CVE-2021-34146

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
6.5 MEDIUM
ADJACENT_NETWORK
LOW
NONE
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
mitreCNA
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CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 48%
VendorProductVersion
cypresscyw920735q60evb-01_firmware
-
cypresscyw20735b1_firmware
-
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
bluez-firmware
bullseye/non-free
1.2-4
fixed
buster
not-affected
bookworm/non-free-firmware
1.2-9
fixed
bullseye
not-affected
trixie/non-free-firmware
1.2-11.1
fixed
sid/non-free-firmware
1.2-12
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
bluez-firmware
noble
needs-triage
mantic
ignored
lunar
ignored
kinetic
ignored
jammy
needs-triage
focal
dne
bionic
dne
xenial
ignored
trusty
ignored
References
https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices
https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices