CVE-2021-34144: The Bluetooth Classic implementation in the Zhuhai Jieli AC6366C BT SDK through 0.9.1 does not properly handle

Q: How do I fix CVE-2021-34144?

fw-ac63 bt sdk: upgrade to newer than 0.9.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-34144 being exploited?

CVE-2021-34144 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-34144 affect?

CVE-2021-34144 affects fw-ac63 bt sdk. Severity is medium (CVSS 6.5). 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 ran

Q: How urgent is CVE-2021-34144?

Priority 36/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2021-34144 is a medium-severity flaw (CVSS 6.5) affecting fw-ac63 bt sdk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 connect

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Published	2021-09-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: zh-jieli

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-09-07 06:15 UTCPublished CVE record published
2026-06-17 03:55 UTCUpdated Record last modified

zh-jieli fw-ac63 bt sdk UPGRADE

Affected: <= 0.9.1

Fixed in: newer than 0.9.1

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-34144?

fw-ac63 bt sdk: upgrade to newer than 0.9.1. Exact commands for each OS are on this page.

Is CVE-2021-34144 being exploited?

CVE-2021-34144 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-34144 affect?

CVE-2021-34144 affects fw-ac63 bt sdk. Severity is medium (CVSS 6.5). 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 ran

How urgent is CVE-2021-34144?

Priority 36/100. No elevated risk signals yet.

Software pages

Bluetooth vulnerabilities

Related CVEs

CVE-2021-34143 MEDIUM 6.5 MITIGATE The Bluetooth Classic implementation in the Zhuhai Jieli AC6366C_DEMO_V1.0 does not properly handle the recept

References

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