CVE-2021-39983Network attack vector

Unauthenticated HwNearbyMain process restart

Published Jan 3, 2022 · Updated May 22, 2025

Data processing error in Huawei HarmonyOS 2.0 allows remote attackers to restart the HwNearbyMain process through network input. Huawei has not published the specific HwNearbyMain data-handling locus or the incorrect operation performed on untrusted input. No authentication or user interaction is required, and exploitation interrupts only the affected process rather than the device or operating system.

CVSS severity7.5
High
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data processing error in Huawei HarmonyOS 2.0 allows remote attackers to restart the HwNearbyMain process through network input. Huawei has not published the specific HwNearbyMain data-handling locus or the incorrect operation performed on untrusted input. No authentication or user interaction is required, and exploitation interrupts only the affected process rather than the device or operating system.

The record

CVE
CVE-2021-39983
Published
Jan 3, 2022
Updated
May 22, 2025
Vendor
Huawei Technologies Co., Ltd.
Product
HarmonyOS
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 3, 2022CVE publishedPublication date reported by the CVE source.
  2. May 22, 2025Record 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Huawei Technologies Co., Ltd. · HarmonyOSversion=2.0

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5CISA-ADPCVSS: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

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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