The Bluetooth Low Energy (BLE) controller implementation in Espressif ESP-IDF 4.2 and earlier (for ESP32 devices) does not properly restrict the channel map field of the connection request packet on reception, allowing attackers in radio range to cause a denial of service (crash) via a crafted packet.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13594
Reference (s):
- https://asset-group.github.io/cves.html
- https://asset-group.github.io/disclosures/sweyntooth/
- https://github.com/espressif/esp32-bt-lib