CVE-2026-76465 Cisco CVE debrief

Who should care

Network administrators, cybersecurity teams, and IT professionals responsible for managing and securing Cisco Nexus 3000 and 9000 Series Switches should be aware of this vulnerability and take immediate action to patch or mitigate affected systems.

Why it matters

This critical vulnerability in Cisco Nexus 3000 and 9000 Series Switches requires immediate attention from network administrators and cybersecurity teams to prevent potential remote code execution and denial of service conditions. Affected systems should be patched or mitigated as soon as possible, and thorough inventory checks and compensating controls should be implemented.

• Potential for unauthenticated remote code execution with root privileges
• Possible denial of service condition leading to device reloads
• Need for immediate patching and verification of affected systems
• Potential for exploitation requires verification from official sources

Technical summary

The vulnerability exists in the MPLS Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches. An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted MPLS echo-request packet to an IP address on an affected device, potentially leading to arbitrary code execution with root privileges or a denial of service condition.

Defensive priority

High priority for immediate patching and verification of affected systems

Recommended defensive actions

• Immediately patch affected Cisco Nexus 3000 and 9000 Series Switches with the latest NX-OS Software version
• Verify and apply Cisco's official security advisory guidance
• Conduct thorough inventory checks to identify and prioritize affected systems
• Implement compensating controls, such as network segmentation or access restrictions, if patching is not immediately feasible
• Review relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability is confirmed in multiple versions of Cisco NX-OS Software running on Cisco Nexus 3000 and 9000 Series Switches. Official sources, including Cisco and the CVE Program, confirm the vulnerability and provide details on affected versions.

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.