Vulnerability Details : CVE-2021-34147
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.
Products affected by CVE-2021-34147
- cpe:2.3:o:cypress:wireless_internet_connectivity_for_embedded_devices:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-34147
0.25%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 48 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-34147
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.1
|
MEDIUM | AV:A/AC:L/Au:N/C:N/I:N/A:C |
6.5
|
6.9
|
NIST | |
|
6.5
|
MEDIUM | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
2.8
|
3.6
|
NIST |
References for CVE-2021-34147
-
https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices
Access DeniedVendor Advisory
-
https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
Technical Description;Third Party Advisory
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