CVE-2021-3329 (GCVE-0-2021-3329)

Vulnerability from cvelistv5 – Published: 2023-02-26 00:00 – Updated: 2025-03-11 15:25
VLAI
Title
DOS: Incorrect handling of the initial HCI ACL_MTU handshake packet leads to crash of bluetooth host layer
Summary
Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack
Severity
9.6 (Critical)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-11 15:25 UTC
CWE
  • CWE-703 - Improper Check or Handling of Exceptional Conditions (CWE-703)
Assigner
zephyr CNA under the mitre root
CNA scorecard B 77/100 over 175 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
zephyrproject-rtos zephyr Affected: unspecified , ≤ v2.4 (custom)
guessed Create a notification for this product.
Date Public
2023-02-25 00:00
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T16:53:17.491Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-117"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-3329",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-03-11T15:25:34.489205Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-03-11T15:25:38.906Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "zephyr",
          "vendor": "zephyrproject-rtos",
          "versions": [
            {
              "lessThanOrEqual": "v2.4",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "datePublic": "2023-02-25T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.6,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "LOW",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-703",
              "description": "Improper Check or Handling of Exceptional Conditions (CWE-703)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-02-26T00:00:00.000Z",
        "orgId": "e2e69745-5e70-4e92-8431-deb5529a81ad",
        "shortName": "zephyr"
      },
      "references": [
        {
          "url": "https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-117"
        }
      ],
      "source": {
        "defect": [
          "https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-117"
        ]
      },
      "title": "DOS: Incorrect handling of the initial HCI ACL_MTU handshake packet leads to crash of bluetooth host layer"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "e2e69745-5e70-4e92-8431-deb5529a81ad",
    "assignerShortName": "zephyr",
    "cveId": "CVE-2021-3329",
    "datePublished": "2023-02-26T00:00:00.000Z",
    "dateReserved": "2021-01-27T00:00:00.000Z",
    "dateUpdated": "2025-03-11T15:25:38.906Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-3329",
      "date": "2026-10-17",
      "epss": "0.00616",
      "percentile": "0.48478"
    },
    "nvd": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:zephyrproject:zephyr:2.4.0:-:*:*:*:*:*:*",
                    "matchCriteriaId": "BA268A40-88CF-4655-9B60-97C5C565F04F",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:zephyrproject:zephyr:2.4.0:rc1:*:*:*:*:*:*",
                    "matchCriteriaId": "3F9BFD24-E6AF-476B-AE11-F28C734971E4",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:zephyrproject:zephyr:2.4.0:rc2:*:*:*:*:*:*",
                    "matchCriteriaId": "35CCD91E-311C-4D96-B4FD-590D84F1D4D7",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:zephyrproject:zephyr:2.4.0:rc3:*:*:*:*:*:*",
                    "matchCriteriaId": "7E118B3F-40CA-474F-816C-15827DF29FA5",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack"
          }
        ],
        "id": "CVE-2021-3329",
        "lastModified": "2024-11-21T06:21:18.527",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "ADJACENT_NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.6,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "LOW",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 6.0,
              "source": "vulnerabilities@zephyrproject.org",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "ADJACENT_NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 6.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2023-02-26T07:15:10.287",
        "references": [
          {
            "source": "vulnerabilities@zephyrproject.org",
            "tags": [
              "Exploit",
              "Issue Tracking",
              "Vendor Advisory"
            ],
            "url": "https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-117"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Exploit",
              "Issue Tracking",
              "Vendor Advisory"
            ],
            "url": "https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-117"
          }
        ],
        "sourceIdentifier": "vulnerabilities@zephyrproject.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-703"
              }
            ],
            "source": "vulnerabilities@zephyrproject.org",
            "type": "Secondary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-665"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2025-05-29T03:37:53+00:00",
      "cve": "CVE-2021-3329",
      "id": "CVE-2021-3329",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "DOS: Incorrect handling of the initial HCI ACL_MTU handshake packet leads to crash of bluetooth host layer",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-3329.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2024-08-03T16:53:17.491Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-117"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2021-3329",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-03-11T15:25:34.489205Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-03-11T15:24:56.317Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "zephyr",
              "vendor": "zephyrproject-rtos",
              "versions": [
                {
                  "lessThanOrEqual": "v2.4",
                  "status": "affected",
                  "version": "unspecified",
                  "versionType": "custom"
                }
              ]
            }
          ],
          "datePublic": "2023-02-25T00:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "value": "Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "ADJACENT_NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.6,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "LOW",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-703",
                  "description": "Improper Check or Handling of Exceptional Conditions (CWE-703)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2023-02-26T00:00:00.000Z",
            "orgId": "e2e69745-5e70-4e92-8431-deb5529a81ad",
            "shortName": "zephyr"
          },
          "references": [
            {
              "url": "https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-117"
            }
          ],
          "source": {
            "defect": [
              "https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-117"
            ]
          },
          "title": "DOS: Incorrect handling of the initial HCI ACL_MTU handshake packet leads to crash of bluetooth host layer"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "e2e69745-5e70-4e92-8431-deb5529a81ad",
        "assignerShortName": "zephyr",
        "cveId": "CVE-2021-3329",
        "datePublished": "2023-02-26T00:00:00.000Z",
        "dateReserved": "2021-01-27T00:00:00.000Z",
        "dateUpdated": "2025-03-11T15:25:38.906Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    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.