the public advisory (the action is our generic advice); severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.