dbcve.org
EmuiOperating system · Huawei

CVE-2021-40056

HIGH · 7.5 CVSS v3.1 Published 2022-03-10
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
There is a vulnerability of copying input buffer without checking its size in the video framework. Successful exploitation of this vulnerability may affect availability.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A buffer copy operation in the video framework copies input data to a destination buffer without validating the size of the input, allowing an attacker to provide oversized input that overflows the destination buffer. This could cause a denial of service through crash or memory corruption.

MitigationImplement proper size validation before buffer copy operations, ensuring the input size does not exceed the destination buffer capacity. Use safe string/buffer functions that accept size parameters.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
EmuiOperating system
Affected:= 10.0.0= 10.1.0
Magic UiOperating system
Affected:= 3.1.0= 3.1.1

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check EMUI version
    Go to Settings > About Phone > Version on Huawei device, or run 'getprop ro.build.version.emui' via ADB shell
    Affected if Version displays 10.0.0 or 10.1.0
  2. Check Magic UI version
    Go to Settings > About Phone > Version on Honor device, or run 'getprop ro.build.version.magic' via ADB shell
    Affected if Version displays 3.1.0 or 3.1.1
  3. Verify video framework presence
    Check if video framework apps (Camera, Gallery, video player) are installed and functional on the device
    Affected if Video framework applications are present and operational on the affected version

Device is affected if it runs exactly EMUI 10.0.0, EMUI 10.1.0, Magic UI 3.1.0, or Magic UI 3.1.1 and uses the video framework functionality.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Implement proper size validation before buffer copy operations, ensuring the input size does not exceed the destination buffer capacity. Use safe string/buffer functions that accept size parameters.

Fix this in Emui Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
16.0 hours of engineering $2,840
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-40056 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data