CVE-2021-39975Network attack vector

Remote denial of service via Hilinksvc data processing

Published Jan 3, 2022 · Updated Aug 4, 2024

Data processing error in Hilinksvc in Huawei HarmonyOS 2.0 allows remote attackers to cause denial of service via network requests. Huawei and NVD do not disclose the specific Hilinksvc operation or malformed input that triggers the failure. The record indicates unauthenticated network reachability and an availability-only impact; exploitation can interrupt service but does not report data disclosure or modification.

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 Hilinksvc in Huawei HarmonyOS 2.0 allows remote attackers to cause denial of service via network requests. Huawei and NVD do not disclose the specific Hilinksvc operation or malformed input that triggers the failure. The record indicates unauthenticated network reachability and an availability-only impact; exploitation can interrupt service but does not report data disclosure or modification.

The record

CVE
CVE-2021-39975
Published
Jan 3, 2022
Updated
Aug 4, 2024
Vendor
MindSpore
Product
HarmonyOS
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 3, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

MindSpore · 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

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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