Vulnerability-Lookup

CNVD-2021-44915

Vulnerability from cnvd - Published: 2021-06-24

Title

D-Link DIR-2640-US账户密码明文存储漏洞

Description

D-Link DIR-2640-US是一款网络路由器设备。 D-Link DIR-2640-US存在安全漏洞，攻击者可利用漏洞通过串行端口轻松登录到目标路由器并获得root权限。

Severity

高

Patch Name

D-Link DIR-2640-US账户密码明文存储漏洞的补丁

Patch Description

D-Link DIR-2640-US是一款网络路由器设备。 D-Link DIR-2640-US存在安全漏洞，攻击者可利用漏洞通过串行端口轻松登录到目标路由器并获得root权限。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

用户可参考如下厂商提供的安全补丁以修复该漏洞： https://www.dlink.com/en/security-bulletin/

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-34204

Impacted products

Name
D-Link DIR-2640-US 1.01B04

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-34204"
    }
  },
  "description": "D-Link DIR-2640-US\u662f\u4e00\u6b3e\u7f51\u7edc\u8def\u7531\u5668\u8bbe\u5907\u3002\n\nD-Link DIR-2640-US\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u6f0f\u6d1e\u901a\u8fc7\u4e32\u884c\u7aef\u53e3\u8f7b\u677e\u767b\u5f55\u5230\u76ee\u6807\u8def\u7531\u5668\u5e76\u83b7\u5f97root\u6743\u9650\u3002",
  "formalWay": "\u7528\u6237\u53ef\u53c2\u8003\u5982\u4e0b\u5382\u5546\u63d0\u4f9b\u7684\u5b89\u5168\u8865\u4e01\u4ee5\u4fee\u590d\u8be5\u6f0f\u6d1e\uff1a\r\nhttps://www.dlink.com/en/security-bulletin/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-44915",
  "openTime": "2021-06-24",
  "patchDescription": "D-Link DIR-2640-US\u662f\u4e00\u6b3e\u7f51\u7edc\u8def\u7531\u5668\u8bbe\u5907\u3002\r\n\r\nD-Link DIR-2640-US\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u6f0f\u6d1e\u901a\u8fc7\u4e32\u884c\u7aef\u53e3\u8f7b\u677e\u767b\u5f55\u5230\u76ee\u6807\u8def\u7531\u5668\u5e76\u83b7\u5f97root\u6743\u9650\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "D-Link DIR-2640-US\u8d26\u6237\u5bc6\u7801\u660e\u6587\u5b58\u50a8\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "D-Link DIR-2640-US 1.01B04"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-34204",
  "serverity": "\u9ad8",
  "submitTime": "2021-06-18",
  "title": "D-Link DIR-2640-US\u8d26\u6237\u5bc6\u7801\u660e\u6587\u5b58\u50a8\u6f0f\u6d1e"
}

CVE-2021-34204 (GCVE-0-2021-34204)

Vulnerability from cvelistv5 – Published: 2021-06-16 19:55 – Updated: 2026-07-09 00:13

Summary

D-Link DIR-2640-US 1.01B04 is affected by Insufficiently Protected Credentials. D-Link AC2600(DIR-2640) stores the device system account password in plain text. It does not use linux user management. In addition, the passwords of all devices are the same, and they cannot be modified by normal users. An attacker can easily log in to the target router through the serial port and obtain root privileges.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root Scorecard

References

2 references

URL	Tags
https://www.dlink.com/en/security-bulletin/
https://github.com/liyansong2018/CVE/tree/main/20…

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-07-09T00:13:57.355Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.dlink.com/en/security-bulletin/"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34204"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "D-Link DIR-2640-US 1.01B04 is affected by Insufficiently Protected Credentials. D-Link AC2600(DIR-2640) stores the device system account password in plain text. It does not use linux user management. In addition, the passwords of all devices are the same, and they cannot be modified by normal users. An attacker can easily log in to the target router through the serial port and obtain root privileges."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-05T15:45:18.869Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://www.dlink.com/en/security-bulletin/"
        },
        {
          "url": "https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34204"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2021-34204",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "n/a",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "n/a"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "D-Link DIR-2640-US 1.01B04 is affected by Insufficiently Protected Credentials. D-Link AC2600(DIR-2640) stores the device system account password in plain text. It does not use linux user management. In addition, the passwords of all devices are the same, and they cannot be modified by normal users. An attacker can easily log in to the target router through the serial port and obtain root privileges."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "n/a"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "http://d-link.com",
              "refsource": "MISC",
              "url": "http://d-link.com"
            },
            {
              "name": "https://www.dlink.com/en/security-bulletin/",
              "refsource": "MISC",
              "url": "https://www.dlink.com/en/security-bulletin/"
            },
            {
              "name": "http://dir-2640-us.com",
              "refsource": "MISC",
              "url": "http://dir-2640-us.com"
            },
            {
              "name": "https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34204",
              "refsource": "MISC",
              "url": "https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34204"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2021-34204",
    "datePublished": "2021-06-16T19:55:40.000Z",
    "dateReserved": "2021-06-07T00:00:00.000Z",
    "dateUpdated": "2026-07-09T00:13:57.355Z",
    "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.

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.

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CNVD-2021-44915

CVE-2021-34204 (GCVE-0-2021-34204)

Tags

Sightings

Nomenclature

Related by attack behaviour