CVE-2021-46851

Abnormal video playback via DRM memory verification

Published Nov 9, 2022 · Updated May 1, 2025

The DRM module in Huawei HarmonyOS 2.0 and EMUI 12.0.0 allows attackers to cause abnormal video playback via insecure memory-attribute verification. The DRM verifier performs insufficient checks of secure-memory attributes before processing playback buffers. Exploitation requires access to the device's DRM path; published impact is limited to disrupted video playback, with no documented data disclosure or code execution.

CVSS severity9.8
Critical
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

The DRM module in Huawei HarmonyOS 2.0 and EMUI 12.0.0 allows attackers to cause abnormal video playback via insecure memory-attribute verification. The DRM verifier performs insufficient checks of secure-memory attributes before processing playback buffers. Exploitation requires access to the device's DRM path; published impact is limited to disrupted video playback, with no documented data disclosure or code execution.

The record

CVE
CVE-2021-46851
Published
Nov 9, 2022
Updated
May 1, 2025
Vendor
MindSpore
Product
HarmonyOS
Classifications
CWE-284
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 9, 2022CVE publishedPublication date reported by the CVE source.
  2. May 1, 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?

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  1. Affected versionversion=2.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

MindSpore · HarmonyOSversion=2.0
MindSpore · EMUIversion=12.0.0

Published CVSS scores

9.8CISA ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control

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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