CVE-2014-3817
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 · uneditedJuniper Junos 11.4 before 11.4R12, 12.1X44 before 12.1X44-D32, 12.1X45 before 12.1X45-D25, 12.1X46 before 12.1X46-D20, and 12.1X47 before 12.1X47-D10 on SRX Series devices, when NAT protocol translation from IPv4 to IPv6 is enabled, allows remote attackers to cause a denial of service (flowd hang or crash) via a crafted packet.
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 confidenceThis is a denial of service vulnerability in Juniper SRX Series devices. When NAT protocol translation from IPv4 to IPv6 is enabled, a remote attacker can send a crafted packet that causes the flowd process to hang or crash, resulting in service disruption.
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= 11.4= 12.1x44= 12.1x45= 12.1x46= 12.1x47all versionsall versionsall versionsall versionsall versionsall versionsall 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
- 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 the SRX device modelRun 'show chassis hardware' or 'show system information' to confirm the device is an SRX series modelAffected if Device model is Srx100, Srx110, Srx1400, Srx210, Srx220, Srx240, or Srx3400
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Check the Junos software versionRun 'show version' to obtain the installed Junos versionAffected if Version matches exactly 11.4, 12.1x44, 12.1x45, 12.1x46, or 12.1x47 (or any version of the listed SRX models regardless of Junos version)
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Verify if IPv4 to IPv6 NAT translation is configuredRun 'show configuration nat source' and look for NAT rule-sets with protocol translation from IPv4 to IPv6, or inspect the NAT configuration under 'set nat source pool' with 'family inet6'Affected if Any IPv4-to-IPv6 NAT protocol translation rule is active in the configuration
If the device is an affected SRX model AND IPv4-to-IPv6 NAT translation is enabled, the environment is vulnerable to CVE-2014-3817.
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 dataUpgrade Junos to version 11.4R12 or later, 12.1X44-D32 or later, 12.1X45-D25 or later, 12.1X46-D20 or later, or 12.1X47-D10 or later. As a temporary mitigation, consider disabling IPv4 to IPv6 NAT protocol translation if not required.
- Consultation4.0 h
- Implementation4.0 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-2014-3817 — 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-2014-3817 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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- Version or environment caveats, and links to real fixes
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