Vulnerability Description
The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices does not properly handle the reception of LMP_max_slot with a greater ACL Length after completion of the LMP setup procedure, allowing attackers in radio range to trigger a denial of service (firmware crash) via a crafted LMP packet.
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-2021-34148?
CVE-2021-34148 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 devices does not properly handle the reception of LMP_max_slot with a greater ACL Length after completio...
How severe is CVE-2021-34148?
CVE-2021-34148 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-2021-34148?
Check the references section above for vendor advisories and patch information. Affected products include: Cypress Wireless Internet Connectivity For Embedded Devices, Cypress Cyw20735B1.