CVE-2021-40043
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 laser command injection vulnerability exists on AIS-BW80H-00 versions earlier than AIS-BW80H-00 9.0.3.4(H100SP13C00). The devices cannot effectively defend against external malicious interference. Attackers need the device to be visually exploitable and successful triggering of this vulnerability could execute voice commands on the device.
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 confidenceThis is a laser-based command injection vulnerability in AIS-BW80H-00 voice assistant devices. Attackers can inject arbitrary voice commands by directing laser light at the device's microphone from a distance, exploiting the device's inability to effectively defend against external malicious interference. The vulnerability requires visual line-of-sight access to the device.
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< 9.0.3.4\(h100sp13c00\)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
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 the device modelLocate the physical device or check device documentation/inventory to confirm the model is Huawei Ais Bw80h-00Affected if The device model is Huawei Ais BW80H-00 and is not the fixed firmware version
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Check the installed firmware versionAccess the device administrative interface or settings menu and locate the firmware version information. Compare it against the affected range (versions prior to 9.0.3.4(h100sp13c00))Affected if The firmware version is lower than 9.0.3.4(h100sp13c00)
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Inspect microphone placement and exposureVisually inspect the device location and identify whether microphones are exposed to windows, doors, or accessible exterior walls that could provide line-of-sight accessAffected if The device microphones have visual line-of-sight to exterior access points or uncontrolled areas
A user is affected if they have a Huawei Ais BW80H-00 device running firmware below version 9.0.3.4(h100sp13c00) with microphones exposed to visual line-of-sight access.
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.
dbcve · scoped9.0.3.4
Update device firmware to version AIS-BW80H-00 9.0.3.4(H100SP13C00) or later, which contains the fix for laser injection protection. If immediate patching is not possible, restrict physical line-of-sight access to device microphones and monitor for unauthorized voice command execution.
AIS-BW80H-00 9.0.3.4(H100SP13C00) or later
- Identify the current firmware version of the AIS-BW80H-00 device
- Download firmware version 9.0.3.4(H100SP13C00) or later from the official Huawei support website
- Apply the firmware upgrade following Huawei's standard upgrade procedure for the AIS-BW80H-00 device
- Verify the firmware has been successfully updated to version 9.0.3.4(H100SP13C00) or later
- Confirm normal device operation after the upgrade
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation2.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-40043 — 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-2021-40043 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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