CVE-2021-22381Network attack vector

Service hang via unvalidated Bluetooth input

Published Aug 2, 2021 · Updated Aug 3, 2024

Improper input validation in EMUI 10.1.1 and 11.0.0 allows remote attackers to hang affected phones through the Bluetooth stack. The Bluetooth stack fails to reject invalid input and instead enters an infinite processing loop; Huawei has not identified the parser or message type. Bluetooth input must reach the device, and the published impact is limited to loss of availability, with no reported data access or modification.

CVSS severity7.5
High
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in EMUI 10.1.1 and 11.0.0 allows remote attackers to hang affected phones through the Bluetooth stack. The Bluetooth stack fails to reject invalid input and instead enters an infinite processing loop; Huawei has not identified the parser or message type. Bluetooth input must reach the device, and the published impact is limited to loss of availability, with no reported data access or modification.

The record

CVE
CVE-2021-22381
Published
Aug 2, 2021
Updated
Aug 3, 2024
Vendor
MindSpore
Product
EMUI
Classifications
CWE-20, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 2, 2021CVE 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.1.1
  2. Affected versionversion=11.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MindSpore · EMUIversion=10.1.1; version=11.0.0

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS:3.1/AV:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
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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