CVE-2021-31612

Name: CVE-2021-31612
Creator: NVD / NIST
Published: 2021-09-07T07:15:07.093+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.51%

Last modified Jun 17, 2026

CVE-2021-31612 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. The Bluetooth Classic implementation on Zhuhai Jieli AC690X devices does not properly handle the reception of an oversized LMP packet greater than 17 bytes during the LMP auto rate procedure, allowing attackers in radio range to trigger a deadlock via a crafted LMP packet.. EPSS estimates a 0.51% chance of exploitation in the next 30 days.

Description

The Bluetooth Classic implementation on Zhuhai Jieli AC690X devices does not properly handle the reception of an oversized LMP packet greater than 17 bytes during the LMP auto rate procedure, allowing attackers in radio range to trigger a deadlock via a crafted LMP packet.

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

0.51%

39.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Zh-Jieli	Ac6901 Firmware	All versions
Zh-Jieli	Ac690n Firmware	All versions
Zh-Jieli	Ac692n Firmware	All versions
Zh-Jieli	Ac6902 Firmware	All versions
Zh-Jieli	Ac6903 Firmware	All versions
Zh-Jieli	Ac6905 Firmware	All versions
Zh-Jieli	Ac6904 Firmware	All versions
Zh-Jieli	Ac6907 Firmware	All versions
Zh-Jieli	Ac6908 Firmware	All versions
Zh-Jieli	Ac6997 Firmware	All versions
Zh-Jieli	Ac6998 Firmware	All versions
Zh-Jieli	Ac6999 Firmware	All versions

References

http://www.zh-jieli.com/product/68-cn.htmlProduct, Vendor Advisory
https://dl.packetstormsecurity.net/papers/general/braktooth.pdfBroken Link
https://launchstudio.bluetooth.com/ListingDetails/19746Third Party Advisory
http://www.zh-jieli.com/product/68-cn.htmlProduct, Vendor Advisory
https://dl.packetstormsecurity.net/papers/general/braktooth.pdfBroken Link
https://launchstudio.bluetooth.com/ListingDetails/19746Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-31612?

How severe is CVE-2021-31612?

CVE-2021-31612 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31612?

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-2021-31612?

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

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Source: NVD / NIST