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9.8

Cisco Nexus switches may be hijacked or crash

CVE-2026-76485 · published 2 days ago
Summary

Cisco Nexus 3000 and 9000 series switches running NX‑OS can be tricked into running unwanted code or rebooting if the VXLAN OAM feature is turned on. An attacker can send specially crafted network packets to the device, gaining full control or causing it to stop working. Disable the VXLAN OAM feature or apply the vendor’s update to stop the risk.

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 9.2(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-2026-76485 · NVD
CVE-2026-76485 · MITRE
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