CVE-2026-20033
Cisco NX-OS Software Denial of Service Vulnerability
Severity
High 7.4
CVSS 3.1
Exploited
Not listed
EPSS
0.002
5.5th percentile
Discovered by
Third party
Published by the vendor
Published
Feb 25, 2026
Assigned by cisco
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 affected versions (1)
- Cisco · Cisco NX-OS System Software in ACI Mode