Detections
Analytics

Cisco NX-OS Software Control Plane DoS (cisco-sa-nxos-nscpdos-SnderkC7)

medium Nessus Plugin ID 363871

Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco NX-OS Software is affected by a vulnerability.

 - 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. (CVE-2026-20173)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCws28832, CSCws61989

See Also

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCws28832

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCws61989

http://www.nessus.org/u?89dd3384

Plugin Details

Severity: Medium

ID: 363871

File Name: cisco-sa-nxos-nscpdos-SnderkC7.nasl

Version: 1.1

Type: Combined

Family: CISCO

Published: 10/7/2026

Updated: 10/7/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-20173

CVSS v3

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 5.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:nx-os

Required KB Items: Settings/ParanoidReport, Host/Cisco/NX-OS/Version, Host/Cisco/NX-OS/Model, Host/Cisco/NX-OS/Device

Exploit Ease: No known exploits are available

Patch Publication Date: 10/7/2026

Vulnerability Publication Date: 10/7/2026

Reference Information

CVE: CVE-2026-20173