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Fabric Operating SystemOperating system · Broadcom

CVE-2017-6227

MEDIUM · 6.5 CVSS v3.0 Published 2018-02-08
Fix available
A fix is available. Upgrade to 7.4.2b or later.
See remediation →
70/100
Remediation priority · Elevated
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
A vulnerability in the IPv6 stack on Brocade Fibre Channel SAN products running Brocade Fabric OS (FOS) versions before 7.4.2b, 8.1.2 and 8.2.0 could allow an attacker to cause a denial of service (CPU consumption and device hang) condition by sending crafted Router Advertisement (RA) messages to a targeted system.

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

A denial-of-service vulnerability exists in the IPv6 stack of Brocade Fabric OS on Fibre Channel SAN products. Attackers can send specially crafted Router Advertisement (RA) messages to affected systems, triggering excessive CPU consumption that causes the device to hang and become unavailable.

MitigationUpgrade Brocade Fabric OS to version 7.4.2b, 8.1.2, 8.2.0 or later. If IPv6 is not required in the environment, it can be disabled as a workaround until patching is completed.

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
Fabric Operating SystemOperating system
Affected:< 7.4.2b= 8.0.0= 8.0.1= 8.0.2= 8.1.0= 8.1.1= 8.1.2
Fabric OsOperating system
Affected:= 8.0.2b2

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

CVSS:3.0/AV:A/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 checks

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

  1. Determine Fabric OS version
    Run the 'version' command on the Fabric OS CLI or check via management interface (web GUI or SNMP)
    Affected if The installed version is < 7.4.2b, or equals 8.0.0, 8.0.1, 8.0.2, 8.1.0, 8.1.1, 8.1.2, or 8.0.2b2
  2. Verify IPv6 is enabled
    Run 'ipv6 --show' or check the IPv6 configuration via Fabric OS management interface
    Affected if IPv6 is enabled on the device (the vulnerability only triggers when IPv6 stack is active)
  3. Confirm IPv6 network exposure
    Check if the management or FC ports are reachable via IPv6 from untrusted networks; review network segmentation and firewall rules
    Affected if The device's IPv6 interfaces are accessible to external hosts (Router Advertisement messages must be received to trigger the DoS)

The device is affected if it runs a vulnerable Fabric OS version listed above AND has IPv6 enabled and reachable on the network.

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
Upgrade available Upgrade to 7.4.2b or later
Fixed in 7.4.2b
Interim mitigation

Upgrade Brocade Fabric OS to version 7.4.2b, 8.1.2, 8.2.0 or later. If IPv6 is not required in the environment, it can be disabled as a workaround until patching is completed.

Fix this in Fabric Operating System Scoped from the published advisory
  • Consultation6.0 h
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
16.0 hours of engineering $2,880
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Scan for this in your stack

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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-2017-6227 in production — separate from our analysis above.

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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
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data