CVE-2021-34146 json
The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the reception of continuous unsolicited LMP re…
published 2021-09-07 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-20808
- cvss
- 6.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 48%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bluez-firmware Debian 14, Debian 13, Debian 12 1.2-8
debian advisories DEBIAN-CVE-2021-34146
Exploit prediction
0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 6.1 | AV:A/AC:L/Au:N/C:N/I:N/A:C |
References
-
cypress.com
/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices
vendor-advisory
-
dl.packetstormsecurity.net
/papers/general/braktooth.pdf
technical-description, third-party-advisory
Sources
- CVE List CVE-2021-34146
- NVD CVE-2021-34146
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