CVE-2004-2583
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 · uneditedSMTP service in SmarterTools SmarterMail 1.6.1511 and 1.6.1529 allows remote attackers to cause a denial of service (CPU consumption) via a large number of simultaneous open connections to TCP port 25.
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 confidenceThe SMTP service in SmarterTools SmarterMail versions 1.6.1511 and 1.6.1529 lacks proper connection limits, allowing remote attackers to consume CPU resources by opening a large number of simultaneous TCP connections to port 25, 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= 1.6.1511= 1.6.1529CVSS 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
- Complete
AV:N/AC:L/Au:N/C:N/I:N/A:C
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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Locate SmarterMail installation and versionCheck the installed SmarterMail version by examining the program files directory, registry keys, or the service information. Common paths include C:\Program Files\SmarterTools\SmarterMail\ or check Windows Services for 'SmarterMail' service properties.Affected if The installed version is exactly 1.6.1511 or 1.6.1529
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Verify SMTP service is running on port 25Open a command prompt and run 'netstat -an | findstr :25' or use a port scanner to confirm TCP port 25 is listening. Also check if the SmarterMail SMTP service is listed as running in Windows Services.Affected if The SmarterMail SMTP service is active and listening on TCP port 25
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Check current connection limit configurationInspect the SmarterMail configuration files (typically in the Mail folder or via the admin interface) for connection limit, throttle, or max connections settings. Look for SMTP-related settings that restrict simultaneous connections.Affected if No connection limits are configured for the SMTP service, meaning unlimited simultaneous connections are allowed
You are affected if SmarterMail version 1.6.1511 or 1.6.1529 is installed with the SMTP service running on port 25 and no connection limits are configured.
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 connection rate limiting on the SMTP service or configure firewall/network-level connection throttling to restrict simultaneous connections per source IP.
- Consultation1.0 h
- Implementation2.0 h
- Testing1.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2004-2583 — 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-2004-2583 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