LiveActive security incident?Get immediate response
CVE Record

CVE-2021-34143: The Bluetooth Classic implementation in the Zhuhai Jieli AC6366C_DEMO_V1.0 does not properly handle the rec...

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.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This CVE is a Bluetooth Classic denial-of-service issue in the Zhuhai Jieli AC6366C_DEMO_V1.0 implementation. A nearby attacker could deadlock an affected device over radio, requiring user intervention to restart it. The source bundle does not identify data theft, code execution, active exploitation, or specific downstream products.

Executive priority

Treat this as a localized availability risk. It is not presented as remote internet exposure or data compromise, but it can matter for Bluetooth-dependent operations where device downtime or manual restart is costly.

Technical view

The implementation mishandles continuous unsolicited LMP responses after the paging procedure. The CVE description says LMP_AU_Rand packet flooding can trigger device deadlock. Impact is availability loss for devices using the named Jieli Bluetooth Classic implementation. No CVSS, CWE, patch details, or complete affected CPEs are provided.

Likely exposure

Exposure is most likely in embedded or consumer devices built on the Zhuhai Jieli AC6366C_DEMO_V1.0 Bluetooth Classic implementation. The provided CVE data does not enumerate downstream product models, firmware versions, or CPEs, so organizations need inventory confirmation before scoping impact.

Exploitation context

Exploitation requires Bluetooth radio range and targets availability, not confidentiality or integrity, based on the provided sources. The CVE is not listed as KEV, and the bundle provides no evidence of active exploitation in the wild.

Researcher notes

The public record is specific about the protocol condition but sparse on vendor remediation and downstream affected products. Avoid broad product claims without firmware provenance. The BrakTooth paper is relevant context, but this analysis relies only on the provided source bundle.

Mitigation direction

  • Identify devices or firmware derived from the Jieli AC63 Bluetooth SDK or named demo implementation.
  • Check Jieli and device-vendor advisories for firmware updates or operational mitigations.
  • Reduce Bluetooth exposure where feasible, especially in public or untrusted radio environments.
  • Prioritize replacement or isolation for critical devices that cannot be patched or rebooted safely.

Validation and detection

  • Review asset inventories for Jieli AC63, AC6366C, or related Bluetooth firmware references.
  • Ask suppliers whether shipped firmware includes the affected Bluetooth Classic implementation.
  • Confirm whether available firmware release notes mention BrakTooth or CVE-2021-34143 remediation.
  • Validate business impact by identifying devices whose reboot requirement would disrupt operations.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2021-34143 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.