Vulnerability-Lookup

FKIE_CVE-2021-20696

Vulnerability from fkie_nvd - Published: 2021-04-26 01:15 - Updated: 2026-06-17 03:34

Severity

8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

DAP-1880AC firmware version 1.21 and earlier allows a remote authenticated attacker to execute arbitrary OS commands by sending a specially crafted request to a specific CGI program.

References

URL	Tags
vultures@jpcert.or.jp	https://jvn.jp/en/vu/JVNVU92898656/index.html	Third Party Advisory
vultures@jpcert.or.jp	https://www.dlink-jp.com/support/release/jvnvu92898656_dap-1880ac.html	Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://jvn.jp/en/vu/JVNVU92898656/index.html	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.dlink-jp.com/support/release/jvnvu92898656_dap-1880ac.html	Vendor Advisory

Impacted products

	Vendor	Product	Version
	dlink	dap-1880ac_firmware	*
	dlink	dap-1880ac	-

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "DAP-1880AC",
          "vendor": "D-Link Japan K.K.",
          "versions": [
            {
              "status": "affected",
              "version": "firmware version 1.21 and earlier"
            }
          ]
        }
      ],
      "source": "vultures@jpcert.or.jp"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:dlink:dap-1880ac_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "4A34EE04-1B2C-4DE7-8FC6-9F9AE972328F",
              "versionEndIncluding": "1.21",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:dlink:dap-1880ac:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "AB2B9717-DD29-495D-B2B6-6920E972EB88",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "DAP-1880AC firmware version 1.21 and earlier allows a remote authenticated attacker to execute arbitrary OS commands by sending a specially crafted request to a specific CGI program."
    },
    {
      "lang": "es",
      "value": "Un DAP-1880AC versiones de firmware 1.21 y anteriores, permite a un atacante autenticado remoto ejecutar comandos arbitrarios del Sistema Operativo mediante el envio de una petici\u00f3n especialmente dise\u00f1ada a un programa CGI espec\u00edfico"
    }
  ],
  "id": "CVE-2021-20696",
  "lastModified": "2026-06-17T03:34:16.367",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "SINGLE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 9.0,
          "confidentialityImpact": "COMPLETE",
          "integrityImpact": "COMPLETE",
          "vectorString": "AV:N/AC:L/Au:S/C:C/I:C/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 8.0,
        "impactScore": 10.0,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-04-26T01:15:07.893",
  "references": [
    {
      "source": "vultures@jpcert.or.jp",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://jvn.jp/en/vu/JVNVU92898656/index.html"
    },
    {
      "source": "vultures@jpcert.or.jp",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.dlink-jp.com/support/release/jvnvu92898656_dap-1880ac.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://jvn.jp/en/vu/JVNVU92898656/index.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.dlink-jp.com/support/release/jvnvu92898656_dap-1880ac.html"
    }
  ],
  "sourceIdentifier": "vultures@jpcert.or.jp",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-20696 (GCVE-0-2021-20696)

Vulnerability from cvelistv5 – Published: 2021-04-26 00:20 – Updated: 2024-08-03 17:45

Summary

DAP-1880AC firmware version 1.21 and earlier allows a remote authenticated attacker to execute arbitrary OS commands by sending a specially crafted request to a specific CGI program.

Severity

No CVSS data available.

CWE

OS Command Injection

Assigner

jpcert jpcert root

References

2 references

URL	Tags
https://www.dlink-jp.com/support/release/jvnvu928…	x_refsource_MISC
https://jvn.jp/en/vu/JVNVU92898656/index.html	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
D-Link Japan K.K.	DAP-1880AC	Affected: firmware version 1.21 and earlier

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T17:45:45.503Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.dlink-jp.com/support/release/jvnvu92898656_dap-1880ac.html"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://jvn.jp/en/vu/JVNVU92898656/index.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "DAP-1880AC",
          "vendor": "D-Link Japan K.K.",
          "versions": [
            {
              "status": "affected",
              "version": "firmware version 1.21 and earlier"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "DAP-1880AC firmware version 1.21 and earlier allows a remote authenticated attacker to execute arbitrary OS commands by sending a specially crafted request to a specific CGI program."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "OS Command Injection",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-04-26T00:20:42.000Z",
        "orgId": "ede6fdc4-6654-4307-a26d-3331c018e2ce",
        "shortName": "jpcert"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.dlink-jp.com/support/release/jvnvu92898656_dap-1880ac.html"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://jvn.jp/en/vu/JVNVU92898656/index.html"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "vultures@jpcert.or.jp",
          "ID": "CVE-2021-20696",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "DAP-1880AC",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "firmware version 1.21 and earlier"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "D-Link Japan K.K."
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "DAP-1880AC firmware version 1.21 and earlier allows a remote authenticated attacker to execute arbitrary OS commands by sending a specially crafted request to a specific CGI program."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "OS Command Injection"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://www.dlink-jp.com/support/release/jvnvu92898656_dap-1880ac.html",
              "refsource": "MISC",
              "url": "https://www.dlink-jp.com/support/release/jvnvu92898656_dap-1880ac.html"
            },
            {
              "name": "https://jvn.jp/en/vu/JVNVU92898656/index.html",
              "refsource": "MISC",
              "url": "https://jvn.jp/en/vu/JVNVU92898656/index.html"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ede6fdc4-6654-4307-a26d-3331c018e2ce",
    "assignerShortName": "jpcert",
    "cveId": "CVE-2021-20696",
    "datePublished": "2021-04-26T00:20:42.000Z",
    "dateReserved": "2020-12-17T00:00:00.000Z",
    "dateUpdated": "2024-08-03T17:45:45.503Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.