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CVE-2021-34145

The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1...

5.3 MediumFix available

The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices does not properly handle the reception of LMP_max_slot with an invalid Baseband packet type (and LT_ADDRESS and LT_ADDR) after completion of the LMP setup procedure, allowing attackers in radio range to trigger a denial of service (firmware crash) via a crafted LMP packet.

Attack profile

How easy it is to exploit

Attack vector
Adjacent network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.52%Down 0.3 points since Sep 7, 2021
90%50%10%1%

What each source reports

NVD Score used 5.3

The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices does not properly handle the reception of LMP_max_slot with an invalid Baseband packet type (and LT_ADDRESS and LT_ADDR) after completion of the LMP setup procedure, allowing attackers in radio range to trigger a denial of service (firmware crash) via a crafted LMP packet.

Record
CVE-2021-34145
CVSS 3.1
5.3 MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
2.9 LowAV:A/AC:M/Au:N/C:N/I:N/A:P
Updated
2026-11-02
CVE List No score

The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices does not properly handle the reception of LMP_max_slot with an invalid Baseband packet type (and LT_ADDRESS and LT_ADDR) after completion of the LMP setup procedure, allowing attackers in radio range to trigger a denial of service (firmware crash) via a crafted LMP packet.

Record
CVE-2021-34145
Updated
2026-11-02
EUVDEUVD-2021-20807 No score

The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices does not properly handle the reception of LMP_max_slot with an invalid Baseband packet type (and LT_ADDRESS and LT_ADDR) after completion of the LMP setup procedure, allowing attackers in radio range to trigger a denial of service (firmware crash) via a crafted LMP packet.

Record
EUVD-2021-20807
Updated
2026-11-03
GitHub AdvisoriesGHSA-7j4h-6cq9-gmjv No score

The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1...

The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices does not properly handle the reception of LMP_max_slot with an invalid Baseband packet type (and LT_ADDRESS and LT_ADDR) after completion of the LMP setup procedure, allowing attackers in radio range to trigger a denial of service (firmware crash) via a crafted LMP packet.

Record
GHSA-7j4h-6cq9-gmjv
Updated
2026-11-02
OSV 5.3

The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices does not properly handle the reception of LMP_max_slot with an invalid Baseband packet type (and LT_ADDRESS and LT_ADDR) after completion of the LMP setup procedure, allowing attackers in radio range to trigger a denial of service (firmware crash) via a crafted LMP packet.

Record
CVE-2021-34145
CVSS 3.1
5.3 MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-34145 5.3

The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices does not properly handle the reception of LMP_max_slot with an invalid Baseband packet type (and LT_ADDRESS and LT_ADDR) after completion of the LMP setup procedure, allowing attackers in radio range to trigger a denial of service (firmware crash) via a crafted LMP packet.

Record
DEBIAN-CVE-2021-34145
CVSS 3.1
5.3 MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-34145 5.3

The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices does not properly handle the reception of LMP_max_slot with an invalid Baseband packet type (and LT_ADDRESS and LT_ADDR) after completion of the LMP setup procedure, allowing attackers in radio range to trigger a denial of service (firmware crash) via a crafted LMP packet.

Record
UBUNTU-CVE-2021-34145
CVSS 3.1
5.3 MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
bluez-firmware
Debian:12
 before 1.2-8, plus listed versions
1.0-21.0-31.2-11.2-21.2-3
Show 6 moreShow less
1.2-41.2-51.2-61.2-71.2-7~bpo11+11.2-8~bpo11+1
1.2-8
bluez-firmware
Debian:13
 before 1.2-8, plus listed versions
1.0-21.0-31.2-11.2-21.2-3
Show 6 moreShow less
1.2-41.2-51.2-61.2-71.2-7~bpo11+11.2-8~bpo11+1
1.2-8
bluez-firmware
Debian:14
 before 1.2-8, plus listed versions
1.0-21.0-31.2-11.2-21.2-3
Show 6 moreShow less
1.2-41.2-51.2-61.2-71.2-7~bpo11+11.2-8~bpo11+1
1.2-8
bluez-firmware
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.2-7
 None known

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-34145 is a medium vulnerability (CVSS 5.3) in Cypress Wireless Internet Connectivity For Embedded Devices, published September 7, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.52%, the 44th percentile. Fixed in bluez-firmware 1.2-8.

References

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