CVE-2017-2348
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 Juniper Enhanced jdhcpd daemon may experience high CPU utilization, or crash and restart upon receipt of an invalid IPv6 UDP packet. Both high CPU utilization and repeated crashes of the jdhcpd daemon can result in a denial of service as DHCP service is interrupted. No other Juniper Networks products or platforms are affected by this issue. Affected releases are Juniper Networks Junos OS 14.1X53 prior to 14.1X53-D12, 14.1X53-D38, 14.1X53-D40 on QFX, EX, QFabric System; 15.1 prior to 15.1F2-S18, 15.1R4 on all products and platforms; 15.1X49 prior to 15.1X49-D80 on SRX; 15.1X53 prior to 15.1X53-D51, 15.1X53-D60 on NFX, QFX, EX.
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 confidenceThe Juniper Enhanced jdhcpd daemon contains a vulnerability where receipt of an invalid IPv6 UDP packet causes either high CPU utilization or a crash and restart of the daemon, resulting in denial of DHCP service.
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= 14.1x53= 15.1= 15.1x49= 15.1x53CVSS 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:3.0/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 Junos OS versionRun 'show version' on the device CLI and locate the Junos OS release numberAffected if The installed version matches 14.1X53, 15.1, 15.1X49, or 15.1X53 (any subversion)
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Confirm the jdhcpd daemon is runningRun 'show system processes extensive | match jdhcpd' or 'show system services dhcp'Affected if The enhanced jdhcpd daemon is active on the device
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Check if IPv6 is enabled on any interfaceRun 'show ipv6 neighbors' or 'show interfaces' and look for IPv6 configurationAffected if IPv6 is enabled on any interface, as the flaw is triggered by invalid IPv6 UDP packets
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Look for jdhcpd crash or restart eventsRun 'show log messages' and search for 'jdhcpd' entries, or check 'show system core-dumps'Affected if Recent crashes, restarts, or high CPU events for jdhcpd are logged, especially with IPv6-related causes
A user is affected if the device runs a vulnerable Junos version (14.1X53, 15.1, 15.1X49, or 15.1X53), has the enhanced jdhcpd daemon running, and has IPv6 enabled or has already observed jdhcpd crashes triggered by malformed IPv6 UDP packets.
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 OS to the specified patched versions (14.1X53-D40, 15.1F2-S18, 15.1R4, 15.1X49-D80, 15.1X53-D60) or later for the affected platform.
- Consultation4.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2017-2348 — 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-2017-2348 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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