CVE-2021-31611

MEDIUM
5.7
CVSS Score
Published: September 7, 2021 at 06:03 AM UTC
Updated: June 17, 2026 at 03:52 AM UTC
10 products affected across 1 vendorAC6901 FirmwareAC6921 FirmwareAC6928 Firmware

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Severity
MEDIUM5.7
Exploit prediction
EPSS 0.4%

Description

The Bluetooth Classic implementation on Zhuhai Jieli AC690X and AC692X devices does not properly handle an out-of-order LMP Setup procedure that is followed by a malformed LMP packet, allowing attackers in radio range to deadlock a device via a crafted LMP packet. The user needs to manually reboot the device to restore communication.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
zh-jieli-ac6901 (same device)
All versions
zh-jieli-ac6921 (same device)
All versions
zh-jieli-ac6925 (same device)
All versions
zh-jieli-ac6926 (same device)
All versions
zh-jieli-ac6928 (same device)
All versions
All versions
All versions
All versions
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

CVSS

Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-667

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