How severe is CVE-2021-34143?

CVE-2021-34143 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-34143 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34143?

CVE-2021-34143 affects Zh-jieli Fw-ac63 Bt Sdk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-34143?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-34143 published?

CVE-2021-34143 was published on 2021-09-07 and last updated on 2026-06-17.

CVE-2021-34143

CVE-2021-34143 is a medium-severity vulnerability in Zh-jieli Fw-ac63 Bt Sdk with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.1
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Zh-jieli Fw-ac63 Bt Sdk
Published: 2021-09-07
Last modified: 2026-06-17

Description

The Bluetooth Classic implementation in the Zhuhai Jieli AC6366C_DEMO_V1.0 does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service (deadlock) of the device by flooding it with LMP_AU_Rand packets after paging procedure. User intervention is required to restart the device.

Frequently asked questions

What is CVE-2021-34143?: The Bluetooth Classic implementation in the Zhuhai Jieli AC6366C_DEMO_V1.0 does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service (deadlock) of the device by flooding it with LMP_AU_Rand packets after paging procedure. User intervention is required to restart the device.
How severe is CVE-2021-34143?: CVE-2021-34143 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-34143 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34143?: CVE-2021-34143 affects Zh-jieli Fw-ac63 Bt Sdk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-34143?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-34143 published?: CVE-2021-34143 was published on 2021-09-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:zh-jieli:fw-ac63_bt_sdk:1.0.0:*:*:*:*:*:*:*

More vulnerabilities in Zh-jieli Fw-ac63 Bt Sdk

CVE-2021-34144 — Medium (CVSS 6.5): The Bluetooth Classic implementation in the Zhuhai Jieli AC6366C BT SDK through 0.9.1 does not properly handle the…

All CVEs affecting Zh-jieli Fw-ac63 Bt Sdk →