CVE-2021-34146 — MEDIUM (6.5)

Vulnerability Description

The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service and restart (crash) of the device by flooding it with LMP_AU_Rand packets after the paging procedure.

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

ADJACENT_NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Cypress	Cyw920735Q60Evb-01 Firmware	-
Cypress	Cyw920735Q60Evb-01	-
Cypress	Cyw20735B1 Firmware	-
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-2021-34146?

CVE-2021-34146 is a vulnerability with a CVSS score of 6.5 (MEDIUM). The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denia...

How severe is CVE-2021-34146?

CVE-2021-34146 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-2021-34146?

Check the references section above for vendor advisories and patch information. Affected products include: Cypress Cyw920735Q60Evb-01 Firmware, Cypress Cyw920735Q60Evb-01, Cypress Cyw20735B1 Firmware, Cypress Cyw20735B1.