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CVE-2021-20127

Status: ModifiedHigh (8.1)—

An arbitrary file deletion vulnerability exists in the file delete functionality of the Html5Servlet endpoint of Draytek VigorConnect 1.6.0-B3. This allows an authenticated user to arbitrarily delete files in any location on the target operating system with root privileges.

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)

Draytek — Vigorconnect

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-20127",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:N/I:C/A:C",
          "authentication": "SINGLE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 9.2,
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        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
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        "userInteractionRequired": false
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    "cvssMetricV31": [
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          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "vulnreport@tenable.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "Draytek VigorConnect",
          "versions": [
            {
              "status": "affected",
              "version": "1.6.0-B3"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-10-13T16:15:07.517",
  "references": [
    {
      "url": "https://www.tenable.com/security/research/tra-2021-42",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "source": "vulnreport@tenable.com"
    },
    {
      "url": "https://www.tenable.com/security/research/tra-2021-42",
      "tags": [
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      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
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      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An arbitrary file deletion vulnerability exists in the file delete functionality of the Html5Servlet endpoint of Draytek VigorConnect 1.6.0-B3. This allows an authenticated user to arbitrarily delete files in any location on the target operating system with root privileges."
    },
    {
      "lang": "es",
      "value": "Se presenta una vulnerabilidad de eliminación arbitraria de archivos en la funcionalidad file delete del endpoint Html5Servlet de Draytek VigorConnect versión 1.6.0-B3. Esto permite a un usuario autenticado eliminar arbitrariamente archivos en cualquier ubicación del sistema operativo de destino con privilegios de root"
    }
  ],
  "lastModified": "2026-06-17T03:33:19.150",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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            }
          ],
          "operator": "OR"
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  "sourceIdentifier": "vulnreport@tenable.com"
}