CVE-2021-37040
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 · uneditedThere is a Parameter injection vulnerability in Huawei Smartphone.Successful exploitation of this vulnerability may cause privilege escalation of files after CIFS share mounting.
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 parameter injection vulnerability exists in Huawei smartphones that allows privilege escalation of files after mounting CIFS shares. The vulnerability enables an attacker to inject malicious parameters during CIFS share operations, potentially leading to unauthorized privilege escalation and file system manipulation.
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< 2.0= 11.0.0= 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/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 installed operating systemCheck the device settings for the OS version - look under Settings > About Phone > Version for HarmonyOS/EMUI/Magic UI version numberAffected if The version shows HarmonyOS < 2.0, EMUI = 11.0.0, or Magic UI = 4.0.0
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Confirm CIFS/SMB client capabilityCheck if the device has CIFS/SMB mounting functionality available - this may appear as a file sharing option, network storage mount feature, or SMB client capability in the system settings or developer optionsAffected if CIFS or SMB mount functionality is present and enabled on the device
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Review mounted network sharesInspect the device for any configured CIFS/SMB shares - check file manager apps for network share mounts or examine /proc/mounts or similar mount points if root access is availableAffected if Any CIFS or SMB shares are currently mounted or have been recently mounted on the device
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Audit file permission changesReview system logs or security audit logs for unexpected file permission changes, ownership modifications, or privileged file operations that coincide with CIFS share accessAffected if Suspicious privilege escalation or unauthorized file ownership changes are observed in logs after CIFS share operations
The device is likely affected if it runs any of the affected OS versions (HarmonyOS < 2.0, EMUI 11.0.0, or Magic UI 4.0.0) AND has CIFS/SMB mounting functionality enabled or has mounted untrusted network shares.
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 data2.0
Apply vendor-supplied firmware updates for affected Huawei smartphone models once released; avoid mounting untrusted CIFS/SMB shares until patches are applied.
- Consultation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,096.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-37040 — 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-2021-37040 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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