CVE-2026-20173

MediumCVSS 5.8/10Last modified Oct 8, 2026

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.

Metrics

CVSS 3.1 5.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

Weakness enumeration

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
CiscoCisco NX-OS Software8.2(5); 7.3(5)D1(1); 8.4(2); 8.4(3); 9.2(3); 9.2(2v); 7.3(4)D1(1); 8.2(1); 9.2(1); 9.2(2t); 9.2(3y); 9.3(2); 8.1(1); 8.2(2); 8.3(2); 7.3(2)D1(3a); 9.2(4); 8.1(2); 7.3(3)D1(1); 8.2(3)

References

Timeline

Published
Oct 7, 2026
Last modified
Oct 8, 2026
NVD status
Awaiting Analysis

Related CVEs from 2026

CVE-2026-201744.9A vulnerability in the Metadata update feature of Cisco Nexus Dashboard Insights could allow an authenticated, remote attacker to write arbiCVE-2026-201756.1A vulnerability in Cisco Finesse could allow an unauthenticated, remote attacker to load arbitrary files from remote locations into an activCVE-2026-201769.1A vulnerability in Cisco ISE could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system CVE-2026-201775.3A vulnerability in the handling of management plane packets by Cisco Industrial Ethernet (IE) 1000 Series Switches could allow an unauthentiCVE-2026-201784.3A vulnerability in the browser-based version of Cisco Webex App could have allowed an unauthenticated, remote attacker to redirect users to CVE-2026-201795.8Multiple Cisco products are affected by a vulnerability in the Snort 3 Generic Routing Encapsulation (GRE) Detection Engine that could allowCVE-2026-20189.8A flaw has been found in itsourcecode School Management System 1.0. This affects an unknown part of the file /ramonsys/settings/controller.pCVE-2026-201809.9A vulnerability in Cisco Identity Services Engine (ISE) could allow an authenticated, remote attacker to execute arbitrary commands on the uCVE-2026-201819.1A vulnerability in Cisco ISE and ISE-PIC could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operaCVE-2026-2018210.0May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and fixed after the was dCVE-2026-201834.3A vulnerability in the web-based management interface of Cisco Identity Services Engine (ISE) could allow an authenticated, remote attacker CVE-2026-201849.8A vulnerability in the integration of single sign-on (SSO) with Control Hub in Cisco Webex Services could have allowed an unauthenticated, r
CVE-2026-20173: Medium severity, CVSS 5.8 | Vulnix