CVE-2021-46884Network attack vector

Service interruption via addition-overflow memory overwrite

Published May 26, 2023 · Updated Jan 16, 2025

Memory overwriting in Huawei HarmonyOS and EMUI video frameworks allows remote attackers to interrupt service on affected devices. Huawei attributes the overwrite to addition overflow in the video framework but does not identify the affected function, input, or write operation. The network-reachable flaw requires no privileges or user interaction and affects the listed HarmonyOS 2.0.0, 2.0.1, and 2.1.0 and EMUI 10.1.0, 10.1.1, 11.0.0, 12.0.0, and 12.0.1 releases.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory overwriting in Huawei HarmonyOS and EMUI video frameworks allows remote attackers to interrupt service on affected devices. Huawei attributes the overwrite to addition overflow in the video framework but does not identify the affected function, input, or write operation. The network-reachable flaw requires no privileges or user interaction and affects the listed HarmonyOS 2.0.0, 2.0.1, and 2.1.0 and EMUI 10.1.0, 10.1.1, 11.0.0, 12.0.0, and 12.0.1 releases.

The record

CVE
CVE-2021-46884
Published
May 26, 2023
Updated
Jan 16, 2025
Vendor
MindSpore
Product
HarmonyOS
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 16, 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=2.0.0
  2. Affected versionversion=2.0.1
  3. Affected versionversion=2.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MindSpore · HarmonyOSversion=2.0.0; version=2.0.1; version=2.1.0
MindSpore · EMUIversion=10.1.0; version=10.1.1; version=11.0.0; version=12.0.0; version=12.0.1

Published CVSS scores

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.

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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application 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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