Vulnerability Intelligence Report
Cisco Nexus 3000 and 9000 Series Switches VXLAN OAM (NGOAM) Remote Code Execution Vulnerability
CVE-2026-76486
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.
No Active Exploit Signals
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-121 ↗Stack-based Buffer Overflow
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Cisco | Cisco NX-OS Software | 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) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Cisco Systems, Inc. · Hosted Service · USA |
| Reserved | 2026-08-19T12:02:03 |
| Published | 2026-10-07T16:17:16 |
| Last Updated | 2026-10-08T03:55:36 |
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