Cisco NX-OS Software up to 10.5(5) Rate Limiting denial of service

Summaryinfo

A vulnerability, which was classified as critical, was found in Cisco NX-OS Software. Affected by this vulnerability is an unknown functionality of the component Rate Limiting. The manipulation results in denial of service. This vulnerability is cataloged as CVE-2026-20173. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Cisco NX-OS Software. Affected is some unknown functionality of the component Rate Limiting. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is available at sec.cloudapps.cisco.com. This vulnerability is traded as CVE-2026-20173 since 10/08/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/07/2026). This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• NX-OS Software

Version

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

License

• commercial

Website

• Vendor: https://www.cisco.com/

CPE 2.3info

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Entryinfo

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