Vulnerability-Lookup

GHSA-6G5H-4MV8-PRV7

Vulnerability from github – Published: 2026-09-02 18:32 – Updated: 2026-09-02 18:32

Details

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.

Severity

9.8 (Critical)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-20212"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1327"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-02T17:17:31Z",
    "severity": "CRITICAL"
  },
  "details": "A vulnerability in the Silicon One integration for Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to execute code with\u0026nbsp;root privileges.\n\nThis 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\u0026nbsp;root privileges. The exploitation of this vulnerability could also cause the S1HAL process to crash, which could cause the device to reload.",
  "id": "GHSA-6g5h-4mv8-prv7",
  "modified": "2026-09-02T18:32:25Z",
  "published": "2026-09-02T18:32:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-20212"
    },
    {
      "type": "WEB",
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9k-s1-rce-EH8dEtr"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-20212 (GCVE-0-2026-20212)

Vulnerability from cvelistv5 – Published: 2026-09-02 16:13 – Updated: 2026-09-03 03:56

Title

Cisco Nexus 3000 and 9000 Series Switches Silicon One Hardware Abstraction Layer Remote Code Execution Vulnerability

Summary

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.

Severity

9.8 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 00:00 UTC

CWE

CWE-1327 - Binding to an Unrestricted IP Address

Assigner

cisco mitre root

References

1 reference

URL	Tags
https://sec.cloudapps.cisco.com/security/center/c…

Impacted products

1 product

Vendor	Product	Version
Cisco	Cisco NX-OS Software	Affected: 10.3(1) Affected: 10.3(2) Affected: 10.3(3) Affected: 10.4(1) Affected: 10.3(99w) Affected: 10.3(3w) Affected: 10.3(99x) Affected: 10.3(3o) Affected: 10.3(4) Affected: 10.3(3p) Affected: 10.3(4a) Affected: 10.4(2) Affected: 10.3(3q) Affected: 10.3(5) Affected: 10.4(3) Affected: 10.3(3x) Affected: 10.3(4g) Affected: 10.5(1) Affected: 10.3(3r) Affected: 10.3(6) Affected: 10.4(4) Affected: 10.3(4h) Affected: 10.5(2) Affected: 10.3(7) Affected: 10.4(5) Affected: 10.5(3) Affected: 10.4(4g) Affected: 10.5(4) Affected: 10.6(1) Affected: 10.5(3t) Affected: 10.3(8) Affected: 10.4(6) Affected: 10.5(3s) Affected: 10.5(3e) Affected: 10.5(3o) Affected: 10.6(1s) Affected: 10.6(2) Affected: 10.5(3p) Affected: 10.3(9) Affected: 10.6(2s) Affected: 10.6(3) Affected: 10.4(7) Affected: 10.5(5) Affected: 10.6(2n) Affected: 10.6(3s)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-20212",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-02T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-03T03:56:34.679Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Cisco NX-OS Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "10.3(1)"
            },
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              "status": "affected",
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              "status": "affected",
              "version": "10.3(3)"
            },
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              "status": "affected",
              "version": "10.4(1)"
            },
            {
              "status": "affected",
              "version": "10.3(99w)"
            },
            {
              "status": "affected",
              "version": "10.3(3w)"
            },
            {
              "status": "affected",
              "version": "10.3(99x)"
            },
            {
              "status": "affected",
              "version": "10.3(3o)"
            },
            {
              "status": "affected",
              "version": "10.3(4)"
            },
            {
              "status": "affected",
              "version": "10.3(3p)"
            },
            {
              "status": "affected",
              "version": "10.3(4a)"
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              "status": "affected",
              "version": "10.4(2)"
            },
            {
              "status": "affected",
              "version": "10.3(3q)"
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            {
              "status": "affected",
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            {
              "status": "affected",
              "version": "10.4(3)"
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              "status": "affected",
              "version": "10.3(3x)"
            },
            {
              "status": "affected",
              "version": "10.3(4g)"
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              "status": "affected",
              "version": "10.5(1)"
            },
            {
              "status": "affected",
              "version": "10.3(3r)"
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            {
              "status": "affected",
              "version": "10.3(6)"
            },
            {
              "status": "affected",
              "version": "10.4(4)"
            },
            {
              "status": "affected",
              "version": "10.3(4h)"
            },
            {
              "status": "affected",
              "version": "10.5(2)"
            },
            {
              "status": "affected",
              "version": "10.3(7)"
            },
            {
              "status": "affected",
              "version": "10.4(5)"
            },
            {
              "status": "affected",
              "version": "10.5(3)"
            },
            {
              "status": "affected",
              "version": "10.4(4g)"
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            {
              "status": "affected",
              "version": "10.5(4)"
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              "status": "affected",
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            },
            {
              "status": "affected",
              "version": "10.5(3t)"
            },
            {
              "status": "affected",
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            },
            {
              "status": "affected",
              "version": "10.4(6)"
            },
            {
              "status": "affected",
              "version": "10.5(3s)"
            },
            {
              "status": "affected",
              "version": "10.5(3e)"
            },
            {
              "status": "affected",
              "version": "10.5(3o)"
            },
            {
              "status": "affected",
              "version": "10.6(1s)"
            },
            {
              "status": "affected",
              "version": "10.6(2)"
            },
            {
              "status": "affected",
              "version": "10.5(3p)"
            },
            {
              "status": "affected",
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            },
            {
              "status": "affected",
              "version": "10.6(2s)"
            },
            {
              "status": "affected",
              "version": "10.6(3)"
            },
            {
              "status": "affected",
              "version": "10.4(7)"
            },
            {
              "status": "affected",
              "version": "10.5(5)"
            },
            {
              "status": "affected",
              "version": "10.6(2n)"
            },
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              "status": "affected",
              "version": "10.6(3s)"
            }
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        }
      ],
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        {
          "lang": "en",
          "value": "A vulnerability in the Silicon One integration for Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to execute code with\u0026nbsp;root privileges.\r\n\r\nThis 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\u0026nbsp;root privileges. The exploitation of this vulnerability could also cause the S1HAL process to crash, which could cause the device to reload."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "cvssV3_1"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1327",
              "description": "Binding to an Unrestricted IP Address",
              "lang": "en",
              "type": "cwe"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-02T16:13:08.882Z",
        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
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          "name": "cisco-sa-n9k-s1-rce-EH8dEtr",
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        }
      ],
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        "advisory": "cisco-sa-n9k-s1-rce-EH8dEtr",
        "defects": [
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        ],
        "discovery": "EXTERNAL"
      },
      "title": "Cisco Nexus 3000 and 9000 Series Switches Silicon One Hardware Abstraction Layer Remote Code Execution Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
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    "datePublished": "2026-09-02T16:13:08.882Z",
    "dateReserved": "2025-10-08T11:59:15.398Z",
    "dateUpdated": "2026-09-03T03:56:34.679Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-6G5H-4MV8-PRV7

CVE-2026-20212 (GCVE-0-2026-20212)

Tags

Sightings

Nomenclature