NX-OS (Nexus) 8.3 vulnerabilities

5 advisories affect Cisco NX-OS (Nexus) 8.3, 1 already exploited by attackers. Latest: October 7, 2026.

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Vulnerability	Severity	Affected versions
Cisco Advance Notification for Publication of October 7, 2026, Security Advisories CVE-2026-76455 +13 · October 7, 2026	Critical 9.8	8.3(2); 8.3(1)
Cisco NX-OS Software Security Hardening Release: October 2026 CVE-2026-76453 +5 · October 7, 2026	Critical 9.8	8.3(2); 8.3(1)
Cisco NX-OS Software Control Plane Denial of Service Vulnerability CVE-2026-20173 · October 7, 2026	Medium 5.8	8.3(2); 8.3(1)
Cisco NX-OS Software Python Sandbox Escape Vulnerability CVE-2026-20032 · October 7, 2026	Medium 4.4	8.3(2); 8.3(1)
Cisco NX-OS Command Injection Vulnerability CVE-2024-20399 · July 2, 2024	Medium 6 Exploited	8.3(2); 8.3(1)

Affected versions are compiled automatically from vendor advisories and NVD and may contain errors. Where no fixed version is shown, you will find it in the official advisory linked from every page: check it there before updating.

Other NX-OS (Nexus) versions: 16.2 · 16.1 · 16.0 · 15.3 · 15.2 · 10.6 · 10.5 · 10.4 · 10.3 · 9.4 · 9.3 · 9.2 · 8.5 · 8.4 · 8.2 · 8.1 · 7.3