CVE-2026-76485 Cisco CVE debrief

Who should care

Network administrators and security teams responsible for Cisco Nexus 3000 and 9000 Series Switches should assess exposure and apply patches or mitigations as necessary. They should also review network configurations and device settings to ensure that all affected devices are properly patched and up-to-date.

Why it matters

This vulnerability in Cisco NX-OS Software's NGOAM feature allows unauthenticated remote attackers to potentially execute arbitrary code or cause a DoS. Network administrators and security teams should assess exposure, especially if using affected versions, and apply patches or mitigations.

• Potential for remote code execution with root privileges
• Possible Denial-of-Service (DoS) condition
• Need for patch application or feature disablement
• Importance of monitoring network traffic for suspicious activity

Technical summary

The vulnerability is in the VXLAN Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software. An unauthenticated, remote attacker could exploit this by sending crafted packets to an IP interface, potentially leading to arbitrary code execution with root privileges or a Denial-of-Service (DoS). The vulnerability is due to improper input validation of IP traffic when the NGOAM feature is enabled. This could allow an attacker to execute arbitrary code with root privileges or cause a DoS condition on an affected device.

Defensive priority

High

Recommended defensive actions

• Review and apply patches from Cisco for affected NX-OS Software versions
• Disable NGOAM feature if not required
• Monitor network traffic for suspicious activity
• Verify affected device configurations
• Conduct a thorough review of network configurations and device settings
• Ensure all affected devices are properly patched and up-to-date
• Implement additional security measures to detect and prevent similar attacks

Evidence notes

The 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.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.