CVE-2016-4925
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 · uneditedReceipt of a specifically malformed IPv6 packet processed by the router may trigger a line card reset: processor exception 0x68616c74 (halt) in task: scheduler. The line card will reboot and recover without user interaction. However, additional specifically malformed packets may cause follow-on line card resets and lead to an extended service outage. This issue only affects E Series routers with IPv6 licensed and enabled. Routers not configured to process IPv6 traffic are unaffected by this vulnerability. Juniper SIRT is not aware of any malicious exploitation of this vulnerability. No other Juniper Networks products or platforms are affected by this issue.
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 confidenceA specifically malformed IPv6 packet processed by Juniper E Series routers with IPv6 enabled triggers a processor exception (0x68616c74/halt) in the scheduler task, causing a line card reset. Repeated malformed packets can cause repeated resets leading to extended service outages.
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>= 10.3, <= 10.3.3>= 12.3.0, <= 12.3.3>= 13.3.0, <= 13.3.3>= 14.3.0, <= 14.3.1CVSS 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 device modelRun 'show version' or check the router hardware label to confirm it is a Juniper E Series router or Junos-based deviceAffected if Device is not a Juniper E Series or Junose platform - not affected
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Check the Junose software versionRun 'show version' to display the installed Junose software version numberAffected if Version falls outside all affected ranges: 10.3.x, 12.3.x, 13.3.x, 14.3.0-14.3.1 - not affected; version is in any of these ranges - potentially affected
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Verify IPv6 is enabledRun 'show ipv6 interface' or 'show configuration protocols ipv6' to check if IPv6 protocol is configured and enabled on any interfaceAffected if IPv6 is disabled globally or on all interfaces - not affected; IPv6 is enabled - potentially affected
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Confirm IPv6 is actively processing trafficRun 'show ipv6 traffic' or check interface statistics for IPv6 packet countersAffected if IPv6 is enabled but no traffic is being processed - lower exposure; IPv6 is enabled and actively processing packets - at risk
Device is affected only if it is a Juniper E Series/Junose router running a version in the 10.3.x, 12.3.x, 13.3.x, or 14.3.0-14.3.1 range AND has IPv6 enabled and processing traffic.
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 dataDisable IPv6 on E Series routers if not required, or apply Juniper-provided patches/updates for this vulnerability.
- Consultation3.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2016-4925 — 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-2016-4925 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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