Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Cisco | Cisco NX-OS Software | 10.3(1), 10.3(2), 10.3(3), 10.4(1), 10.3(99w), 10.3(3w), 10.3(99x), 10.3(3o), 10.3(4), 10.3(3p), 10.3(4a), 10.4(2), 10.3(3q), 10.3(5), 10.4(3), 10.3(3x), 10.3(4g), 10.5(1), 10.3(3r), 10.3(6), 10.4(4), 10.3(4h), 10.5(2), 10.3(7), 10.4(5), 10.5(3), 10.4(4g), 10.5(4), 10.6(1), 10.5(3t), 10.3(8), 10.4(… | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
-
HORKimhab/CVE-2026-20212 ★ 1 · Sep 3, 2026
CVE-2026-20212 - Draft or TODO
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 2
- NCSC-2026-0338 Kwetsbaarheden verholpen in Cisco Nexus 9000 Series, IOS XR Software en Secure Email NCSC-NL (Netherlands) · Sep 3, 2026
- WID-SEC-2026-3157 Cisco Nexus: Schwachstelle ermöglicht Ausführen von beliebigem Programmcode mit Administratorrechten BSI CERT-Bund (WID) · Sep 2, 2026