CVE-2025-66331

Service interruption through undisclosed office-service flaw

Published Dec 8, 2025 · Updated Dec 8, 2025

Denial of service in Huawei HarmonyOS 5.0.1, 5.1.0, and 6.0.0 allows context-dependent attackers to interrupt the office service. Huawei has not published the faulting office-service operation or the input that reaches it. Exploitation requires local access and user interaction, and the documented consequence is reduced availability without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Huawei HarmonyOS 5.0.1, 5.1.0, and 6.0.0 allows context-dependent attackers to interrupt the office service. Huawei has not published the faulting office-service operation or the input that reaches it. Exploitation requires local access and user interaction, and the documented consequence is reduced availability without reported data disclosure or modification.

The record

CVE
CVE-2025-66331
Published
Dec 8, 2025
Updated
Dec 8, 2025
Vendor
MindSpore
Product
HarmonyOS
Classifications
CWE-494, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 8, 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=5.0.1
  2. Affected versionversion=5.1.0
  3. Affected versionversion=6.0.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

MindSpore · HarmonyOSversion=5.0.1; version=5.1.0; version=6.0.0

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.3Huawei TechnologiesCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-494Download of Code Without Integrity Check
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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