CVE-2021-40034
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 · uneditedThe video framework has the memory overwriting vulnerability caused by addition overflow. Successful exploitation of this vulnerability may affect the 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 confidenceA memory overwriting vulnerability exists in a video framework due to an addition overflow condition. This integer overflow in arithmetic operations allows memory corruption, potentially enabling denial of service through the overwrite of adjacent memory regions.
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= 10.1.0= 10.1.1= 11.0.0= 12.0.0= 2.0= 3.1.0= 3.1.1= 4.0.0CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Identify your Huawei OS versionGo to Settings > About Phone > Version on the device, or run 'getprop ro.build.version.emui' (for EMUI), 'getprop ro.build.version.harmonyos' (for HarmonyOS), or 'getprop ro.build.version.magic' (for Magic UI) via ADB shellAffected if The version matches 10.1.0, 10.1.1, 11.0.0, or 12.0.0 for EMUI; 2.0 for HarmonyOS; or 3.1.0, 3.1.1, or 4.0.0 for Magic UI
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Verify video framework is presentCheck for video-related system services or libraries: run 'pm list packages | grep video' or look for video.framework.apk in /system/framework/ via ADB shellAffected if Video framework packages or services are installed on the device
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Confirm video playback capability is enabledCheck if video player app is available or run 'dumpsys package | grep -i video' to list video-related components that may be invokedAffected if Any video playback functionality is accessible or enabled on the device
You are affected if your device runs one of the listed EMUI, HarmonyOS, or Magic UI versions AND has the video framework present and functional.
Generated from the published advisory. Verify against your own configuration.
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 dataFix the addition overflow by implementing proper bounds checking and integer overflow validation in the video framework's memory allocation and arithmetic operations. Validate all size calculations before performing memory operations.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-40034 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-40034 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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
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