🔐 CVE Alert

CVE-2026-20033

HIGH 7.4

Cisco NX-OS Software Denial of Service Vulnerability

CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
0th

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.

CWE CWE-805
Vendor cisco
Product cisco nx-os system software in aci mode
Ecosystems
Industries
NetworkingTelecommunications
Published Feb 25, 2026
Last Updated Feb 25, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High

Affected Versions

Cisco / Cisco NX-OS System Software in ACI Mode
15.2(1g) 15.2(2e) 15.2(2f) 15.2(2g) 15.2(2h) 15.2(3f) 15.2(3e) 15.2(3g) 15.2(4d) 15.2(4e) 15.2(5c) 15.2(5d) 16.0(1g) 15.2(5e) 15.2(4f) 15.2(6e) 15.2(6h) 16.0(1j) 15.2(6g) 15.2(7f) 15.2(7g) 16.0(2h) 15.2(8d) 16.0(2j) 15.2(8e) 16.0(3d) 16.0(3e) 15.2(8f) 15.2(8g) 15.3(1d) 15.2(8h) 16.0(4c) 15.3(2a) 15.2(8i) 16.0(5h) 15.3(2b) 16.0(3g) 16.0(5j) 15.3(2c) 16.0(6c) 15.3(2d) 16.1(1f) 16.0(7e) 16.0(8e) 15.3(2e) 16.0(8f) 16.1(2f) 16.1(2g) 15.3(2f) 16.0(9c) 16.1(3f) 16.0(9d) 16.0(6h) 16.0(8h) 16.1(3g) 16.0(9e) 16.1(4h)

References

NVD ↗ CVE.org ↗ EPSS Data ↗
sec.cloudapps.cisco.com: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-cpdos-qLsv6pFD