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JunosOperating system · Juniper

CVE-2017-2344

HIGH · 7.8 CVSS v3.0 Published 2017-07-17
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
80/100
Remediation priority · High
Zero-click

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 · unedited
A routine within an internal Junos OS sockets library is vulnerable to a buffer overflow. Malicious exploitation of this issue may lead to a denial of service (kernel panic) or be leveraged as a privilege escalation through local code execution. The routines are only accessible via programs running on the device itself, and veriexec restricts arbitrary programs from running on Junos OS. There are no known exploit vectors utilizing signed binaries shipped with Junos OS itself. Affected releases are Juniper Networks Junos OS 12.1X46 prior to 12.1X46-D67; 12.3X48 prior to 12.3X48-D51, 12.3X48-D55; 13.3 prior to 13.3R10-S2; 14.1 prior to 14.1R2-S10, 14.1R8-S4, 14.1R9; 14.1X50 prior to 14.1X50-D185; 14.1X53 prior to 14.1X53-D122, 14.1X53-D45, 14.1X53-D50; 14.2 prior to 14.2R4-S9, 14.2R7-S7, 14.2R8; 15.1 prior to 15.1F2-S18, 15.1F6-S7, 15.1R4-S8, 15.1R5-S5, 15.1R6-S1, 15.1R7; 15.1X49 prior to 15.1X49-D100; 15.1X53 prior to 15.1X53-D231, 15.1X53-D47, 15.1X53-D48, 15.1X53-D57, 15.1X53-D64, 15.1X53-D70; 16.1 prior to 16.1R3-S4, 16.1R4-S3, 16.1R4-S4, 16.1R5; 16.2 prior to 16.2R2; 17.1 prior to 17.1R1-S3, 17.1R2; 17.2 prior to 17.2R1-S1, 17.2R2; 17.2X75 prior to 17.2X75-D30. 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 confidence

Buffer overflow vulnerability in an internal Junos OS sockets library routine. Exploitation can cause kernel panic (denial of service) or enable privilege escalation through local code execution. However, exploitation is constrained because the vulnerable routines are only accessible by programs running on the device itself, and Junos OS's veriexec mechanism restricts arbitrary program execution. No exploit vectors using signed Junos binaries are known.

MitigationApply the vendor-supplied Junos OS patches for affected versions (12.1X46-D67+, 12.3X48-D51+, 13.3R10-S2+, etc.) after assessing current version and planning appropriate maintenance window.

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
JunosOperating system
Affected:= 12.1x46= 12.3x48= 13.3= 14.1= 14.1x50= 14.1x53= 14.2= 15.1= 15.1x49= 15.1x53= 16.1= 16.2

CVSS 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
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/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 checks

Work through these to decide whether this CVE applies to you.

  1. Check Junos OS version
    Execute 'show version' on the device CLI to display the installed Junos OS version and build number
    Affected if The displayed version matches one of the affected branches: 12.1X46, 12.3X48, 13.3, 14.1, 14.1X50, 14.1X53, 14.2, 15.1, 15.1X49, 15.1X53, 16.1, or 16.2, and the build is earlier than the fixed patch level (12.1X46-D67+, 12.3X48-D51+, 13.3R10-S2+, etc.)
  2. Identify patch level
    Execute 'show system software' or 'show version detail' to view the installed Junos patch level and compare against the fixed versions listed in the CVE advisory
    Affected if The installed patch level is lower than the vendor-supplied patches for your version branch (e.g., below D67 for 12.1X46, below D51 for 12.3X48, etc.)
  3. Verify if vulnerable socket library module is present
    This is an internal library component; the primary indicator is the version/patch level checked above, as the specific sockets library routine is not user-accessible for inspection
    Affected if Version and patch status matches the affected but unpatched condition from steps 1 and 2
  4. Confirm local execution context
    Review audit logs and verify that no unauthorized local programs have been installed on the device using 'file list' or similar commands to check for unexpected binaries in /var/tmp or other local directories
    Affected if Unexpected local programs exist on the device, as exploitation requires local code execution to reach the vulnerable internal sockets library routines

The device is affected if it runs an unpatched Junos version from the 12.1X46, 12.3X48, 13.3, 14.1, 14.1X50, 14.1X53, 14.2, 15.1, 15.1X49, 15.1X53, 16.1, or 16.2 branches that has not received the vendor-supplied security patches.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply the vendor-supplied Junos OS patches for affected versions (12.1X46-D67+, 12.3X48-D51+, 13.3R10-S2+, etc.) after assessing current version and planning appropriate maintenance window.

Fix this in Junos Scoped from the published advisory
  • Consultation4.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,640
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2017-2344 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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