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MitreCVE-2021-34146

HistorySep 07, 2021 - 7:15 a.m.

CVE-2021-34146

2021-09-0707:15:07

mitre

web.nvd.nist.gov

cypress cyw920735q60evb

bluetooth classic

vulnerability

denial of service

nvd

cve-2021-34146

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

AI Score

6.3

Confidence

High

EPSS

0.001

Percentile

29.0%

JSON

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.

Affected configurations

Nvd

Node

cypresscyw920735q60evb-01_firmwareMatch-

AND

cypresscyw920735q60evb-01Match-

Node

cypresscyw20735b1_firmwareMatch-

AND

cypresscyw20735b1Match-

VendorProductVersionCPE
cypresscyw920735q60evb-01_firmware-cpe:2.3:o:cypress:cyw920735q60evb-01_firmware:-:*:*:*:*:*:*:*
cypresscyw920735q60evb-01-cpe:2.3:h:cypress:cyw920735q60evb-01:-:*:*:*:*:*:*:*
cypresscyw20735b1_firmware-cpe:2.3:o:cypress:cyw20735b1_firmware:-:*:*:*:*:*:*:*
cypresscyw20735b1-cpe:2.3:h:cypress:cyw20735b1:-:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
cypress	cyw920735q60evb-01_firmware	-	cpe:2.3:o:cypress:cyw920735q60evb-01_firmware:-:::::::*
cypress	cyw920735q60evb-01	-	cpe:2.3:h:cypress:cyw920735q60evb-01:-:::::::*
cypress	cyw20735b1_firmware	-	cpe:2.3:o:cypress:cyw20735b1_firmware:-:::::::*
cypress	cyw20735b1	-	cpe:2.3:h:cypress:cyw20735b1:-:::::::*

References

dl.packetstormsecurity.net/papers/general/braktooth.pdf

www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices

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

AI Score

6.3

Confidence

High

EPSS

0.001

Percentile

29.0%

JSON

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