CVE-2026-20173
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.
Weakness: CWE-770
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco NX-OS Software | Routing & Switching | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco NX-OS Software
Vendor advisory
cisco-sa-nxos-nscpdos-SnderkC7
Cisco NX-OS Software Control Plane Denial of Service Vulnerability
Cisco’s rating: Medium (advisory CVSS 5.8) · Published Oct 7, 2026
Bug IDs: CSCws28832 , CSCws61989
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from