CVE-2009-4292
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 the URL filtering function in Internet Initiative Japan SEIL/X1, SEIL/X2, and SEIL/B1 firmware 2.40 through 2.51 allows remote attackers to execute arbitrary code via unspecified vectors.
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 the URL filtering function of Internet Initiative Japan SEIL/X1, SEIL/X2, and SEIL/B1 firewall appliances running firmware versions 2.40 through 2.51. The overflow allows remote attackers to execute arbitrary code via unspecified vectors, likely through malformed URL requests processed by the filtering engine.
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= 2.40= 2.41= 2.42= 2.50= 2.51all versions= 2.40= 2.41= 2.42= 2.50= 2.51all versions= 2.40= 2.41= 2.42= 2.50= 2.51all versionsCVSS 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
- M
- Authentication
- None
- Confidentiality
- Complete
- Integrity
- Complete
- Availability
- Complete
AV:N/AC:M/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 SEIL appliance model and firmware versionAccess the device CLI via console or SSH and run the command to display system information, typically 'show version' or 'system show'. Alternatively, log into the web management interface and check the status or firmware version page.Affected if The displayed firmware version is 2.40, 2.41, 2.42, 2.50, or 2.51, or falls within the range 2.40 through 2.51.
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Locate URL filtering configurationIn the CLI, navigate to the URL filtering or proxy configuration section using commands such as 'show config url-filter' or 'show url-filter'. In the web interface, look under Security, Filter, or URL Filtering settings.Affected if URL filtering configuration exists and is present on the device.
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Confirm URL filtering is enabledExamine the output from the previous step to determine if URL filtering is actively enabled. Look for keywords such as 'enabled', 'active', or 'on' in the filtering status. In the web interface, verify the URL filter is toggled to ON or enabled.Affected if URL filtering is enabled or configured to process traffic.
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Check for unknown or malformed URL handling exposureReview the URL filtering logs or traffic logs for any anomalies, malformed URLs, or unexpected processing behavior. Use 'show log url-filter' or similar command if available.Affected if The device is processing URL filtering logs, indicating the feature is actively being used on network traffic.
The device is affected if it is an IIJ SEIL/X1, SEIL/X2, or SEIL/B1 appliance running firmware version 2.40 through 2.51 with URL filtering enabled or 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 dataApply vendor firmware update beyond version 2.51; if unavailable, consider network segmentation or compensating controls to limit exposure to the URL filtering interface.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2009-4292 — 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-2009-4292 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
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