CVE-2021-34147

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.

6.5

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.25%

Vendor Advisory cypress.com

Affected: n/a n/a

References

Link	Tags
https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices	vendor advisory
https://dl.packetstormsecurity.net/papers/general/braktooth.pdf	third party advisory technical description

Frequently Asked Questions

What is the severity of CVE-2021-34147?: CVE-2021-34147 has been scored as a medium severity vulnerability.
How to fix CVE-2021-34147?: To fix CVE-2021-34147, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-34147 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-34147 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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