CVE-2014-7255
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 · uneditedInternet Initiative Japan Inc. SEIL Series routers SEIL/X1 2.50 through 4.62, SEIL/X2 2.50 through 4.62, SEIL/B1 2.50 through 4.62, and SEIL/x86 Fuji 1.70 through 3.22 allow remote attackers to cause a denial of service (CPU and traffic consumption) via a large number of NTP requests within a short time, which causes unnecessary NTP responses to be sent.
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 (SEIL/X1 2.50-4.62, SEIL/X2 2.50-4.62, SEIL/B1 2.50-4.62, SEIL/x86 Fuji 1.70-3.22) are vulnerable to an NTP amplification/reflection denial of service. Attackers send large numbers of NTP requests, causing the routers to generate excessive NTP responses that consume CPU and network bandwidth.
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>= 2.50, <= 4.62>= 2.50, <= 4.62>= 2.50, <= 4.62>= 1.70, <= 3.22CVSS 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
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 SEIL router firmware versionAccess the router administrative interface or console and retrieve the current firmware version information. This is typically found in the system status, information, or firmware upgrade section of the web UI or CLI.Affected if The firmware version falls within 2.50 to 4.62 for SEIL/X1, SEIL/X2, or SEIL/B1 models, or within 1.70 to 3.22 for SEIL/x86 Fuji models.
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Confirm NTP service is enabledCheck the router configuration for NTP settings. Look for NTP client or server configuration in the router administrative interface under system settings, time settings, or network services.Affected if NTP service is enabled on the router.
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Verify NTP service accessibilityDetermine if UDP port 123 (NTP) is open and reachable from external or untrusted networks. This can be done by scanning the router's public IP address or external interface for port 123 accessibility, or by reviewing firewall/access control rules.Affected if The NTP service is accessible from untrusted or external network segments.
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Check for NTP configuration allowingmonlist queriesReview NTP configuration settings to determine if the monlist or similar NTP protocol features that enable amplification are available. This is typically a default behavior in vulnerable NTP implementations.Affected if The NTP service is enabled and responds to requests that can be used for amplification.
A user is affected if the router runs a firmware version within the affected ranges AND has NTP service enabled and accessible from untrusted networks, allowing it to be exploited for NTP amplification attacks.
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 NTP service rate limiting, restrict NTP access to trusted sources, or apply vendor firmware updates that address this vulnerability.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2014-7255 — 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-2014-7255 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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