CVE-2014-7256
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 (1) PPP Access Concentrator (PPPAC) and (2) Dial-Up Networking Internet Initiative Japan Inc. SEIL series routers SEIL/x86 Fuji 1.00 through 3.22; SEIL/X1, SEIL/X2, and SEIL/B1 1.00 through 4.62; SEIL/Turbo 1.82 through 2.18; and SEIL/neu 2FE Plus 1.82 through 2.18 allow remote attackers to cause a denial of service (restart) via crafted (a) GRE or (b) MPPE packets.
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 confidenceSEIL series routers and PPPAC devices contain a vulnerability in their handling of GRE and MPPE packets. Remote attackers can send specially crafted packets causing the device to restart, resulting in denial of service. The vulnerability affects multiple firmware versions across several router models.
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= 1.82= 1.83= 1.84= 1.85= 1.86= 1.87= 1.88= 1.89= 1.90= 1.91= 1.92= 1.93all versions<= 4.61<= 4.61= 1.82= 1.83= 1.84= 1.85= 1.86= 1.87= 1.88= 1.89= 1.90= 1.91= 1.92= 1.93all versions<= 3.21<= 4.61CVSS 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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Identify SEIL router modelLog into the router administrative interface or check hardware labeling to determine the exact SEIL model (Plus, Plus Firmware, B1, X1, Turbo, X86 Fuji, or X2).Affected if The model is any of: Iij Seil Plus, Iij Seil B1, Iij Seil X1, Iij Seil Turbo, Iij Seil X86 Fuji, or Iij Seil X2.
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Check firmware versionAccess router CLI or web interface and retrieve the firmware version (typically via 'show version' command or system status page). Compare against affected ranges: Seil Plus/B1/X1/Turbo/X2 firmware <=4.61, Seil Plus/Turbo (non-firmware) all versions, Seil X86 Fuji <=3.21, Seil Plus/Turbo firmware specific versions 1.82-1.93.Affected if Firmware version falls within or below the affected ranges listed for your specific model.
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Verify GRE protocol configurationCheck router configuration for GRE tunnel interfaces or passthrough settings (look for 'gre', 'tunnel', or 'proxy-gre' in running config or web interface under interface or tunnel settings).Affected if GRE protocol is enabled or configured on the device.
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Verify MPPE configurationCheck router configuration for MPPE (Microsoft Point-to-Point Encryption) settings, typically found in VPN or PPP configuration sections (look for 'mppe', 'pptp', or 'vpn' settings).Affected if MPPE encryption or PPTP VPN with MPPE is enabled.
A defender is affected if they run any SEIL router model with firmware matching the affected versions AND have GRE or MPPE protocols enabled in their 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.
From vendor dataApply vendor patches from Internet Initiative Japan Inc. for the affected firmware versions. If patches are unavailable, implement network-level filtering for unusual GRE/MPPE traffic patterns or isolate affected devices behind additional security controls.
- Consultation2.0 h
- Implementation3.0 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-2014-7256 — 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-2014-7256 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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