CVE-2026-20173 - Vulnerability Details

- Cisco NX-OS Software Denial of Service Vulnerability

Description

A vulnerability in Cisco NX-OS Software could allow an unauthenticated, remote attacker to exhaust system resources, causing a denial of service (DoS) condition.

This vulnerability exists because rate limiting was improperly applied to some protocols. An attacker could exploit this vulnerability by sending a high rate of UDP or TCP connections to a data plane interface on an affected device. A successful exploit could allow the attacker to cause instability to various routing and control plane protocols through some packet loss and temporary disruptions, causing a DoS condition. This DoS condition will clear without manual intervention soon after the high rate of traffic is stopped.

Published: 2026-10-07

Score: 5.8 Medium

EPSS: n/a

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco NX-OS Software

unknown

Version	Status	Constraints
`8.2(5)`	affected	—
`7.3(5)D1(1)`	affected	—
`8.4(2)`	affected	—
`8.4(3)`	affected	—
`9.2(3)`	affected	—
`9.2(2v)`	affected	—
`7.3(4)D1(1)`	affected	—
`8.2(1)`	affected	—
`9.2(1)`	affected	—
`9.2(2t)`	affected	—
`9.2(3y)`	affected	—
`9.3(2)`	affected	—
`8.1(1)`	affected	—
`8.2(2)`	affected	—
`8.3(2)`	affected	—
`7.3(2)D1(3a)`	affected	—
`9.2(4)`	affected	—
`8.1(2)`	affected	—
`7.3(3)D1(1)`	affected	—
`8.2(3)`	affected	—
`8.4(1)`	affected	—
`7.3(0)DX(1)`	affected	—
`7.3(2)D1(1)`	affected	—
`9.3(1)`	affected	—
`7.3(2)D1(2)`	affected	—
`8.2(4)`	affected	—
`9.3(1z)`	affected	—
`9.2(2)`	affected	—
`8.1(2a)`	affected	—
`7.3(2)D1(3)`	affected	—
`8.3(1)`	affected	—
`7.3(1)D1(1)`	affected	—
`7.3(0)D1(1)`	affected	—
`9.3(3)`	affected	—
`7.3(2)D1(1d)`	affected	—
`9.3(4)`	affected	—
`7.3(6)D1(1)`	affected	—
`8.2(6)`	affected	—
`9.3(5)`	affected	—
`9.3(6)`	affected	—
`8.4(4)`	affected	—
`7.3(7)D1(1)`	affected	—
`9.3(5w)`	affected	—
`8.2(7)`	affected	—
`9.3(7)`	affected	—
`9.3(7k)`	affected	—
`7.3(8)D1(1)`	affected	—
`9.3(7a)`	affected	—
`8.2(7a)`	affected	—
`9.3(8)`	affected	—
`8.4(4a)`	affected	—
`8.4(5)`	affected	—
`8.2(8)`	affected	—
`9.3(9)`	affected	—
`7.3(9)D1(1)`	affected	—
`8.4(6)`	affected	—
`9.3(10)`	affected	—
`8.2(9)`	affected	—
`10.3(1)`	affected	—
`8.4(7)`	affected	—
`10.3(2)`	affected	—
`8.4(6a)`	affected	—
`9.3(11)`	affected	—
`10.3(3)`	affected	—
`8.2(10)`	affected	—
`9.3(12)`	affected	—
`10.4(1)`	affected	—
`8.4(8)`	affected	—
`10.3(99w)`	affected	—
`10.3(3w)`	affected	—
`10.3(99x)`	affected	—
`10.3(3o)`	affected	—
`8.4(9)`	affected	—
`10.3(4)`	affected	—
`10.3(3p)`	affected	—
`10.3(4a)`	affected	—
`10.4(2)`	affected	—
`10.3(3q)`	affected	—
`9.3(13)`	affected	—
`8.2(11)`	affected	—
`10.3(5)`	affected	—
`10.4(3)`	affected	—
`10.3(3x)`	affected	—
`10.3(4g)`	affected	—
`10.5(1)`	affected	—
`8.4(10)`	affected	—
`10.3(3r)`	affected	—
`10.3(6)`	affected	—
`9.3(14)`	affected	—
`10.4(4)`	affected	—
`10.3(4h)`	affected	—
`10.5(2)`	affected	—
`8.4(11)`	affected	—
`10.3(7)`	affected	—
`10.4(5)`	affected	—
`10.5(3)`	affected	—
`9.3(15)`	affected	—
`10.4(4g)`	affected	—
`10.5(4)`	affected	—
`8.4(12)`	affected	—
`10.5(3t)`	affected	—
`10.3(8)`	affected	—
`10.4(6)`	affected	—
`10.5(3s)`	affected	—
`10.5(3e)`	affected	—
`10.5(3o)`	affected	—
`9.3(16)`	affected	—
`10.5(3p)`	affected	—
`10.4(7)`	affected	—
`10.5(5)`	affected	—
`9.3(17)`	affected	—

No data.

Vendor Product Confidence Versions

Cisco

Nx-os Software

95%

Version	Status	Scheme	Platform
`8.2(5)`	affected	generic	—
`7.3(5)D1(1)`	affected	generic	—
`8.4(2)`	affected	generic	—
`8.4(3)`	affected	generic	—
`9.2(3)`	affected	generic	—
`9.2(2v)`	affected	generic	—
`7.3(4)D1(1)`	affected	generic	—
`8.2(1)`	affected	generic	—
`9.2(1)`	affected	generic	—
`9.2(2t)`	affected	generic	—
`9.2(3y)`	affected	generic	—
`9.3(2)`	affected	generic	—
`8.1(1)`	affected	generic	—
`8.2(2)`	affected	generic	—
`8.3(2)`	affected	generic	—
`7.3(2)D1(3a)`	affected	generic	—
`9.2(4)`	affected	generic	—
`8.1(2)`	affected	generic	—
`7.3(3)D1(1)`	affected	generic	—
`8.2(3)`	affected	generic	—
`8.4(1)`	affected	generic	—
`7.3(0)DX(1)`	affected	generic	—
`7.3(2)D1(1)`	affected	generic	—
`9.3(1)`	affected	generic	—
`7.3(2)D1(2)`	affected	generic	—
`8.2(4)`	affected	generic	—
`9.3(1z)`	affected	generic	—
`9.2(2)`	affected	generic	—
`8.1(2a)`	affected	generic	—
`7.3(2)D1(3)`	affected	generic	—
`8.3(1)`	affected	generic	—
`7.3(1)D1(1)`	affected	generic	—
`7.3(0)D1(1)`	affected	generic	—
`9.3(3)`	affected	generic	—
`7.3(2)D1(1d)`	affected	generic	—
`9.3(4)`	affected	generic	—
`7.3(6)D1(1)`	affected	generic	—
`8.2(6)`	affected	generic	—
`9.3(5)`	affected	generic	—
`9.3(6)`	affected	generic	—
`8.4(4)`	affected	generic	—
`7.3(7)D1(1)`	affected	generic	—
`9.3(5w)`	affected	generic	—
`8.2(7)`	affected	generic	—
`9.3(7)`	affected	generic	—
`9.3(7k)`	affected	generic	—
`7.3(8)D1(1)`	affected	generic	—
`9.3(7a)`	affected	generic	—
`8.2(7a)`	affected	generic	—
`9.3(8)`	affected	generic	—
`8.4(4a)`	affected	generic	—
`8.4(5)`	affected	generic	—
`8.2(8)`	affected	generic	—
`9.3(9)`	affected	generic	—
`7.3(9)D1(1)`	affected	generic	—
`8.4(6)`	affected	generic	—
`9.3(10)`	affected	generic	—
`8.2(9)`	affected	generic	—
`10.3(1)`	affected	generic	—
`8.4(7)`	affected	generic	—
`10.3(2)`	affected	generic	—
`8.4(6a)`	affected	generic	—
`9.3(11)`	affected	generic	—
`10.3(3)`	affected	generic	—
`8.2(10)`	affected	generic	—
`9.3(12)`	affected	generic	—
`10.4(1)`	affected	generic	—
`8.4(8)`	affected	generic	—
`10.3(99w)`	affected	generic	—
`10.3(3w)`	affected	generic	—
`10.3(99x)`	affected	generic	—
`10.3(3o)`	affected	generic	—
`8.4(9)`	affected	generic	—
`10.3(4)`	affected	generic	—
`10.3(3p)`	affected	generic	—
`10.3(4a)`	affected	generic	—
`10.4(2)`	affected	generic	—
`10.3(3q)`	affected	generic	—
`9.3(13)`	affected	generic	—
`8.2(11)`	affected	generic	—
`10.3(5)`	affected	generic	—
`10.4(3)`	affected	generic	—
`10.3(3x)`	affected	generic	—
`10.3(4g)`	affected	generic	—
`10.5(1)`	affected	generic	—
`8.4(10)`	affected	generic	—
`10.3(3r)`	affected	generic	—
`10.3(6)`	affected	generic	—
`9.3(14)`	affected	generic	—
`10.4(4)`	affected	generic	—
`10.3(4h)`	affected	generic	—
`10.5(2)`	affected	generic	—
`8.4(11)`	affected	generic	—
`10.3(7)`	affected	generic	—
`10.4(5)`	affected	generic	—
`10.5(3)`	affected	generic	—
`9.3(15)`	affected	generic	—
`10.4(4g)`	affected	generic	—
`10.5(4)`	affected	generic	—
`8.4(12)`	affected	generic	—
`10.5(3t)`	affected	generic	—
`10.3(8)`	affected	generic	—
`10.4(6)`	affected	generic	—
`10.5(3s)`	affected	generic	—
`10.5(3e)`	affected	generic	—
`10.5(3o)`	affected	generic	—
`9.3(16)`	affected	generic	—
`10.5(3p)`	affected	generic	—
`10.4(7)`	affected	generic	—
`10.5(5)`	affected	generic	—
`9.3(17)`	affected	generic	—

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Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-nscpdos-SnderkC7

History

Wed, 07 Oct 2026 19:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Wed, 07 Oct 2026 18:30:00 +0000

Type	Values Removed	Values Added
First Time appeared		Cisco Cisco nx-os Software
Vendors & Products		Cisco Cisco nx-os Software

Wed, 07 Oct 2026 16:30:00 +0000

Type	Values Removed	Values Added
Description		A vulnerability in Cisco NX-OS Software could allow an unauthenticated, remote attacker to exhaust system resources, causing a denial of service (DoS) condition. This vulnerability exists because rate limiting was improperly applied to some protocols. An attacker could exploit this vulnerability by sending a high rate of UDP or TCP connections to a data plane interface on an affected device. A successful exploit could allow the attacker to cause instability to various routing and control plane protocols through some packet loss and temporary disruptions, causing a DoS condition. This DoS condition will clear without manual intervention soon after the high rate of traffic is stopped.
Title		Cisco NX-OS Software Denial of Service Vulnerability
Weaknesses		CWE-770
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-nscpdos-SnderkC7
Metrics		cvssV3_1 `{'score': 5.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L'}`

Subscriptions

Cisco Nx-os Software

MITRE

Status: PUBLISHED

Assigner: cisco

Published: 2026-10-07T16:12:04.505Z

Updated: 2026-10-07T17:42:39.672Z

Reserved: 2025-10-08T11:59:15.392Z

Link: CVE-2026-20173

Vulnrichment

Updated: 2026-10-07T17:42:31.052Z

NVD

Status : Received

Published: 2026-10-07T17:16:54.843

Modified: 2026-10-07T18:17:19.937

Link: CVE-2026-20173

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-10-07T18:30:14Z

Weaknesses

CWE-770
Allocation of Resources Without Limits or Throttling

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Exploitation none

Automatable yes

Technical Impact partial

Subscriptions

JSON object

JSON object

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