CVE-2000-0399
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 MDaemon POP server allows remote attackers to cause a denial of service via a long user name.
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 confidenceBuffer overflow vulnerability in MDaemon's POP3 server allows remote attackers to crash the service by sending an excessively long user name during the authentication process, causing a 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= 3.0.3= 3.1_betaCVSS 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
- Authentication
- None
- Confidentiality
- None
- Integrity
- None
- Availability
- Partial
AV:N/AC:L/Au:N/C:N/I:N/A:P
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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Verify MDaemon is installedCheck for MDaemon installation by looking for the program directory (typically C:\MDaemon\ or C:\Program Files\MDaemon\), or check Windows Services for 'MDaemon' serviceAffected if MDaemon software is present on the system
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Identify the installed MDaemon versionLocate the version information - check the MDaemon GUI (Help > About), the registry key HKEY_LOCAL_MACHINE\SOFTWARE\Alt-N\MDaemon\CurrentVersion, or the file version of MDaemon.exe in the installation directoryAffected if The installed version is exactly 3.0.3 or 3.1_beta
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Confirm POP3 server is enabledIn MDaemon, go to Setup > Server > Protocols or check the configuration file (MDaemon.ini) for POP3Enable=Yes, or verify the POP3 service is listening on port 110Affected if POP3 server is enabled and listening for connections
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Check if POP3 is accessible remotelyVerify the POP3 port (110) is open to external connections by checking firewall rules, router port forwarding, or using a network port scanner against the server's external IPAffected if Port 110 (POP3) is exposed to untrusted networks
The environment is affected if MDaemon version 3.0.3 or 3.1_beta is running with the POP3 server enabled and accessible, as the buffer overflow vulnerability can be triggered during authentication with an excessively long username.
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 dataUpdate MDaemon to a version that includes the security patch for this vulnerability, or apply any available vendor-supplied patches.
- Consultation1.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2000-0399 — 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-2000-0399 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