Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cypress | Wireless Internet Connectivity For Embedded Devices | <= 2.9.0 |
| Cypress | Cyw20735B1 | - |
References
- https://dl.packetstormsecurity.net/papers/general/braktooth.pdfTechnical DescriptionThird Party Advisory
- https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetootVendor Advisory
- https://dl.packetstormsecurity.net/papers/general/braktooth.pdfTechnical DescriptionThird Party Advisory
- https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetootVendor Advisory
FAQ
What is CVE-2021-34147?
CVE-2021-34147 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 ...
How severe is CVE-2021-34147?
CVE-2021-34147 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-34147?
Check the references section above for vendor advisories and patch information. Affected products include: Cypress Wireless Internet Connectivity For Embedded Devices, Cypress Cyw20735B1.