CVE-2021-34143

Name: CVE-2021-34143
Creator: NVD / NIST
Published: 2021-09-07T07:15:07.237+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.72%

Last modified Jun 17, 2026

CVE-2021-34143 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. The Bluetooth Classic implementation in the Zhuhai Jieli AC6366C_DEMO_V1.0 does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service (deadlock) of the device by flooding it with LMP_AU_Rand packets after paging procedure. User intervention is required to restart the device.. EPSS estimates a 0.72% chance of exploitation in the next 30 days.

Description

The Bluetooth Classic implementation in the Zhuhai Jieli AC6366C_DEMO_V1.0 does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service (deadlock) of the device by flooding it with LMP_AU_Rand packets after paging procedure. User intervention is required to restart the device.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.72%

49.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Zh-Jieli	Fw-Ac63 Bt Sdk	1.0.0

References

https://dl.packetstormsecurity.net/papers/general/braktooth.pdfBroken Link
https://github.com/Jieli-Tech/fw-AC63_BT_SDKThird Party Advisory
https://launchstudio.bluetooth.com/ListingDetails/91371Third Party Advisory
https://dl.packetstormsecurity.net/papers/general/braktooth.pdfBroken Link
https://github.com/Jieli-Tech/fw-AC63_BT_SDKThird Party Advisory
https://launchstudio.bluetooth.com/ListingDetails/91371Third Party Advisory

Timeline

Published: Sep 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34143?

How severe is CVE-2021-34143?

CVE-2021-34143 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.72% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34143?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34143?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST