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9.8

Cisco Nexus switches can be taken over via VXLAN OAM

CVE-2026-76486 · published 2 days ago
Summary

Cisco NX‑OS devices that run the VXLAN OAM feature can be tricked into running malicious code or crashing, giving an outside attacker full control or causing the switch to stop working. The problem occurs when specially crafted network packets are sent to the device. Disable the VXLAN OAM feature or apply the latest Cisco software update to protect your switches.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
cisco cisco nx-os software 9.3(3)
Original advisory text
Cisco Nexus 3000 and 9000 Series Switches VXLAN OAM (NGOAM) Remote Code Execution Vulnerability
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.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
9.8 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-121Stack-based Buffer Overflow
Timeline
Published7 Oct 2026
Updated8 Oct 2026
First seen7 Oct 2026
Sources
CVE-2026-76486 · NVD
CVE-2026-76486 · MITRE
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