Critical severity9.8NVD Advisory· Published Sep 2, 2026· Updated Sep 3, 2026
CVE-2026-20212
CVE-2026-20212
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.
AI Insight
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Affected products
1Patches
Vulnerability mechanics
References
1News mentions
8- Critical Cisco Nexus Flaws Let Unauthenticated Attackers Execute Code With Root PrivilegesCyber Security News · Oct 8, 2026
- ⚡ Weekly Recap: Chrome 0-Day, Router Hijacks, Coder Supply Chain Attack and MoreThe Hacker News · Sep 7, 2026
- Weekly Cybersecurity Newsletter Bulletin – CrowdStrike Falcon, Chrome 0-Day, GPT-6 Astra, Dropbox Breach and 20+ StoriesCyber Security News · Sep 7, 2026
- Cisco searched for IOS XR bugs and found so many it rolled them into an update releaseThe Register Security · Sep 4, 2026
- Critical Cisco Nexus 9000 Flaw Lets Unauthenticated Remote Attackers Run Code as RootThe Hacker News · Sep 3, 2026
- Cisco Warns of Unpatched Secure Email Flaws, Patches Critical Switch VulnerabilitiesSecurityWeek · Sep 3, 2026
- Cisco Nexus 9000 Series Switches Flaw Allows Remote Attackers to Execute Malicious CodeCyber Security News · Sep 3, 2026
- Cisco Systems: 11 Vulnerabilities Disclosed in IOS XR, Secure Email, Nexus 9000, and IP PhonesVypr Intelligence · Sep 2, 2026