Cisco Nexus 3000 and 9000 Series Switches Health Monitoring Diagnostics Denial of Service Vulnerability (CVE-2025-20111)
CVE number = CVE-2025-20111
A vulnerability in the health monitoring diagnostics of Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, adjacent attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.
This vulnerability is due to the incorrect handling of specific Ethernet frames. An attacker could exploit this vulnerability by sending a sustained rate of crafted Ethernet frames to an affected device. A successful exploit could allow the attacker to cause the device to reload.
This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco NX-OS Software, regardless of device configuration:
- Nexus 3100 Series Switches
- Nexus 3200 Series Switches
- Nexus 3400 Series Switches
- Nexus 3600 Series Switches
- Nexus 9200 Series Switches in standalone NX-OS mode
- Nexus 9300 Series Switches in standalone NX-OS mode
- Nexus 9400 Series Switches in standalone NX-OS mode
Cisco has released software updates that address this vulnerability (see link below)
There are workarounds that address this vulnerability.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n3kn9k-healthdos-eOqSWK4g
I am one of the editors here at www.systemtek.co.uk I am a UK based technology professional, with an interest in computer security and telecoms.