CVEvulnerability
CVE-2021-34147
6.5 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2021-09-07
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 6.5 MEDIUM — CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 2.0 ([email protected])
- 6.1 MEDIUM — AV:A/AC:L/Au:N/C:N/I:N/A:C
Description
The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 does not properly handle the reception of a malformed LMP timing accuracy response followed by multiple reconnections to the link slave, allowing attackers to exhaust device BT resources and eventually trigger a crash via multiple attempts of sending a crafted LMP timing accuracy response followed by a sudden reconnection with a random BDAddress.
Affected configurations
• cypress wireless internet connectivity for embedded devices (<= 2.9.0)
References
- https://dl.packetstormsecurity.net/papers/general/braktooth.pdf Technical Description, Third Party Advisory
- https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices Vendor Advisory
- https://dl.packetstormsecurity.net/papers/general/braktooth.pdf Technical Description, Third Party Advisory
- https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices Vendor Advisory