CVE-2026-20212

CVE Enrichment

CVSS: 9.8 CRITICAL
EPSS: 0.72%
EPSS Percentile: 53.42%
CISA KEV: Not listed

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: [email protected]
Published: 03-Sep-2026 00:17
Last Modified: 03-Sep-2026 20:04
EPSS Date: 2026-10-22
CWE: CWE-1327

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:L /
                            PR:N /
                            UI:N /
                            S:U /
                            C:H /
                            I:H /
                            A:H

References

[email protected]

Last enrichment sync: 22-Oct-2026 22:49
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

Cisco has issued urgent fixes for a critical Nexus 9000 flaw, CVE-2026-20212, that could let a remote unauthenticated attacker run code as root on affected Silicon One-based switches. Cisco Patches Critical Nexus 9000 Flaw Enabling Unauthenticated Remote Code Execution

CVE (7)

People (1)

Threat Actors (1)

MITRE ATT&CK (5)

Vendors (1)

Products (8)

Industries (1)

Countries (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.