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ubuntucveUbuntu.comUB:CVE-2021-34146
HistorySep 07, 2021 - 12:00 a.m.

CVE-2021-34146

2021-09-0700:00:00
ubuntu.com
ubuntu.com
8
cypress cyw920735q60evb
bluetooth classic
denial of service
restart
lmp_au_rand packets
radio range
bugs
debian
unix

CVSS2

6.1

Attack Vector

ADJACENT_NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:A/AC:L/Au:N/C:N/I:N/A:C

CVSS3

6.5

Attack Vector

ADJACENT

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.001

Percentile

29.0%

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.

Bugs

OSVersionArchitecturePackageVersionFilename
ubuntu22.04noarchbluez-firmware< anyUNKNOWN
ubuntu24.04noarchbluez-firmware< anyUNKNOWN

CVSS2

6.1

Attack Vector

ADJACENT_NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:A/AC:L/Au:N/C:N/I:N/A:C

CVSS3

6.5

Attack Vector

ADJACENT

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.001

Percentile

29.0%