Medium
Cisco NX-OS Software Denial of Service 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.
Announced Source revision 1
Original source ↗CVE-2026-20173
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-20173
Cisco NX-OS Software
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "Cisco",
"product": "Cisco NX-OS Software",
"versions": [
{
"status": "affected",
"version": "8.2(5)"
},
{
"status": "affected",
"version": "7.3(5)D1(1)"
},
{
"status": "affected",
"version": "8.4(2)"
},
{
"status": "affected",
"version": "8.4(3)"
},
{
"status": "affected",
"version": "9.2(3)"
},
{
"status": "affected",
"version": "9.2(2v)"
},
{
"status": "affected",
"version": "7.3(4)D1(1)"
},
{
"status": "affected",
"version": "8.2(1)"
},
{
"status": "affected",
"version": "9.2(1)"
},
{
"status": "affected",
"version": "9.2(2t)"
},
{
"status": "affected",
"version": "9.2(3y)"
},
{
"status": "affected",
"version": "9.3(2)"
},
{
"status": "affected",
"version": "8.1(1)"
},
{
"status": "affected",
"version": "8.2(2)"
},
{
"status": "affected",
"version": "8.3(2)"
},
{
"status": "affected",
"version": "7.3(2)D1(3a)"
},
{
"status": "affected",
"version": "9.2(4)"
},
{
"status": "affected",
"version": "8.1(2)"
},
{
"status": "affected",
"version": "7.3(3)D1(1)"
},
{
"status": "affected",
"version": "8.2(3)"
},
{
"status": "affected",
"version": "8.4(1)"
},
{
"status": "affected",
"version": "7.3(0)DX(1)"
},
{
"status": "affected",
"version": "7.3(2)D1(1)"
},
{
"status": "affected",
"version": "9.3(1)"
},
{
"status": "affected",
"version": "7.3(2)D1(2)"
},
{
"status": "affected",
"version": "8.2(4)"
},
{
"status": "affected",
"version": "9.3(1z)"
},
{
"status": "affected",
"version": "9.2(2)"
},
{
"status": "affected",
"version": "8.1(2a)"
},
{
"status": "affected",
"version": "7.3(2)D1(3)"
},
{
"status": "affected",
"version": "8.3(1)"
},
{
"status": "affected",
"version": "7.3(1)D1(1)"
},
{
"status": "affected",
"version": "7.3(0)D1(1)"
},
{
"status": "affected",
"version": "9.3(3)"
},
{
"status": "affected",
"version": "7.3(2)D1(1d)"
},
{
"status": "affected",
"version": "9.3(4)"
},
{
"status": "affected",
"version": "7.3(6)D1(1)"
},
{
"status": "affected",
"version": "8.2(6)"
},
{
"status": "affected",
"version": "9.3(5)"
},
{
"status": "affected",
"version": "9.3(6)"
},
{
"status": "affected",
"version": "8.4(4)"
},
{
"status": "affected",
"version": "7.3(7)D1(1)"
},
{
"status": "affected",
"version": "9.3(5w)"
},
{
"status": "affected",
"version": "8.2(7)"
},
{
"status": "affected",
"version": "9.3(7)"
},
{
"status": "affected",
"version": "9.3(7k)"
},
{
"status": "affected",
"version": "7.3(8)D1(1)"
},
{
"status": "affected",
"version": "9.3(7a)"
},
{
"status": "affected",
"version": "8.2(7a)"
},
{
"status": "affected",
"version": "9.3(8)"
},
{
"status": "affected",
"version": "8.4(4a)"
},
{
"status": "affected",
"version": "8.4(5)"
},
{
"status": "affected",
"version": "8.2(8)"
},
{
"status": "affected",
"version": "9.3(9)"
},
{
"status": "affected",
"version": "7.3(9)D1(1)"
},
{
"status": "affected",
"version": "8.4(6)"
},
{
"status": "affected",
"version": "9.3(10)"
},
{
"status": "affected",
"version": "8.2(9)"
},
{
"status": "affected",
"version": "10.3(1)"
},
{
"status": "affected",
"version": "8.4(7)"
},
{
"status": "affected",
"version": "10.3(2)"
},
{
"status": "affected",
"version": "8.4(6a)"
},
{
"status": "affected",
"version": "9.3(11)"
},
{
"status": "affected",
"version": "10.3(3)"
},
{
"status": "affected",
"version": "8.2(10)"
},
{
"status": "affected",
"version": "9.3(12)"
},
{
"status": "affected",
"version": "10.4(1)"
},
{
"status": "affected",
"version": "8.4(8)"
},
{
"status": "affected",
"version": "10.3(99w)"
},
{
"status": "affected",
"version": "10.3(3w)"
},
{
"status": "affected",
"version": "10.3(99x)"
},
{
"status": "affected",
"version": "10.3(3o)"
},
{
"status": "affected",
"version": "8.4(9)"
},
{
"status": "affected",
"version": "10.3(4)"
},
{
"status": "affected",
"version": "10.3(3p)"
},
{
"status": "affected",
"version": "10.3(4a)"
},
{
"status": "affected",
"version": "10.4(2)"
},
{
"status": "affected",
"version": "10.3(3q)"
},
{
"status": "affected",
"version": "9.3(13)"
},
{
"status": "affected",
"version": "8.2(11)"
},
{
"status": "affected",
"version": "10.3(5)"
},
{
"status": "affected",
"version": "10.4(3)"
},
{
"status": "affected",
"version": "10.3(3x)"
},
{
"status": "affected",
"version": "10.3(4g)"
},
{
"status": "affected",
"version": "10.5(1)"
},
{
"status": "affected",
"version": "8.4(10)"
},
{
"status": "affected",
"version": "10.3(3r)"
},
{
"status": "affected",
"version": "10.3(6)"
},
{
"status": "affected",
"version": "9.3(14)"
},
{
"status": "affected",
"version": "10.4(4)"
},
{
"status": "affected",
"version": "10.3(4h)"
},
{
"status": "affected",
"version": "10.5(2)"
},
{
"status": "affected",
"version": "8.4(11)"
},
{
"status": "affected",
"version": "10.3(7)"
},
{
"status": "affected",
"version": "10.4(5)"
},
{
"status": "affected",
"version": "10.5(3)"
},
{
"status": "affected",
"version": "9.3(15)"
},
{
"status": "affected",
"version": "10.4(4g)"
},
{
"status": "affected",
"version": "10.5(4)"
},
{
"status": "affected",
"version": "8.4(12)"
},
{
"status": "affected",
"version": "10.5(3t)"
},
{
"status": "affected",
"version": "10.3(8)"
},
{
"status": "affected",
"version": "10.4(6)"
},
{
"status": "affected",
"version": "10.5(3s)"
},
{
"status": "affected",
"version": "10.5(3e)"
},
{
"status": "affected",
"version": "10.5(3o)"
},
{
"status": "affected",
"version": "9.3(16)"
},
{
"status": "affected",
"version": "10.5(3p)"
},
{
"status": "affected",
"version": "10.4(7)"
},
{
"status": "affected",
"version": "10.5(5)"
},
{
"status": "affected",
"version": "9.3(17)"
}
],
"defaultStatus": "unknown"
}
]- Related CVEs
- CVE-2026-20173
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #12067 · Revision 1
- Added to Heist Feed
- Publisher date