CVE-2021-40037

Device crash via MPTCP type confusion

Published Jan 7, 2022 · Updated Aug 4, 2024

Type confusion in Huawei HarmonyOS, EMUI, and Magic UI allows local users to crash and restart affected smartphones through MPTCP. The MPTCP subsystem accesses a resource through an incompatible type; Huawei has not disclosed the affected code path, resource, or triggering input. Exploitation requires low-privileged local access and interrupts service by crashing and restarting the device, with no reported confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in Huawei HarmonyOS, EMUI, and Magic UI allows local users to crash and restart affected smartphones through MPTCP. The MPTCP subsystem accesses a resource through an incompatible type; Huawei has not disclosed the affected code path, resource, or triggering input. Exploitation requires low-privileged local access and interrupts service by crashing and restarting the device, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2021-40037
Published
Jan 7, 2022
Updated
Aug 4, 2024
Vendor
MindSpore
Product
HarmonyOS
Classifications
CWE-843, T1529
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 7, 2022CVE 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?

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

  1. Affected versionversion=2.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

MindSpore · HarmonyOSversion=2.0
MindSpore · EMUIversion=10.0.0; version=10.1.0; version=10.1.1; version=11.0.0; version=11.0.1; version=12.0.0
MindSpore · Magic UIversion=3.0.0; version=3.1.0; version=3.1.1; version=4.0.0

Published CVSS scores

4.9NVDAV:L/AC:L/Au:N/C:N/I:N/A:C
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1529System Shutdown/Reboot

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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