GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2021-23906 (GCVE-0-2021-23906)

Vulnerability from cvelistv5 – Published: 2021-05-13 18:56 – Updated: 2024-08-03 19:14
VLAI
Summary
An issue was discovered in the Headunit NTG6 in the MBUX Infotainment System on Mercedes-Benz vehicles through 2021. A Message Length is not checked in the HiQnet Protocol, leading to remote code execution.
CWE
  • n/a
Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T19:14:09.454Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://media.daimler.com/marsMediaSite/en/instance/ko.xhtml?oid=49946866"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://keenlab.tencent.com/en/2021/05/12/Tencent-Security-Keen-Lab-Experimental-Security-Assessment-on-Mercedes-Benz-Cars/"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final.pdf"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "An issue was discovered in the Headunit NTG6 in the MBUX Infotainment System on Mercedes-Benz vehicles through 2021. A Message Length is not checked in the HiQnet Protocol, leading to remote code execution."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "PHYSICAL",
            "availabilityImpact": "NONE",
            "baseScore": 1.8,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AC:H/AV:P/A:N/C:N/I:L/PR:N/S:U/UI:R",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-05-13T18:56:32.000Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://media.daimler.com/marsMediaSite/en/instance/ko.xhtml?oid=49946866"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://keenlab.tencent.com/en/2021/05/12/Tencent-Security-Keen-Lab-Experimental-Security-Assessment-on-Mercedes-Benz-Cars/"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final.pdf"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2021-23906",
          "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": "An issue was discovered in the Headunit NTG6 in the MBUX Infotainment System on Mercedes-Benz vehicles through 2021. A Message Length is not checked in the HiQnet Protocol, leading to remote code execution."
            }
          ]
        },
        "impact": {
          "cvss": {
            "attackComplexity": "HIGH",
            "attackVector": "PHYSICAL",
            "availabilityImpact": "NONE",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AC:H/AV:P/A:N/C:N/I:L/PR:N/S:U/UI:R",
            "version": "3.1"
          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "n/a"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://media.daimler.com/marsMediaSite/en/instance/ko.xhtml?oid=49946866",
              "refsource": "MISC",
              "url": "https://media.daimler.com/marsMediaSite/en/instance/ko.xhtml?oid=49946866"
            },
            {
              "name": "https://keenlab.tencent.com/en/2021/05/12/Tencent-Security-Keen-Lab-Experimental-Security-Assessment-on-Mercedes-Benz-Cars/",
              "refsource": "MISC",
              "url": "https://keenlab.tencent.com/en/2021/05/12/Tencent-Security-Keen-Lab-Experimental-Security-Assessment-on-Mercedes-Benz-Cars/"
            },
            {
              "name": "https://keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final.pdf",
              "refsource": "MISC",
              "url": "https://keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final.pdf"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2021-23906",
    "datePublished": "2021-05-13T18:56:32.000Z",
    "dateReserved": "2021-01-12T00:00:00.000Z",
    "dateUpdated": "2024-08-03T19:14:09.454Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-23906",
      "date": "2026-09-20",
      "epss": "0.00804",
      "percentile": "0.55172"
    },
    "fkie_nvd": {
      "configurations": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:mercedes-benz:mercedes-benz_user_experience:*:*:*:*:*:*:*:*",
                  "matchCriteriaId": "D5F4C437-A793-4B21-9C39-69DF10CA823D",
                  "versionEndIncluding": "2021",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            },
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:h:mercedes-benz:a_220:-:*:*:*:*:*:*:*",
                  "matchCriteriaId": "00C6FB3F-99E8-4F72-8B40-93AB5244D3A3",
                  "vulnerable": false
                },
                {
                  "criteria": "cpe:2.3:h:mercedes-benz:a_220_4matic:-:*:*:*:*:*:*:*",
                  "matchCriteriaId": "6AE91DA7-054C-43D0-9E4D-6385375A5739",
                  "vulnerable": false
                },
                {
                  "criteria": "cpe:2.3:h:mercedes-benz:e_350:-:*:*:*:*:*:*:*",
                  "matchCriteriaId": "D7F9C8E2-57A0-4D2D-8211-33104006B92B",
                  "vulnerable": false
                },
                {
                  "criteria": "cpe:2.3:h:mercedes-benz:e_350_4matic:-:*:*:*:*:*:*:*",
                  "matchCriteriaId": "8EC39015-8D7D-4B64-9EBF-C51576DC97A9",
                  "vulnerable": false
                },
                {
                  "criteria": "cpe:2.3:h:mercedes-benz:eqc:-:*:*:*:*:*:*:*",
                  "matchCriteriaId": "435101DE-3319-4633-8FCC-03CC247F091D",
                  "vulnerable": false
                },
                {
                  "criteria": "cpe:2.3:h:mercedes-benz:gle_350:-:*:*:*:*:*:*:*",
                  "matchCriteriaId": "12F309D8-C0F6-46A3-9B9E-B3C62EAF0230",
                  "vulnerable": false
                },
                {
                  "criteria": "cpe:2.3:h:mercedes-benz:gle_350_4matic:-:*:*:*:*:*:*:*",
                  "matchCriteriaId": "53E65192-1977-44E6-AF77-370CAB4AC3BB",
                  "vulnerable": false
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ],
          "operator": "AND"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "An issue was discovered in the Headunit NTG6 in the MBUX Infotainment System on Mercedes-Benz vehicles through 2021. A Message Length is not checked in the HiQnet Protocol, leading to remote code execution."
        },
        {
          "lang": "es",
          "value": "Se detect\u00f3 un problema en la unidad principal NTG6 del sistema de infoentretenimiento MBUX en los veh\u00edculos Mercedes-Benz hasta 2021. No se comprueba la longitud de un mensaje en el protocolo HiQnet, lo que lleva a la ejecuci\u00f3n remota de c\u00f3digo"
        }
      ],
      "id": "CVE-2021-23906",
      "lastModified": "2024-11-21T05:52:02.053",
      "metrics": {
        "cvssMetricV2": [
          {
            "acInsufInfo": false,
            "baseSeverity": "LOW",
            "cvssData": {
              "accessComplexity": "LOW",
              "accessVector": "LOCAL",
              "authentication": "NONE",
              "availabilityImpact": "NONE",
              "baseScore": 2.1,
              "confidentialityImpact": "PARTIAL",
              "integrityImpact": "NONE",
              "vectorString": "AV:L/AC:L/Au:N/C:P/I:N/A:N",
              "version": "2.0"
            },
            "exploitabilityScore": 3.9,
            "impactScore": 2.9,
            "obtainAllPrivilege": false,
            "obtainOtherPrivilege": false,
            "obtainUserPrivilege": false,
            "source": "nvd@nist.gov",
            "type": "Primary",
            "userInteractionRequired": false
          }
        ],
        "cvssMetricV31": [
          {
            "cvssData": {
              "attackComplexity": "HIGH",
              "attackVector": "PHYSICAL",
              "availabilityImpact": "NONE",
              "baseScore": 1.8,
              "baseSeverity": "LOW",
              "confidentialityImpact": "NONE",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N",
              "version": "3.1"
            },
            "exploitabilityScore": 0.4,
            "impactScore": 1.4,
            "source": "cve@mitre.org",
            "type": "Secondary"
          },
          {
            "cvssData": {
              "attackComplexity": "LOW",
              "attackVector": "PHYSICAL",
              "availabilityImpact": "HIGH",
              "baseScore": 6.8,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            },
            "exploitabilityScore": 0.9,
            "impactScore": 5.9,
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      },
      "published": "2021-05-13T19:15:07.753",
      "references": [
        {
          "source": "cve@mitre.org",
          "tags": [
            "Third Party Advisory"
          ],
          "url": "https://keenlab.tencent.com/en/2021/05/12/Tencent-Security-Keen-Lab-Experimental-Security-Assessment-on-Mercedes-Benz-Cars/"
        },
        {
          "source": "cve@mitre.org",
          "tags": [
            "Exploit",
            "Third Party Advisory"
          ],
          "url": "https://keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final.pdf"
        },
        {
          "source": "cve@mitre.org",
          "tags": [
            "Third Party Advisory"
          ],
          "url": "https://media.daimler.com/marsMediaSite/en/instance/ko.xhtml?oid=49946866"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Third Party Advisory"
          ],
          "url": "https://keenlab.tencent.com/en/2021/05/12/Tencent-Security-Keen-Lab-Experimental-Security-Assessment-on-Mercedes-Benz-Cars/"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Exploit",
            "Third Party Advisory"
          ],
          "url": "https://keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final.pdf"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Third Party Advisory"
          ],
          "url": "https://media.daimler.com/marsMediaSite/en/instance/ko.xhtml?oid=49946866"
        }
      ],
      "sourceIdentifier": "cve@mitre.org",
      "vulnStatus": "Modified",
      "weaknesses": [
        {
          "description": [
            {
              "lang": "en",
              "value": "CWE-20"
            }
          ],
          "source": "nvd@nist.gov",
          "type": "Primary"
        }
      ]
    },
    "nvd": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:mercedes-benz:mercedes-benz_user_experience:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "D5F4C437-A793-4B21-9C39-69DF10CA823D",
                    "versionEndIncluding": "2021",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:mercedes-benz:a_220:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "00C6FB3F-99E8-4F72-8B40-93AB5244D3A3",
                    "vulnerable": false
                  },
                  {
                    "criteria": "cpe:2.3:h:mercedes-benz:a_220_4matic:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "6AE91DA7-054C-43D0-9E4D-6385375A5739",
                    "vulnerable": false
                  },
                  {
                    "criteria": "cpe:2.3:h:mercedes-benz:e_350:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "D7F9C8E2-57A0-4D2D-8211-33104006B92B",
                    "vulnerable": false
                  },
                  {
                    "criteria": "cpe:2.3:h:mercedes-benz:e_350_4matic:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "8EC39015-8D7D-4B64-9EBF-C51576DC97A9",
                    "vulnerable": false
                  },
                  {
                    "criteria": "cpe:2.3:h:mercedes-benz:eqc:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "435101DE-3319-4633-8FCC-03CC247F091D",
                    "vulnerable": false
                  },
                  {
                    "criteria": "cpe:2.3:h:mercedes-benz:gle_350:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "12F309D8-C0F6-46A3-9B9E-B3C62EAF0230",
                    "vulnerable": false
                  },
                  {
                    "criteria": "cpe:2.3:h:mercedes-benz:gle_350_4matic:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "53E65192-1977-44E6-AF77-370CAB4AC3BB",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "An issue was discovered in the Headunit NTG6 in the MBUX Infotainment System on Mercedes-Benz vehicles through 2021. A Message Length is not checked in the HiQnet Protocol, leading to remote code execution."
          },
          {
            "lang": "es",
            "value": "Se detect\u00f3 un problema en la unidad principal NTG6 del sistema de infoentretenimiento MBUX en los veh\u00edculos Mercedes-Benz hasta 2021. No se comprueba la longitud de un mensaje en el protocolo HiQnet, lo que lleva a la ejecuci\u00f3n remota de c\u00f3digo"
          }
        ],
        "id": "CVE-2021-23906",
        "lastModified": "2024-11-21T05:52:02.053",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "LOW",
              "cvssData": {
                "accessComplexity": "LOW",
                "accessVector": "LOCAL",
                "authentication": "NONE",
                "availabilityImpact": "NONE",
                "baseScore": 2.1,
                "confidentialityImpact": "PARTIAL",
                "integrityImpact": "NONE",
                "vectorString": "AV:L/AC:L/Au:N/C:P/I:N/A:N",
                "version": "2.0"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 2.9,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
              "userInteractionRequired": false
            }
          ],
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "PHYSICAL",
                "availabilityImpact": "NONE",
                "baseScore": 1.8,
                "baseSeverity": "LOW",
                "confidentialityImpact": "NONE",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 0.4,
              "impactScore": 1.4,
              "source": "cve@mitre.org",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "PHYSICAL",
                "availabilityImpact": "HIGH",
                "baseScore": 6.8,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 0.9,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2021-05-13T19:15:07.753",
        "references": [
          {
            "source": "cve@mitre.org",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://keenlab.tencent.com/en/2021/05/12/Tencent-Security-Keen-Lab-Experimental-Security-Assessment-on-Mercedes-Benz-Cars/"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Exploit",
              "Third Party Advisory"
            ],
            "url": "https://keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final.pdf"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://media.daimler.com/marsMediaSite/en/instance/ko.xhtml?oid=49946866"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://keenlab.tencent.com/en/2021/05/12/Tencent-Security-Keen-Lab-Experimental-Security-Assessment-on-Mercedes-Benz-Cars/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Exploit",
              "Third Party Advisory"
            ],
            "url": "https://keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final.pdf"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://media.daimler.com/marsMediaSite/en/instance/ko.xhtml?oid=49946866"
          }
        ],
        "sourceIdentifier": "cve@mitre.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-20"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2026-03-27T14:45:10+00:00",
      "cve": "CVE-2021-23906",
      "id": "CVE-2021-23906",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "CVE-2021-23906",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-23906.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

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.

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.

Loading…

Detection rules are retrieved from Rulezet.

Loading…

Loading…

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.


Loading…