Vulnerability-Lookup

FKIE_CVE-2021-34571

Vulnerability from fkie_nvd - Published: 2021-09-16 13:15 - Updated: 2026-06-17 03:56

Severity

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

Summary

Multiple Wireless M-Bus devices by Enbra use Hard-coded Credentials in Security mode 5 without an option to change the encryption key. An adversary can learn all information that is available in Enbra EWM.

References

	URL	Tags
	info@cert.vde.com	https://www.fit.vutbr.cz/~polcak/CVE-2021-34571.en	Third Party Advisory
	af854a3a-2127-422b-91ae-364da2661108	https://www.fit.vutbr.cz/~polcak/CVE-2021-34571.en	Third Party Advisory

Impacted products

	Vendor	Product	Version
	enbra	ewm	1.7.29

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "AT-WMBUS-16-2",
          "vendor": "Enbra",
          "versions": [
            {
              "status": "unknown",
              "version": "all"
            }
          ]
        },
        {
          "product": "ER-AM DN 15",
          "vendor": "Enbra",
          "versions": [
            {
              "status": "unknown",
              "version": "ER-AM DN 15/SV all"
            },
            {
              "status": "unknown",
              "version": "ER-AM DN 15/TV all"
            }
          ]
        },
        {
          "product": "EWM 1.7.29",
          "vendor": "Enbra",
          "versions": [
            {
              "status": "affected",
              "version": "03.11.2019"
            }
          ]
        }
      ],
      "source": "info@cert.vde.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:enbra:ewm:1.7.29:*:*:*:*:*:*:*",
              "matchCriteriaId": "C983990C-D1DE-42C2-B6A2-8D9BD0B5A4FF",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Multiple Wireless M-Bus devices by Enbra use Hard-coded Credentials in Security mode 5 without an option to change the encryption key. An adversary can learn all information that is available in Enbra EWM."
    },
    {
      "lang": "es",
      "value": "M\u00faltiples dispositivos M-Bus inal\u00e1mbricos de Enbra, usan Credenciales Embebidas en Security mode 5 sin una opci\u00f3n para cambiar la clave de cifrado. Un adversario puede aprender toda la informaci\u00f3n disponible en Enbra EWM"
    }
  ],
  "id": "CVE-2021-34571",
  "lastModified": "2026-06-17T03:56:09.063",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "LOW",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "ADJACENT_NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 2.9,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "NONE",
          "vectorString": "AV:A/AC:M/Au:N/C:P/I:N/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 5.5,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "info@cert.vde.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-09-16T13:15:14.200",
  "references": [
    {
      "source": "info@cert.vde.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.fit.vutbr.cz/~polcak/CVE-2021-34571.en"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.fit.vutbr.cz/~polcak/CVE-2021-34571.en"
    }
  ],
  "sourceIdentifier": "info@cert.vde.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-798"
        }
      ],
      "source": "info@cert.vde.com",
      "type": "Secondary"
    }
  ]
}

CVE-2021-34571 (GCVE-0-2021-34571)

Vulnerability from cvelistv5 – Published: 2021-09-16 12:20 – Updated: 2024-09-16 16:13

Title

Hard-coded Credentials in Enbra Wireless M-Bus devices

Summary

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CWE

CWE-798 - Use of Hard-coded Credentials

Assigner

CERTVDE icscert root

References

1 reference

URL	Tags
https://www.fit.vutbr.cz/~polcak/CVE-2021-34571.en	x_refsource_CONFIRM

Impacted products

3 products

Vendor	Product	Version
Enbra	AT-WMBUS-16-2	Unknown: all
Enbra	ER-AM DN 15	Unknown: ER-AM DN 15/SV all Unknown: ER-AM DN 15/TV all
Enbra	EWM 1.7.29	Affected: 03.11.2019

Date Public

2021-08-31 00:00

Credits

Libor POLČÁK reported to CERT@VDE

Show details on NVD website

JSON

To clipboard

{
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          "dateUpdated": "2024-08-04T00:12:50.369Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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              "x_transferred"
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            "url": "https://www.fit.vutbr.cz/~polcak/CVE-2021-34571.en"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "AT-WMBUS-16-2",
          "vendor": "Enbra",
          "versions": [
            {
              "status": "unknown",
              "version": "all"
            }
          ]
        },
        {
          "product": "ER-AM DN 15",
          "vendor": "Enbra",
          "versions": [
            {
              "status": "unknown",
              "version": "ER-AM DN 15/SV all"
            },
            {
              "status": "unknown",
              "version": "ER-AM DN 15/TV all"
            }
          ]
        },
        {
          "product": "EWM 1.7.29",
          "vendor": "Enbra",
          "versions": [
            {
              "status": "affected",
              "version": "03.11.2019"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Libor POL\u010c\u00c1K reported to CERT@VDE"
        }
      ],
      "datePublic": "2021-08-31T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Multiple Wireless M-Bus devices by Enbra use Hard-coded Credentials in Security mode 5 without an option to change the encryption key. An adversary can learn all information that is available in Enbra EWM."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
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            "confidentialityImpact": "HIGH",
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            "privilegesRequired": "NONE",
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            "userInteraction": "NONE",
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            "version": "3.1"
          }
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      "problemTypes": [
        {
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          ]
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      ],
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      },
      "references": [
        {
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          ],
          "url": "https://www.fit.vutbr.cz/~polcak/CVE-2021-34571.en"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Hard-coded Credentials in Enbra Wireless M-Bus devices",
      "x_generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "info@cert.vde.com",
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          "STATE": "PUBLIC",
          "TITLE": "Hard-coded Credentials in Enbra Wireless M-Bus devices"
        },
        "affects": {
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              {
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                    {
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                      "version": {
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                          {
                            "version_affected": "?",
                            "version_value": "all"
                          }
                        ]
                      }
                    },
                    {
                      "product_name": "ER-AM DN 15",
                      "version": {
                        "version_data": [
                          {
                            "version_affected": "?",
                            "version_name": "ER-AM DN 15/SV",
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                            "version_name": "ER-AM DN 15/TV",
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                      }
                    },
                    {
                      "product_name": "EWM 1.7.29",
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    "state": "PUBLISHED"
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}

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.