CVE-2021-28075
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 · uneditediKuaiOS 3.4.8 Build 202012291059 has an arbitrary file download vulnerability, which can be exploited by attackers to obtain sensitive information.
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 confidenceiKuaiOS 3.4.8 Build 202012291059 contains a path traversal or improper access control vulnerability in its file download functionality, allowing unauthenticated remote attackers to request and download arbitrary system files by manipulating file paths, potentially exposing configuration files, credentials, and other sensitive data.
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= 3.4.8CVSS 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
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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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Confirm iKuaiOS version 3.4.8 is installedAccess the iKuaiOS administrative web interface and navigate to System Settings > System Status or About page to view the firmware version. Alternatively, check via CLI if accessible: look for version string in boot logs or system information commands.Affected if The displayed version is exactly 3.4.8 (Build 202012291059)
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Verify file download feature is accessibleIdentify the file download endpoint in the iKuaiOS web interface, typically found under System Tools > File Manager, Backup/Restore, or Log Export sections. Confirm the feature loads without authentication errors.Affected if The file download or file management interface is reachable without requiring valid authentication credentials
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Check administrative interface network exposureDetermine if the iKuaiOS admin interface (port 80/443 or custom port) is bound to WAN/external-facing interfaces. Review firewall rules to see if the management port is accessible from untrusted networks.Affected if The admin interface is accessible from WAN/outside networks or from untrusted IP addresses
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Test for path traversal vulnerabilityUsing a web proxy or curl, attempt to access the file download endpoint with path traversal payloads such as ../../../../etc/passwd or ../../../../etc/ikuai/xxx.conf to see if arbitrary file retrieval is possible without authentication.Affected if The system returns contents of files outside the intended download directory, indicating the path traversal flaw is present
You are affected if running iKuaiOS version 3.4.8 AND the file download functionality is exposed AND the admin interface is accessible to untrusted users, allowing unauthenticated path traversal attacks to retrieve sensitive system files.
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 dataUpgrade to a patched iKuaiOS version (contact vendor for specific fixed release); if immediate patching is unavailable, restrict administrative interface access to trusted IPs only via firewall rules and disable any unnecessary file serving/download features.
- Consultation6.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-28075 — 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-2021-28075 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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