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Nx OsOperating system · Cisco

CVE-2012-1357

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 igmp_snoop_orib_fill_source_update function in the IGMP process in NX-OS 5.0 and 5.1 on Cisco Nexus 5000 series switches allows remote attackers to cause a denial of service (device reload) via IGMP packets, aka Bug ID CSCts46521.

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 · moderate confidence

A vulnerability in the IGMP snooping function (igmp_snoop_orib_fill_source_update) in Cisco NX-OS 5.0 and 5.1 on Nexus 5000 series switches allows remote attackers to trigger a device reload by sending specially crafted IGMP packets. The flaw is in the IGMP process and causes a denial of service condition.

MitigationUpgrade Cisco NX-OS to a version beyond 5.1 (preferably the latest stable release). If immediate upgrade is not possible, consider disabling IGMP snooping if not required, or implementing ACLs to restrict IGMP traffic to trusted sources.

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
Nx OsOperating system
Affected:= 5.0= 5.1
Nexus 5000Hardware / appliance
Affected:all versions

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 version' or 'show inventory' to confirm the hardware is a Cisco Nexus 5000 series switch
    Affected if Device is not a Nexus 5000 series switch - not affected
  2. Check the NX-OS version
    Run 'show version' and look for the software version number. Confirm it is exactly 5.0 or 5.1
    Affected if NX-OS version is not 5.0 or 5.1 - not affected (version outside the vulnerable range)
  3. Verify IGMP snooping is enabled
    Run 'show ip igmp snooping' to check if IGMP snooping is enabled on the switch
    Affected if IGMP snooping is disabled - not vulnerable (the flaw requires IGMP snooping to be active)

The device is affected if it is a Cisco Nexus 5000 series switch running NX-OS version 5.0 or 5.1 with IGMP snooping currently enabled.

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 Cisco NX-OS to a version beyond 5.1 (preferably the latest stable release). If immediate upgrade is not possible, consider disabling IGMP snooping if not required, or implementing ACLs to restrict IGMP traffic to trusted sources.

Fix this in Nx Os Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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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-2012-1357 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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