Riskcovery

CVE-2026-20173

Cisco NX-OS Software Denial of Service Vulnerability

State
Published
Severity
5.8 Medium
Published
Oct 7, 2026
Updated
Oct 7, 2026
Reserved
Oct 8, 2025

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.15.8 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Lcisco

Weaknesses

  • CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

ProductVersions
Cisco NX-OS SoftwareCisco
  • 8.2(5)Affected
  • 7.3(5)D1(1)Affected
  • 8.4(2)Affected
  • 8.4(3)Affected
  • 9.2(3)Affected
  • 9.2(2v)Affected
  • 7.3(4)D1(1)Affected
  • 8.2(1)Affected
  • 9.2(1)Affected
  • 9.2(2t)Affected
  • 9.2(3y)Affected
  • 9.3(2)Affected
  • 8.1(1)Affected
  • 8.2(2)Affected
  • 8.3(2)Affected
  • 7.3(2)D1(3a)Affected
  • 9.2(4)Affected
  • 8.1(2)Affected
  • 7.3(3)D1(1)Affected
  • 8.2(3)Affected
  • 8.4(1)Affected
  • 7.3(0)DX(1)Affected
  • 7.3(2)D1(1)Affected
  • 9.3(1)Affected
  • 7.3(2)D1(2)Affected
  • and 86 more versions

References

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