CVE-2026-20033

Cisco NX-OS Software Denial of Service Vulnerability

Published: Feb 25, 2026Updated: Feb 27, 2026 Sources: CVE List NVDCWE-805

NVD MITRE

7.4CVSSHIGH

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.

CVSS Vector Breakdown

Exploitability

AV:AAttack Vector

Adjacent

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:CScope

Changed

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-805

Affected Products

Cisco NX-OS System Software in ACI Mode Cisco

On-prem

Networking Infrastructure / router-switch

ciscocommercialUSNetworking Infrastructureaka cisco systems, cisco systems inc.

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

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References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-cpdos-qLsv6pFD

sec.cloudapps.cisco.com

Timeline

Published

Feb 25, 2026

Last Updated

Feb 27, 2026

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