FKIE_CVE-2021-39509

Vulnerability from fkie_nvd - Published: 2021-08-24 19:15 - Updated: 2026-06-17 04:03
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
An issue was discovered in D-Link DIR-816 DIR-816A2_FWv1.10CNB05_R1B011D88210 The HTTP request parameter is used in the handler function of /goform/form2userconfig.cgi route, which can construct the user name string to delete the user function. This can lead to command injection through shell metacharacters.
References
cve@mitre.orghttps://github.com/doudoudedi/main-DIR-816_A2_Command-injectionThird Party Advisory
cve@mitre.orghttps://github.com/doudoudedi/main-DIR-816_A2_Command-injection/blob/main/injection.mdExploit, Third Party Advisory
cve@mitre.orghttps://www.dlink.com/en/security-bulletin/Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/doudoudedi/main-DIR-816_A2_Command-injectionThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/doudoudedi/main-DIR-816_A2_Command-injection/blob/main/injection.mdExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.dlink.com/en/security-bulletin/Vendor Advisory
Impacted products
Vendor Product Version
dlink dir-816_firmware 1.10cnb05_r1b011d88210
dlink dir-816 a2
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:dlink:dir-816_firmware:1.10cnb05_r1b011d88210:*:*:*:*:*:*:*",
              "matchCriteriaId": "6494A725-3860-4428-A0F3-076605CAF7F2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:h:dlink:dir-816:a2:*:*:*:*:*:*:*",
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              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in D-Link DIR-816 DIR-816A2_FWv1.10CNB05_R1B011D88210 The HTTP request parameter is used in the handler function of /goform/form2userconfig.cgi route, which can construct the user name string to delete the user function. This can lead to command injection through shell metacharacters."
    },
    {
      "lang": "es",
      "value": "Se ha descubierto un problema en D-Link DIR-816 DIR-816A2_FWv1.10CNB05_R1B011D88210 El par\u00e1metro de solicitud HTTP se utiliza en la funci\u00f3n del manejador de la ruta /goform/form2userconfig.cgi, que puede construir la cadena de nombre de usuario para eliminar la funci\u00f3n de usuario. Esto puede llevar a la inyecci\u00f3n de comandos a trav\u00e9s de metacaracteres del shell"
    }
  ],
  "id": "CVE-2021-39509",
  "lastModified": "2026-06-17T04:03:44.167",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 7.5,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-08-24T19:15:32.967",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/doudoudedi/main-DIR-816_A2_Command-injection"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
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        "Third Party Advisory"
      ],
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    },
    {
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      "tags": [
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    },
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      "tags": [
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      ],
      "url": "https://www.dlink.com/en/security-bulletin/"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-77"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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