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JunosOperating system · Juniper

CVE-2016-1260

MEDIUM · 5.3 CVSS v3.0 Published 2016-01-15
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
62/100
Remediation priority · Elevated
Remotely reachable No privileges 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
Juniper Junos OS before 13.2X51-D36, 14.1X53 before 14.1X53-D25, and 15.2 before 15.2R1 on EX4300 series switches allow remote attackers to cause a denial of service (network loop and bandwidth consumption) via unspecified vectors related to Spanning Tree Protocol (STP) traffic.

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

Juniper EX4300 switches running Junos OS versions before 13.2X51-D36, 14.1X53-D25, and 15.2R1 contain a vulnerability in Spanning Tree Protocol (STP) processing. Attackers can send crafted STP packets that cause a network loop, resulting in bandwidth consumption and denial of service.

MitigationUpgrade Junos OS on affected EX4300 switches to the fixed versions (13.2X51-D36, 14.1X53-D25, or 15.2R1 and later). Consider enabling BPDU guard or loop protect features on access ports as an additional layer of defense while planning the upgrade.

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:= 13.2x51= 14.1x53= 15.2

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
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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. Determine the Junos OS version
    Execute 'show version' on the EX4300 switch CLI to retrieve the installed Junos OS version string
    Affected if The version shown is earlier than 13.2X51-D36, 14.1X53-D25, or 15.2R1
  2. Confirm the EX4300 model
    Execute 'show chassis hardware' to verify the device model is EX4300
    Affected if The device is an EX4300 switch
  3. Check if STP is enabled
    Execute 'show spanning-tree bridge' or 'show protocols spanning-tree' to determine if Spanning Tree Protocol is active on any interfaces
    Affected if STP is enabled and running on the switch

The switch is affected if it is an EX4300 running a Junos version before 13.2X51-D36, 14.1X53-D25, or 15.2R1 AND has STP enabled on any interface.

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

Upgrade Junos OS on affected EX4300 switches to the fixed versions (13.2X51-D36, 14.1X53-D25, or 15.2R1 and later). Consider enabling BPDU guard or loop protect features on access ports as an additional layer of defense while planning the upgrade.

Fix this in Junos Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,130
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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-2016-1260 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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