Denial of Service Vulnerability in Bluetooth Implementation on Cypress Devices
CVE-2021-34148

6.5MEDIUM

Key Information:

Vendor

Cypress

Status
Wireless Internet Connectivity For Embedded Devices
Vendor
CVE Published:
7 September 2021

What is CVE-2021-34148?

The Bluetooth Classic implementation within the Cypress WICED BT stack for CYW20735B1 devices is vulnerable due to improper handling of LMP_max_slot messages with a larger ACL Length after the LMP setup. Exploiting this vulnerability allows attackers within radio range to trigger a denial of service condition by sending a crafted LMP packet, potentially causing the firmware to crash.

References

https://www.cypress.com/documentation/datasheets/cyw20735...
x_refsource_MISC
https://dl.packetstormsecurity.net/papers/general/braktoo...
x_refsource_MISC

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2021-34148 : Denial of Service Vulnerability in Bluetooth Implementation on Cypress Devices