CVE-2026-20033
Cisco NX-OS Software Denial of Service Vulnerability
Description
A vulnerability in Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient validation when processing specific Ethernet frames. An attacker could exploit this vulnerability by sending a crafted Ethernet frame to the management interface of an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition. Note: Only the out-of-band (OOB) management interface is affected.
Weakness: CWE-805
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco NX-OS Software | Routing & Switching | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco NX-OS System Software in ACI Mode
Vendor advisory
Cisco Nexus 9000 Series Fabric Switches in ACI Mode Denial of Service Vulnerability
Cisco’s rating: High (advisory CVSS 7.4) · Published Feb 25, 2026
Bug ID: CSCwq96001
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from