cisco-sa-moam-rce-uBTzYV7CriticalCVSS 9.8

Cisco Nexus 3000 and 9000 Series Switches MPLS OAM Remote Code Execution Vulnerability

Published
October 7, 2026
Last Modified
October 7, 2026

🔗 CVE IDs covered (1)

CVE-2026-76465 →

📋 Description

A vulnerability in the MPLS Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches 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.

This vulnerability is due to improper validation when an affected device is processing an MPLS echo-request packet. An attacker could exploit this vulnerability by sending a crafted MPLS echo-request to an IP address 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 device reload and a DoS condition.

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

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 ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-notice-fBn58ELx"]. For further documentation of improvements and fixes in Cisco NX-OS Software, see Cisco NX-OS Software Security Hardening Release: October 2026 ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-nxosw1-cWzSbtR"].

CVE-2026-76465 — Cisco Nexus 3000 and 9000 Series Switches MPLS OAM Remote Code Execution Vulnerability (CVSS 3.1 9.8, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

🎯 Affected products69

  • Cisco NX-OS Software
  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 9000 Series Switches
  • Cisco NX-OS Software 10.3(1)
  • Cisco NX-OS Software 10.3(2)
  • Cisco NX-OS Software 10.3(3)
  • Cisco NX-OS Software 10.3(3o)
  • Cisco NX-OS Software 10.3(3p)
  • Cisco NX-OS Software 10.3(3q)
  • Cisco NX-OS Software 10.3(3r)
  • Cisco NX-OS Software 10.3(3w)
  • Cisco NX-OS Software 10.3(3x)
  • Cisco NX-OS Software 10.3(4)
  • Cisco NX-OS Software 10.3(4a)
  • Cisco NX-OS Software 10.3(4g)
  • Cisco NX-OS Software 10.3(4h)
  • Cisco NX-OS Software 10.3(5)
  • Cisco NX-OS Software 10.3(6)
  • Cisco NX-OS Software 10.3(7)
  • Cisco NX-OS Software 10.3(8)
  • Cisco NX-OS Software 10.3(9)
  • Cisco NX-OS Software 10.3(99w)
  • Cisco NX-OS Software 10.3(99x)
  • Cisco NX-OS Software 10.4(1)
  • Cisco NX-OS Software 10.4(2)
  • Cisco NX-OS Software 10.4(3)
  • Cisco NX-OS Software 10.4(4)
  • Cisco NX-OS Software 10.4(4g)
  • Cisco NX-OS Software 10.4(5)
  • Cisco NX-OS Software 10.4(6)
  • +39 more not shown

✅ Remediation

Cisco has released software updates that address this vulnerability. https://software.cisco.com Workarounds: There are no workarounds that address this vulnerability. If the MPLS OAM feature is not required, disabling it removes the attack vector and is a mitigation for this vulnerability. To disable the MPLS OAM feature, use the Cisco NX-OS CLI command no feature mpls oam in global configuration mode on a Cisco Nexus 3000 or 9000 Series Switch. While this mitigation has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment. Live Protect Shield Cisco has released a Live Protect shield for CVE-2026-76465 ["https://software.cisco.com/download/products?swtypemdfid=286346710&relver=10.6(3)"] to temporarily mitigate this vulnerability for Cisco NX-OS Software. For information about Live Protect for Cisco NX-OS Software, see Cisco Nexus 9000 Series NX-OS Security Configuration Guide ["https://www.cisco.com/c/en/us/td/docs/dcn/nx-os/nexus9000/106x/configuration/security/cisco-nexus-9000-series-nx-os-security-configuration-guide-release-106x/m-secure-nx-os-with-live-protect.html"]. 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 ["#fs"] section of this advisory.

🔗 References (7)