CVE-2021-22857
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 CGE page with download function contains a Directory Traversal vulnerability. Attackers can use this loophole to download system files arbitrarily.
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 Directory Traversal vulnerability exists in the CGE page's download function. Attackers can manipulate path parameters using traversal sequences (e.g., ../../../) to access arbitrary files on the system outside the intended download directory.
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= 1.00CVSS 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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Identify Changjia Property Management System installationSearch system files, web directories, or application inventories for 'Changjia Property Management System' or 'Changjia' software componentsAffected if The software is present and matches version 1.00
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Verify installed versionCheck application version information through admin panel, installed programs list, or version file within the Changjia application directoryAffected if Version is exactly 1.00
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Locate CGE page componentSearch for files or routes containing 'CGE' in the web application directory, typically in page/script/controller files related to download functionalityAffected if CGE page and download function are present and accessible
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Confirm download function accessibilityAccess the CGE page download endpoint (typically via HTTP request to the CGE-related URL path) and verify it accepts path parametersAffected if The download function accepts path parameters without strict validation
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Test for directory traversal vulnerabilityIf accessible, attempt a controlled test request to the download function with path traversal sequences (e.g., ../../../) in the path parameter to observe if arbitrary file paths are processedAffected if The application processes path traversal sequences and returns files outside the intended directory
User is affected if Changjia Property Management System version 1.00 is installed and the CGE page download function is accessible with unvalidated path parameters.
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 dataImplement strict input validation on file path parameters, use basename() to strip directory components, employ file whitelisting, and ensure proper file access controls to prevent unauthorized file access.
- Consultation2.0 h
- Implementation6.0 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 $3,904.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-22857 — 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-2021-22857 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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