CVE-2021-34149Public exploit

Device deadlock via LMP_AU_Rand packet flooding

Published Sep 7, 2021 · Updated Aug 4, 2024

Denial of service in Texas Instruments CC256XCQFN-EM firmware allows physically proximate attackers to deadlock the device via Bluetooth. Continuous unsolicited LMP_AU_Rand responses after paging trigger a heap overflow in the Bluetooth firmware instead of being safely rejected. The attacker must be within radio range; the CC2564C remains deadlocked until user intervention, and an MSP432 host using the TI stack can temporarily hang.

CVSS severity6.5
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Texas Instruments CC256XCQFN-EM firmware allows physically proximate attackers to deadlock the device via Bluetooth. Continuous unsolicited LMP_AU_Rand responses after paging trigger a heap overflow in the Bluetooth firmware instead of being safely rejected. The attacker must be within radio range; the CC2564C remains deadlocked until user intervention, and an MSP432 host using the TI stack can temporarily hang.

The record

CVE
CVE-2021-34149
Published
Sep 7, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1498
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

3.3NIST NVDAV:A/AC:L/Au:N/C:N/I:N/A:P
6.5NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1498Network Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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