# Cisco discloses critical Nexus 9000 remote code-execution flaw

_Tuesday, September 1, 2026 at 8:00 PM EDT · Security, Infrastructure · Latest · Tier 1 — Major_

![Cisco discloses critical Nexus 9000 remote code-execution flaw — Primary](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgj9su2Wd6Yb88IvMpg5v1P8IyPg4KWKTeBXjerFgxz0U5WLKO2U50jymR-fKujsKeMFZ3q1VEupMRFZUz5gD47JRzVceagYJJ3bCTT8t532rY63po54kanBCPX4_hmKsxe-1b52IGrYc__TH5Y2F13G6L32HNKPQxL34iqzEPuBGynDCu6xFdKHplXvdY/s1700-nu-rw-lo-l85-e365/cisco-flaws.jpg)

Cisco released patches for a reported critical vulnerability in 10 Silicon One-based Nexus 9000 switch models. The flaw, CVE-2026-20212, can allow an unauthenticated attacker able to reach TCP ports 43210 or 43211 to execute code as root; an attempt can also reload the device. Cisco said it was unaware of malicious exploitation as of its September 2 disclosure. The company directs customers to its Software Checker and lists access controls and a temporary Live Protect shield as interim measures.

## Sources

- [The Hacker News](https://thehackernews.com/2026/09/critical-cisco-nexus-9000-flaw-lets.html)

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Canonical: https://techandbusiness.org/newswire/mLDg07MxO7txKHcYYwAR8e
Retrieved: 2026-09-03T19:44:55.814Z
Publisher: Tech & Business (techandbusiness.org)