CVE-2026-20212

CVE CVE-2026-20212EUVD EUVD-2026-70201Published 2026-09-02T16:13:08.000ZLast changed 2026-09-03T03:56:34.000ZCVSS 9.8

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Cisco — Cisco NX-OS Software 10.3(3q); 10.6(3); 10.5(3s); 10.4(6); 10.3(7); 10.5(3e); 10.3(3); 10.3(4h); 10.3(3o); 10.3(5); 10.4(2); 10.3(4g); 10.4(1); 10.3(1); 10.4(4); 10.4(7); 10.3(99x); 10.6(2); 10.3(4a); 10.3(3p); 10.5(3); 10.5(3o); 10.6(1); 10.6(2s); 10.3(3w); 10.6(2n); 10.5(4); 10.3(99w); 10.3(2); 10.3(9); 10.4(4g); 10.4(3); 10.5(3t); 10.3(8); 10.3(3x); 10.5(2); 10.6(3s); 10.3(4); 10.3(6); 10.5(3p); 10.5(5); 10.5(1); 10.4(5); 10.3(3r); 10.6(1s)

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Cisco — NX-OS Software

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.