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CVE-2021-20140

Status: ModifiedHigh (8.8)—

An unauthenticated command injection vulnerability exists in the parameters of operation 10 in the controller_server service on Gryphon Tower routers. An unauthenticated remote attacker on the same network can execute commands as root on the device by sending a specially crafted malicious packet to the controller_server service on port 9999.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Gryphonconnect — Gryphon Tower Firmware

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-20140",
  "cveTags": [],
  "metrics": {
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        "type": "Primary",
        "source": "nvd@nist.gov",
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          "accessVector": "ADJACENT_NETWORK",
          "vectorString": "AV:A/AC:L/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
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          "confidentialityImpact": "COMPLETE"
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        "obtainAllPrivilege": false,
        "exploitabilityScore": 6.5,
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          "confidentialityImpact": "HIGH"
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  "affected": [
    {
      "source": "vulnreport@tenable.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "Gryphon Tower router",
          "versions": [
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              "status": "affected",
              "version": "<= 04.0004.12 (Current)"
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  "published": "2021-12-09T16:15:07.880",
  "references": [
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      "url": "https://www.tenable.com/security/research/tra-2021-51",
      "tags": [
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        "Vendor Advisory"
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    },
    {
      "url": "https://www.tenable.com/security/research/tra-2021-51",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An unauthenticated command injection vulnerability exists in the parameters of operation 10 in the controller_server service on Gryphon Tower routers. An unauthenticated remote attacker on the same network can execute commands as root on the device by sending a specially crafted malicious packet to the controller_server service on port 9999."
    },
    {
      "lang": "es",
      "value": "Se presenta una vulnerabilidad de inyección de comandos no autenticada en los parámetros de la operación 10 del servicio controller_server en los routers Gryphon Tower. Un atacante remoto no autenticado en la misma red puede ejecutar comandos como root en el dispositivo mediante el envío de un paquete malicioso especialmente diseñado al servicio controller_server en el puerto 9999"
    }
  ],
  "lastModified": "2026-06-17T03:33:20.450",
  "configurations": [
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  "sourceIdentifier": "vulnreport@tenable.com"
}