Input validation error in Cisco Systems, Inc products - CVE-2025-20111

Vulnerability identifier: #VU105095

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-20111

CWE-ID: CWE-20

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to the incorrect handling of specific Ethernet frames in the health monitoring diagnostics. A remote attacker on the local network can send a sustained rate of crafted Ethernet frames and perform a denial of service (DoS) attack.

Nexus 9400 Series Switches in standalone NX-OS mode
Nexus 9300 Series Switches in standalone NX-OS mode
Nexus 9200 Series Switches in standalone NX-OS mode
Nexus 3600 Series Switches
Nexus 3400 Series Switches
Nexus 3200 Series Switches
Nexus 3100 Series Switches
Cisco NX-OS

Install updates from vendor's website.

Cisco NX-OS - addressed in versions 10.3(6), 10.3(7), 10.4(4), 10.5(2)

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n3kn9k-healthdos-eOqSWK4g

• Denial of service in Cisco Nexus 3000 and 9000 Series Switches