CVE-2018-0680
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 · uneditedDenbun by NEOJAPAN Inc. (Denbun POP version V3.3P R4.0 and earlier, Denbun IMAP version V3.3I R4.0 and earlier) uses hard-coded credentials, which may allow remote attackers to read/send mail or change the configuration.
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 confidenceDenbun mail server versions V3.3P R4.0 and earlier (POP) and V3.3I R4.0 and earlier (IMAP) contain hard-coded credentials embedded in the software or configuration. Attackers can use these credentials to remotely authenticate without user interaction, enabling unauthorized access to read/send emails and modify system configuration.
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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Confirm Denbun installationCheck for Denbun mail server processes or installed directories on the system. Look for process names containing 'denbun' or installation paths like /opt/denbun, /var/denbun, or C:\Program Files\DenbunAffected if Denbun mail server software is found on the system
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Identify installed versionLocate version information in Denbun configuration files, about pages, or system logs. Common locations include config files in the Denbun installation directory or the 'version' or 'about' interface in the admin panelAffected if Version is 3.3i_r4.0 or lower for IMAP, or 3.3p_r4.0 or lower for POP
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Determine active servicesCheck which Denbun services are enabled and running. Verify if POP service (denbunpop or similar process) and/or IMAP service (denbuni or similar process) are activeAffected if Either POP or IMAP service is enabled and running on the affected version ranges
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Verify credential statusExamine the authentication configuration to determine whether the default hard-coded credentials have been changed. Check user account configuration files or authentication settings in the Denbun admin interfaceAffected if Credentials remain at default factory settings or have not been explicitly changed from vendor defaults
A system is affected if Denbun mail server is installed with IMAP version 3.3i_r4.0 or earlier, or POP version 3.3p_r4.0 or earlier, and the hard-coded credentials have not been changed from their default values.
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 dataImmediately identify and change all hard-coded credentials to unique, strong passwords. If vendor patches are available, apply them. Consider network segmentation and implement proper credential management (e.g., external authentication, credential vaults) to prevent recurrence.
- Consultation4.0 h
- Implementation8.0 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-2018-0680 — 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-2018-0680 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
- No spam, self-promotion, credentials, or personal data