CVE-2014-6449
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 OS before 12.1X44-D50, 12.1X46 before 12.1X46-D35, 12.1X47 before 12.1X47-D25, 12.3 before 12.3R10, 12.3X48 before 12.3X48-D15, 13.2 before 13.2R8, 13.3 before 13.3R7, 14.1 before 14.1R5, and 14.2 before 14.2R1 do not properly handle TCP packet reassembly, which allows remote attackers to cause a denial of service (buffer consumption) via a crafted sequence of packets "destined to the device."
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 confidenceJunos OS contains a flaw in TCP packet reassembly handling where crafted sequences of packets destined to the device can cause excessive buffer consumption, leading to denial of service. The vulnerability is remotely exploitable without authentication.
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= 12.1x44= 12.1x46= 12.1x47= 12.3= 12.3x48= 13.2= 13.3= 14.1= 14.2CVSS 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
- Partial
AV:N/AC:L/Au:N/C:N/I:N/A:P
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 Junos versionExecute 'show version' or 'show version detail' via CLI or configuration managementAffected if Version output matches any of: 12.1x44, 12.1x46, 12.1x47, 12.3, 12.3x48, 13.2, 13.3, 14.1, or 14.2
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Confirm TCP reassembly is activeTCP packet reassembly is a built-in function of the Junos OS network stack; no explicit configuration required; verify interfaces are up with 'show interface terse'Affected if Any interface is in up state and processing traffic
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Check network exposure to unauthenticated TCPReview firewall filters, security zones, or access control lists with 'show configuration firewall' or 'show security'Affected if Untrusted network sources can send TCP packets directly to the device without authentication
Device is affected if running any of the listed versions AND has TCP interfaces reachable from untrusted networks
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 the vendor-supplied patches for affected versions (12.1X44-D50+, 12.1X46-D35+, 12.1X47-D25+, 12.3R10+, 12.3X48-D15+, 13.2R8+, 13.3R7+, 14.1R5+, 14.2R1+). If patching is not immediately feasible, consider network-level filtering to limit unauthenticated TCP traffic to critical devices.
- Consultation2.0 h
- Implementation4.0 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-2014-6449 — 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-2014-6449 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
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