Cisco NX-OS Software up to 10.6(3s) Silicon One integration privileges management

Summaryinfo

A vulnerability described as very critical has been identified in Cisco NX-OS Software. This impacts an unknown function of the component Silicon One integration. Executing a manipulation can lead to privileges management. This vulnerability is tracked as CVE-2026-20212. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability classified as very critical was found in Cisco NX-OS Software. This vulnerability affects an unknown code block of the component Silicon One integration. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A vulnerability in the Silicon One integration for Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to execute code with root privileges. This vulnerability exists because TCP ports 43210 and 43211 are accessible in the default Layer 3 (L3) virtual routing and forwarding (VRF). A successful exploit could allow the attacker to connect to an affected device and send crafted input that could be executed as code with root privileges. The exploitation of this vulnerability could also cause the S1HAL process to crash, which could cause the device to reload.

The advisory is available at sec.cloudapps.cisco.com. This vulnerability was named CVE-2026-20212 since 10/08/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 09/02/2026). This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-70201). 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

• 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(9)
• 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)
• 10.6(1)
• 10.6(1s)
• 10.6(2)
• 10.6(2n)
• 10.6(2s)
• 10.6(3)
• 10.6(3s)

License

• commercial

Website

• Vendor: https://www.cisco.com/

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

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