Security advisory

{
  "id": "3f117188383de24f28616ac0ddc6e564b0c0ab512ae0bc42b8dbff0b5b75b2e0",
  "url": "https://osv.dev/vulnerability/CVE-2021-28139",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-28139",
    "summary": "The Bluetooth Classic implementation in Espressif ESP-IDF 4.4 and earlier does not properly restrict the Feature Page upon reception of an LMP Feature Response Extended packet, allowing attackers in radio range to trigger arbitrary code execution in ESP32 via a crafted Extended Features bitfield payload.",
    "evidence": "osv:CVE-2021-28139",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-28139",
      "aliases": [
        "CVE-2021-28139"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/espressif/esp-idf",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "c8315e01107c10898947a817d5cf763cdd3f5a4f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:espressif:esp-idf:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "4.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.4-dev",
            "v4.3-beta1",
            "v4.3-dev",
            "v4.2-dev",
            "v4.1-dev",
            "v4.0-dev",
            "v3.3-beta2",
            "v3.3-beta1",
            "v3.2-beta1",
            "v3.3-dev",
            "v3.1-beta1",
            "v3.2-dev",
            "v3.1-dev",
            "v2.1-rc1",
            "v3.0-dev",
            "v2.0-rc1",
            "v1.0",
            "v0.9"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-28139.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:35.806719283Z",
      "provider": "osv",
      "references": [
        "https://dl.packetstormsecurity.net/papers/general/braktooth.pdf",
        "https://www.espressif.com/en/products/socs/esp32",
        "https://github.com/espressif/esp-idf",
        "https://github.com/espressif/esp32-bt-lib"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-28139",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385693,
  "published_at": "2021-09-07T07:15:06.877+00:00"
}