CVE-2021-46856Network attack vector

Unauthenticated data disclosure via path traversal

Published Dec 20, 2022 · Updated Apr 17, 2025

Path traversal in Huawei Multi-screen Collaboration allows remote attackers to read data on affected HarmonyOS and EMUI releases. Huawei has not published the pathname-processing locus or the validation failure that permits traversal outside the intended directory. Network access without authentication or user interaction is sufficient; affected releases are HarmonyOS 2.0 and 3.0.0 and EMUI 12.0.0 and 12.0.1, with only confidentiality impact documented.

CVSS severity7.5
High
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Huawei Multi-screen Collaboration allows remote attackers to read data on affected HarmonyOS and EMUI releases. Huawei has not published the pathname-processing locus or the validation failure that permits traversal outside the intended directory. Network access without authentication or user interaction is sufficient; affected releases are HarmonyOS 2.0 and 3.0.0 and EMUI 12.0.0 and 12.0.1, with only confidentiality impact documented.

The record

CVE
CVE-2021-46856
Published
Dec 20, 2022
Updated
Apr 17, 2025
Vendor
MindSpore
Product
HarmonyOS
Classifications
CWE-22, T1533
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 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
  2. Affected versionversion=3.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MindSpore · HarmonyOSversion=2.0; version=3.0.0
MindSpore · EMUIversion=12.0.0; version=12.0.1

Published CVSS scores

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

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

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1533Data from Local System

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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