CVE-2021-31612

What it is

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.

At a glance

Exploitability

Can be exploited from the same network segment without logging in. High risk of service disruption.

Exploit odds

0.5% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-09-07 07:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:52 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.5% in the next 30 days (EPSS).
• Severity: 6.5 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-09-07 07:15 UTC

Last modified

2026-06-17 03:52 UTC

Exploit probability

0.5% · EPSS, next 30 days

Record status

Modified

Affected

• zh-jieli ac6901 Firmware
• zh-jieli ac690n Firmware
• zh-jieli ac692n Firmware
• zh-jieli ac6902 Firmware
• zh-jieli ac6903 Firmware
• zh-jieli ac6905 Firmware
• zh-jieli ac6904 Firmware
• zh-jieli ac6907 Firmware

Attack profile CVSS 3.1 · 6.5

Attack vector

Adjacent network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-31612.md and follow it. Check whether this project is affected by CVE-2021-31612. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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