dbcve.org
Mds 9000 Nx OsOperating system · Cisco

CVE-2012-1340

MEDIUM · 5.0 CVSS v2.0 Published 2012-08-06
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
59/100
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
The Fibre Channel over IP (FCIP) implementation in Cisco MDS NX-OS 4.2 and 5.2 on MDS 9000 series switches allows remote attackers to cause a denial of service (module reload) via a crafted FCIP header, aka Bug ID CSCtn93151.

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

The FCIP (Fibre Channel over IP) implementation in Cisco MDS NX-OS versions 4.2 and 5.2 on MDS 9000 series switches contains a vulnerability where a remote attacker can send a specially crafted FCIP packet with malicious header contents, causing the affected module to reload and resulting in denial of service.

MitigationUpgrade to a patched version of Cisco MDS NX-OS (contact Cisco for specific fixed versions). If immediate upgrade is not feasible, restrict FCIP traffic to trusted sources using network filtering at perimeter devices.

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
Mds 9000 Nx OsOperating system
Affected:= 4.2= 5.2

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
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial

AV:N/AC:L/Au:N/C:N/I:N/A:P

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. Identify the device model
    Run 'show module' or 'show inventory' command to confirm the device is a Cisco MDS 9000 series switch
    Affected if Device is not an MDS 9000 series switch
  2. Check the NX-OS version
    Run 'show version' command and locate the NX-OS software version number
    Affected if Version is 4.2(x) or 5.2(x) where x is any subversion number
  3. Verify FCIP is enabled
    Run 'show fcip status' or 'show running-config | include fcip' to check if FCIP feature is configured and active
    Affected if FCIP is enabled and there is at least one FCIP interface configured
  4. Check FCIP interface configuration
    Run 'show fcip interface' to list active FCIP interfaces and their status
    Affected if Any FCIP interface exists and is operational

A user is affected if they are running NX-OS version 4.2 or 5.2 on a Cisco MDS 9000 series switch with FCIP feature enabled and configured.

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 to a patched version of Cisco MDS NX-OS (contact Cisco for specific fixed versions). If immediate upgrade is not feasible, restrict FCIP traffic to trusted sources using network filtering at perimeter devices.

Fix this in Mds 9000 Nx Os 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-2012-1340 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
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data