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Cisco Nexus 9000 Series Fabric Switches in ACI Mode Denial of Service Vulnerability

cisco-sa-nxos-cpdos-qLsv6pFD · High · Published · Updated

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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-cpdos-qLsv6pFD This advisory is part of the February 2026 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: February 2026 Semiannual Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.

Cisco advisory ·CSAF JSON

Workarounds

There are no workarounds that address this vulnerability.

CVEsCVE-2026-20033
Cisco Bug IDsCSCwq96001
CVSS ScoreBase 7.4
Base 7.4 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Product Names From Source
Cisco NX-OS System Software in ACI Mode 15.2(1g), Cisco NX-OS System Software in ACI Mode 15.2(2e), Cisco NX-OS System Software in ACI Mode 15.2(2f), Cisco NX-OS System Software in ACI Mode 15.2(2g), Cisco NX-OS System Software in ACI Mode 15.2(2h), Cisco NX-OS System Software in ACI Mode 15.2(3e), Cisco NX-OS System Software in ACI Mode 15.2(3f), Cisco NX-OS System Software in ACI Mode 15.2(3g), Cisco NX-OS System Software in ACI Mode 15.2(4d), Cisco NX-OS System Software in ACI Mode 15.2(4e), Cisco NX-OS System Software in ACI Mode 15.2(5c), Cisco NX-OS System Software in ACI Mode 15.2(5d), Cisco NX-OS System Software in ACI Mode 15.2(5e), Cisco NX-OS System Software in ACI Mode 15.2(4f), Cisco NX-OS System Software in ACI Mode 15.2(6e), Cisco NX-OS System Software in ACI Mode 15.2(6g), Cisco NX-OS System Software in ACI Mode 15.2(7f), Cisco NX-OS System Software in ACI Mode 15.2(7g), Cisco NX-OS System Software in ACI Mode 15.2(6h), Cisco NX-OS System Software in ACI Mode 15.2(8d), Cisco NX-OS System Software in ACI Mode 15.2(8e), Cisco NX-OS System Software in ACI Mode 15.2(8f), Cisco NX-OS System Software in ACI Mode 15.2(8g), Cisco NX-OS System Software in ACI Mode 15.2(8h), Cisco NX-OS System Software in ACI Mode 15.2(8i), Cisco NX-OS System Software in ACI Mode 16.0(1g), Cisco NX-OS System Software in ACI Mode 16.0(1j), Cisco NX-OS System Software in ACI Mode 16.0(2h), Cisco NX-OS System Software in ACI Mode 16.0(2j), Cisco NX-OS System Software in ACI Mode 16.0(3d), Cisco NX-OS System Software in ACI Mode 16.0(3e), Cisco NX-OS System Software in ACI Mode 16.0(4c), Cisco NX-OS System Software in ACI Mode 16.0(5h), Cisco NX-OS System Software in ACI Mode 16.0(3g), Cisco NX-OS System Software in ACI Mode 16.0(5j), Cisco NX-OS System Software in ACI Mode 16.0(6c), Cisco NX-OS System Software in ACI Mode 16.0(7e), Cisco NX-OS System Software in ACI Mode 16.0(8e), Cisco NX-OS System Software in ACI Mode 16.0(8f), Cisco NX-OS System Software in ACI Mode 16.0(9c), Cisco NX-OS System Software in ACI Mode 16.0(9d), Cisco NX-OS System Software in ACI Mode 16.0(6h), Cisco NX-OS System Software in ACI Mode 16.0(8h), Cisco NX-OS System Software in ACI Mode 16.0(9e), Cisco NX-OS System Software in ACI Mode 15.3(1d), Cisco NX-OS System Software in ACI Mode 15.3(2a), Cisco NX-OS System Software in ACI Mode 15.3(2b), Cisco NX-OS System Software in ACI Mode 15.3(2c), Cisco NX-OS System Software in ACI Mode 15.3(2d), Cisco NX-OS System Software in ACI Mode 15.3(2e), Cisco NX-OS System Software in ACI Mode 15.3(2f), Cisco NX-OS System Software in ACI Mode 16.1(1f), Cisco NX-OS System Software in ACI Mode 16.1(2f), Cisco NX-OS System Software in ACI Mode 16.1(2g), Cisco NX-OS System Software in ACI Mode 16.1(3f), Cisco NX-OS System Software in ACI Mode 16.1(3g), Cisco NX-OS System Software in ACI Mode 16.1(4h), Cisco NX-OS System Software in ACI Mode, Cisco Nexus 9000 Series Switches

CSAF Product Statuses

Product Status Source CVE Rows
Cisco NX-OS System Software in ACI Mode 15.2(1g) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2026-20033 1
Cisco NX-OS System Software in ACI Mode 15.2(2e) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2026-20033 1
Cisco NX-OS System Software in ACI Mode 15.2(2f) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2026-20033 1
Cisco NX-OS System Software in ACI Mode 15.2(2g) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2026-20033 1
Cisco NX-OS System Software in ACI Mode 15.2(2h) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2026-20033 1
Cisco NX-OS System Software in ACI Mode 15.2(3e) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2026-20033 1
Cisco NX-OS System Software in ACI Mode 15.2(3f) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2026-20033 1
Cisco NX-OS System Software in ACI Mode 15.2(3g) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2026-20033 1
Cisco NX-OS System Software in ACI Mode 15.2(4d) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2026-20033 1
Cisco NX-OS System Software in ACI Mode 15.2(4e) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2026-20033 1
Cisco NX-OS System Software in ACI Mode 15.2(4f) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2026-20033 1
Cisco NX-OS System Software in ACI Mode 15.2(5c) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2026-20033 1

Showing 12 of 57 CSAF status groups; 45 more not shown.

Related Products

Product CVE Evidence
Cisco Firepower Extensible Operating System (FXOS) CVE-2026-20033 Cisco OpenVuln
Cisco NX-OS Software CVE-2026-20033 Cisco OpenVuln
Cisco NX-OS System Software in ACI Mode CVE-2026-20033 Cisco OpenVuln
Cisco Nexus 9000 Series Switches CVE-2026-20033 Cisco OpenVuln · family-level