{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:espressif:esp-idf:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.4"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "c8315e01107c10898947a817d5cf763cdd3f5a4f"
            }
          ],
          "repo": "https://github.com/espressif/esp-idf",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {},
  "details": "The Bluetooth Classic implementation in Espressif ESP-IDF 4.4 and earlier does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service (crash) in ESP32 by flooding the target device with LMP Feature Response data.",
  "id": "CVE-2021-28135",
  "modified": "2026-07-08T05:39:29.949612773Z",
  "published": "2021-09-07T06:15:07.230Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://dl.packetstormsecurity.net/papers/general/braktooth.pdf"
    },
    {
      "type": "WEB",
      "url": "https://www.espressif.com/en/products/socs/esp32"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/espressif/esp-idf"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/espressif/esp32-bt-lib"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}