CVE-2018-0684
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 · uneditedBuffer overflow in Denbun by NEOJAPAN Inc. (Denbun POP version V3.3P R3.0 and earlier, Denbun IMAP version V3.3I R3.0 and earlier) allows remote attackers to execute arbitrary code or cause a denial-of-service (DoS) condition via multipart/form-data format data.
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 buffer overflow vulnerability in Denbun webmail (both POP and IMAP versions up to V3.3P R3.0/V3.3I R3.0) allows remote attackers to send specially crafted multipart/form-data requests to overflow a buffer, potentially achieving remote code execution or causing denial of service.
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<= 3.3i_r4.0<= 3.3p_r4.0CVSS 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:3.0/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 Denbun installation and versionLocate the Denbun installation directory and check for version files. Common locations include the web root (e.g., /var/www/html/denbun, C:\inetpub\wwwroot\denbun, or the application's root folder). Look for a version.txt, about page, or configuration file that displays the version number in format like 3.3i_rX.X or 3.3p_rX.XAffected if The installed version is 3.3i_r4.0 or lower for IMAP version, or 3.3p_r4.0 or lower for POP version
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Confirm product type (IMAP or POP)Determine whether the Denbun installation is the IMAP version (Neo Debun Imap) or POP version (Neo Debun Pop). Check the product name displayed in the webmail login page, about section, or installation documentation. The version string contains 'i' for IMAP (e.g., 3.3i_r3.0) or 'p' for POP (e.g., 3.3p_r3.0)Affected if The product is Neo Debun Imap version <= 3.3i_r4.0 or Neo Debun Pop version <= 3.3p_r4.0
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Verify web interface is accessibleConfirm the Denbun webmail interface is reachable over HTTP/HTTPS. Test access to the login page URL (typically /denbun/login.cgi or similar). Check if the web server (IIS or Apache) hosting Denbun is running and accepting connectionsAffected if The Denbun web interface is exposed and accessible to network attackers, enabling them to send malicious multipart/form-data requests
You are affected if your Denbun webmail is version 3.3i_r4.0 or lower (IMAP) or 3.3p_r4.0 or lower (POP) and the web interface is network-accessible.
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 dataApply the vendor-supplied patch or upgrade to a fixed version of Denbun. If immediate patching is not possible, restrict network access to the webmail interface using firewall rules or VPN access controls.
- Consultation4.0 h
- Implementation2.0 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-2018-0684 — 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-2018-0684 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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