🔐 CVE Alert

CVE-2026-20173

MEDIUM 5.8

Cisco NX-OS Software Denial of Service Vulnerability

CVSS Score
5.8
EPSS Score
0.0%
EPSS Percentile
0th

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.

CWE CWE-770
Vendor cisco
Product cisco nx-os software
Ecosystems
Industries
NetworkingTelecommunications
Published Oct 7, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
Low

Affected Versions

Cisco / Cisco NX-OS Software
8.2(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) 8.4(1) 7.3(0)DX(1) 7.3(2)D1(1) 9.3(1) 7.3(2)D1(2) 8.2(4) 9.3(1z) 9.2(2) 8.1(2a) 7.3(2)D1(3) 8.3(1) 7.3(1)D1(1) 7.3(0)D1(1) 9.3(3) 7.3(2)D1(1d) 9.3(4) 7.3(6)D1(1) 8.2(6) 9.3(5) 9.3(6) 8.4(4) 7.3(7)D1(1) 9.3(5w) 8.2(7) 9.3(7) 9.3(7k) 7.3(8)D1(1) 9.3(7a) 8.2(7a) 9.3(8) 8.4(4a) 8.4(5) 8.2(8) 9.3(9) 7.3(9)D1(1) 8.4(6) 9.3(10) 8.2(9) 10.3(1) 8.4(7) 10.3(2) 8.4(6a) 9.3(11) 10.3(3) 8.2(10) 9.3(12) 10.4(1) 8.4(8) 10.3(99w) 10.3(3w) 10.3(99x) 10.3(3o) 8.4(9) 10.3(4) 10.3(3p) 10.3(4a) 10.4(2) 10.3(3q) 9.3(13) 8.2(11) 10.3(5) 10.4(3) 10.3(3x) 10.3(4g) 10.5(1) 8.4(10) 10.3(3r) 10.3(6) 9.3(14) 10.4(4) 10.3(4h) 10.5(2) 8.4(11) 10.3(7) 10.4(5) 10.5(3) 9.3(15) 10.4(4g) 10.5(4) 8.4(12) 10.5(3t) 10.3(8) 10.4(6) 10.5(3s) 10.5(3e) 10.5(3o) 9.3(16) 10.5(3p) 10.4(7) 10.5(5) 9.3(17)

References

NVD ↗ CVE.org ↗ EPSS Data ↗
sec.cloudapps.cisco.com: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-nscpdos-SnderkC7