CVE-2019-0007
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 vMX Series software uses a predictable IP ID Sequence Number. This leaves the system as well as clients connecting through the device susceptible to a family of attacks which rely on the use of predictable IP ID sequence numbers as their base method of attack. This issue was found during internal product security testing. Affected releases are Juniper Networks Junos OS: 15.1 versions prior to 15.1F5 on vMX Series.
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 vMX Series software implements a predictable IP ID sequence number generation mechanism. IP ID is a 16-bit field in the IP header used for fragmentation reassembly; when predictable, attackers can perform OS fingerprinting, blind TCP hijacking, injection attacks, and bypass network security filters by forging packets with valid sequence numbers.
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= 15.1CVSS 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
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/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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Confirm vMX Series hardwareRun 'show chassis hardware' or 'show system information' to verify the device model is vMX SeriesAffected if Device model shows vMX Series
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Check Junos OS versionRun 'show version' or 'show system information' to retrieve the installed Junos versionAffected if Version displays as exactly 15.1 (the affected version)
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Verify IP ID generation behaviorCapture egress IP packets and analyze the IP ID field (16-bit header field) across multiple packets to observe if values increment sequentially or predictably rather than appearing randomizedAffected if IP ID values follow a predictable increment pattern (such as sequential or simple increment)
If the device is a vMX Series running Junos 15.1 with observable predictable IP ID sequences in captured traffic, the environment is affected by this vulnerability.
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.
dbcve · scopedUpgrade Junos OS on vMX Series devices to version 15.1F5 or later, which implements randomized IP ID sequence number generation.
Junos OS 15.1F5 or later (on vMX Series)
- 1. Identify the current Junos OS version on the vMX Series device using 'show version'
- 2. Verify the device is a vMX Series (the fix is specific to vMX)
- 3. Download Junos OS version 15.1F5 or later from the Juniper Networks support portal
- 4. Upload the Junos OS upgrade package to the vMX device
- 5. Initiate the software installation using 'request system software add <package-name>'
- 6. Reboot the device using 'request system reboot'
- 7. After reboot, verify the new version is installed using 'show version'
- 8. Verify IP ID sequence numbers are now properly randomized (this may require checking with network tools or confirming with Juniper support)
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation4.0 h
- Testing8.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-0007 — 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-2019-0007 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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