CVE-2021-37128
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 · uneditedHwPCAssistant has a Path Traversal vulnerability .Successful exploitation of this vulnerability may write any file.
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 confidenceHwPCAssistant contains a path traversal vulnerability allowing remote attackers to write arbitrary files to the filesystem. The CVSS 9.8 score indicates this is exploitable over the network without authentication, and the ability to write any file could enable remote code execution.
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< 2.0CVSS 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 if the system runs Huawei HarmonyOSCheck the OS version or system information to confirm HarmonyOS is installedAffected if The system is running Huawei HarmonyOS with version below 2.0
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Locate the HwPCAssistant componentIdentify whether HwPCAssistant or related PC assistant service is present on the systemAffected if HwPCAssistant is installed and present on the device
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Determine HarmonyOS versionRetrieve the installed HarmonyOS version and compare against the affected range (< 2.0)Affected if The installed HarmonyOS version is lower than 2.0 and HwPCAssistant is present
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Check network exposure of HwPCAssistantDetermine if HwPCAssistant network services are exposed or accessible from the networkAffected if HwPCAssistant is network-accessible without authentication
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Verify file write operations from remote sourcesAudit system logs or network traffic for evidence of unauthorized file write attempts targeting the systemAffected if Remote unauthenticated file write requests to HwPCAssistant are observed or logged
The environment is affected if it runs Huawei HarmonyOS version below 2.0 with HwPCAssistant installed and exposed to network 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 · scoped2.0
Implement strict input validation and sanitization for file path parameters, use allowlist validation, and ensure file operations restrict paths to intended directories using canonical path resolution.
HarmonyOS 2.0 or later
- Check current HarmonyOS version on the device via Settings > About Phone > Version
- Ensure device is connected to stable internet and has sufficient battery (above 50%)
- Navigate to Settings > System & Updates > Software Update
- Tap 'Check for updates' and download the latest available HarmonyOS 2.0 or later version
- Restart the device after the update completes to apply the patch
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 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 $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-37128 — 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-2021-37128 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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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.
- 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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