CVE-2007-3803
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 · uneditedThe SMTP ALG in Clavister CorePlus before 8.80.04, and 8.81.00, does not properly parse SMTP commands in certain circumstances, which allows remote attackers to bypass address blacklists.
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 Application Layer Gateway (ALG) in Clavister CorePlus versions prior to 8.80.04 and 8.81.00 fails to properly parse SMTP commands under certain conditions, enabling remote attackers to circumvent address blacklists configured on the firewall.
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<= 8.80.03<= 8.81.00CVSS 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
- Complete
- Integrity
- Complete
- Availability
- Complete
AV:N/AC:L/Au:N/C:C/I:C/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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Identify the installed productConfirm the device runs Clavister CorePlus firmware - typically via system info command, web UI dashboard, or CLI 'system info' outputAffected if Product is Clavister CorePlus and version is <= 8.80.03 or <= 8.81.00
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Check the firmware versionRetrieve the exact version number from the firewall management interface or CLI command such as 'version' or 'system version'Affected if Version number is 8.80.03 or earlier, or 8.81.00 or earlier
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Verify SMTP ALG is enabledAccess the firewall configuration and inspect the Application Layer Gateway (ALG) settings - look for SMTP ALG or mail proxy settings in the security policy or ALG configuration sectionAffected if SMTP ALG is enabled and the version is in the affected range
You are affected if the device runs Clavister CorePlus with version 8.80.03 or earlier (or 8.81.00 or earlier) and has the SMTP ALG feature enabled in your firewall configuration.
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.
dbcve · scopedUpgrade Clavister CorePlus to version 8.80.04 or later (or 8.81.00) to patch the SMTP ALG parsing vulnerability.
Clavister CorePlus 8.80.04 or later (or latest stable release above 8.81.00)
- 1. Identify the current Clavister CorePlus version installed
- 2. If running version 8.80.03 or earlier, upgrade to version 8.80.04 or later
- 3. If running version 8.81.00, upgrade to a version higher than 8.81.00 (preferably the latest stable release)
- 4. After upgrade, verify the SMTP ALG is functioning correctly and blacklist filtering is working
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation3.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,512.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2007-3803 — 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-2007-3803 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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