CVE-2022-20021

Bluetooth application crash via repeated connection requests

Published Jan 4, 2022 · Updated Aug 3, 2024

Expected behavior violation in Bluetooth on affected MediaTek chipsets running Android 10.0 and 11.0 allows remote attackers to crash Bluetooth. The Bluetooth implementation mishandles reception of multiple LMP_host_connection_req packets and terminates the application. An unauthenticated attacker within Bluetooth radio range needs no user interaction; the documented consequence is interruption of Bluetooth service.

CVSS severity6.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Expected behavior violation in Bluetooth on affected MediaTek chipsets running Android 10.0 and 11.0 allows remote attackers to crash Bluetooth. The Bluetooth implementation mishandles reception of multiple LMP_host_connection_req packets and terminates the application. An unauthenticated attacker within Bluetooth radio range needs no user interaction; the documented consequence is interruption of Bluetooth service.

The record

CVE
CVE-2022-20021
Published
Jan 4, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-440, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 4, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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

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

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-440Expected Behavior Violation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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