What’s Vulnerable › Vulnerabilities

CVE-2021-34144

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-07 · updated 2026-06-17

Description

The Bluetooth Classic implementation in the Zhuhai Jieli AC6366C BT SDK through 0.9.1 does not properly handle the reception of truncated LMP_SCO_Link_Request packets while no other BT connections are active, allowing attackers in radio range to prevent new BT connections (disabling the AB5301A inquiry and page scan procedures) via a crafted LMP packet. The user needs to manually perform a power cycle (restart) of the device to restore BT connectivity.

Affected products

• Zh-Jieli Fw-Ac63 Bt Sdk: through 0.9.1

References

• https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
• https://github.com/Jieli-Tech/fw-AC63_BT_SDK
• https://launchstudio.bluetooth.com/ListingDetails/91371
• https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
• https://github.com/Jieli-Tech/fw-AC63_BT_SDK
• https://launchstudio.bluetooth.com/ListingDetails/91371

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