CVE-2013-1213: Cisco NX-OS on the Nexus 1000V does not assign the proper priority to heartbeat messages from a Virtual Eth...

Security readout for executives and security teams

This issue affects Cisco NX-OS on Nexus 1000V. A flood of UDP traffic can interfere with VEM-to-VSM heartbeat handling, making a VEM appear unavailable. The documented impact is denial of service through a false unavailability report, not data theft or code execution. Exposure is limited to environments running Cisco Nexus 1000V with the VSM/VEM architecture described in the CVE. The bundle does not provide affected versions, CVSS, CPEs, or confirmed vulnerable release ranges. Treat as environment-dependent. It is most important where Nexus 1000V still supports critical virtual networking. Without confirmed deployment, known exploitation, or CVSS data, broad emergency action is not supported by the provided evidence. Mitigation focus: Check Cisco advisory guidance for affected releases and fixed software availability.; Limit untrusted UDP traffic reaching Nexus 1000V control-plane or management paths.; Review whether Nexus 1000V remains deployed in production virtualization environments..

Prepared

Jun 14, 2026, 22:07 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.