CVE-2018-16171
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 · uneditedDirectory traversal vulnerability in Cybozu Remote Service 3.0.0 to 3.1.8 allows remote attackers to execute Java code file on the server via unspecified vectors.
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 · high confidenceA directory traversal vulnerability in Cybozu Remote Service versions 3.0.0 through 3.1.8 allows remote attackers to manipulate file paths and execute arbitrary Java code files on the server. The vulnerability is network-exploitable and achieves high severity (CVSS 8.8) due to the ability to achieve remote code execution without authentication.
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>= 3.0.0, <= 3.1.8CVSS 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
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/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 Cybozu Remote Service installationLocate and query the installed Cybozu Remote Service Manager application and retrieve its version number from the software inventory,about panel,or system informationAffected if The installed version falls within the range 3.0.0 to 3.1.8 inclusive
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Verify the software is network-facingConfirm that the Cybozu Remote Service web interface or API is exposed to network connections (typically on ports 80,443,or custom HTTP ports)Affected if The service is accessible over the network without requiring VPN or internal-only access
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Check for file upload or import functionalityReview the application's available modules and features for any file upload,file import,or attachment handling capabilities that process file pathsAffected if File handling features that accept user-supplied paths are enabled and accessible to unauthenticated users
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Confirm Java runtime environmentVerify that a Java runtime is installed and configured to execute .class or .jar files on the server hosting Cybozu Remote ServiceAffected if Java runtime environment is present and the application has write access to directories where Java code files could be placed and executed
The environment is affected if Cybozu Remote Service Manager version 3.0.0 through 3.1.8 is installed and network-accessible, allowing unauthenticated attackers to manipulate file paths through exposed file-handling features.
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 Cybozu Remote Service to version 3.1.9 or later. Additionally, implement strict input validation and path canonicalization on all file-handling operations to prevent directory traversal sequences.
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA8.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $12,352.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-16171 — 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-2018-16171 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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