Cisco Nexus 3000 and 9000 Series Switches VXLAN OAM (NGOAM) Remote Code Execution Vulnerability
Summary
| CVE | CVE-2026-76486 |
|---|---|
| State | PUBLISHED |
| Assigner | cisco |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-07 17:17:01 UTC |
| Updated | 2026-10-08 20:08:45 UTC |
| Description | A vulnerability in the VXLAN Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software, known as NGOAM, could allow an unauthenticated, remote attacker to execute arbitrary code with root privileges or cause a Denial-of-Service (DoS) on an affected device. This vulnerability is due to improper input validation of IP traffic when the NGOAM feature is enabled. An attacker could exploit this vulnerability 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 resulting in a reload and DoS condition. |
Risk And Classification
Primary CVSS: v3.1 9.8 CRITICAL from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.005090000 probability, percentile 0.416370000 (date 2026-10-09)
Problem Types: CWE-121 | CWE-121 Stack-based Buffer Overflow
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | CVSSV3_1 | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(3) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(4) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(5) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(6) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(5w) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(7) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(7k) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(7a) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(8) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(9) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(10) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(1) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(2) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(11) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(3) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(12) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.4(1) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(99w) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(3w) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(99x) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(3o) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(4) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(3p) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(4a) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.4(2) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(3q) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(13) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(5) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.4(3) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(3x) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(4g) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.5(1) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(3r) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(6) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(14) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.4(4) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(4h) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.5(2) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(7) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.4(5) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.5(3) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(15) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.4(4g) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.5(4) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.6(1) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.5(3t) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(8) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.4(6) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.5(3s) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.5(3e) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.5(3o) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(16) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.6(1s) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.6(2) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.5(3p) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.3(9) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.6(2s) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.6(3) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.4(7) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.5(5) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 9.3(17) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.6(2n) | Not specified |
| CNA | Cisco | Cisco NX-OS Software | affected 10.6(3s) | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ngoam-... | [email protected] | sec.cloudapps.cisco.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
Exploits
CNA: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
There are currently no legacy QID mappings associated with this CVE.