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Nx OsOperating system · Cisco

CVE-2018-0292

HIGH · 8.8 CVSS v3.0 Published 2018-06-20
Fix available
A fix is available. Upgrade to 7.0 / 7.3 or later.
See remediation →
93/100
Remediation priority · Urgent
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 Internet Group Management Protocol (IGMP) Snooping feature of Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to execute arbitrary code and gain full control of an affected system. The attacker could also cause an affected system to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to a buffer overflow condition in the IGMP Snooping subsystem. An attacker could exploit this vulnerability by sending crafted IGMP packets to an affected system. An exploit could allow the attacker to execute arbitrary code and gain full control of the affected system or cause the affected system to reload, resulting in a DoS condition. This vulnerability affects Nexus 2000 Series Switches, Nexus 3000 Series Switches, Nexus 3500 Platform Switches, Nexus 3600 Platform Switches, Nexus 5500 Platform Switches, Nexus 5600 Platform Switches, Nexus 6000 Series Switches, Nexus 7000 Series Switches, Nexus 7700 Series Switches, Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode, Nexus 9000 Series Switches in standalone NX-OS mode. Cisco Bug IDs: CSCuv79620, CSCvg71263.

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 Cisco NX-OS IGMP Snooping feature allows unauthenticated adjacent attacker to execute arbitrary code or cause DoS via crafted IGMP packets. Affects Nexus switch series 2000-9000 in various deployment modes.

MitigationApply Cisco-supplied patches/firmware updates; alternatively, disable IGMP Snooping if not required, or implement network segmentation to restrict IGMP traffic to trusted segments.

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:>= 6.0, < 7.3\(3\)n1\(1\)>= 6.2, < 8.1\(2\)>= 12.1, < 13.1\(1i\)<= 7.0\(3\)i4>= 7.0\(3\)i5, < 7.0\(3\)i7\(1\)

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
High
Integrity
High
Availability
High

CVSS:3.0/AV:A/AC:L/PR:N/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. Identify the Nexus switch model
    Run 'show version' or check the device model to confirm it is a Cisco Nexus switch in the 2000-9000 series
    Affected if Device is a Nexus 2000, 3000, 5000, 7000, 9000 series switch
  2. Check the NX-OS software version
    Run 'show version' command and note the NX-OS release number (for example, 7.0(3)i7(2))
    Affected if Version falls within any of these ranges: >= 6.0 and < 7.3(3)n1(1); >= 6.2 and < 8.1(2); >= 12.1 and < 13.1(1i); <= 7.0(3)i4; >= 7.0(3)i5 and < 7.0(3)i7(1)
  3. Verify if IGMP Snooping is enabled
    Run 'show ip igmp snooping' or 'show ip igmp snooping vlan <vlan_id>' to check IGMP Snooping status
    Affected if IGMP Snooping is enabled on any VLAN (the vulnerability is only exploitable when IGMP Snooping is active)
  4. Confirm IGMP Snooping configuration persistence
    Run 'show running-config | include igmp snooping' to review the IGMP Snooping configuration in the active config
    Affected if IGMP Snooping is configured and will be active on device reload

You are affected if you run a Nexus 2000-9000 switch with a vulnerable NX-OS version AND IGMP Snooping is enabled on your device.

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 7.0 / 7.3 / 8.1 or later
Fixed in 7.07.38.1
Interim mitigation

Apply Cisco-supplied patches/firmware updates; alternatively, disable IGMP Snooping if not required, or implement network segmentation to restrict IGMP traffic to trusted segments.

Fix this in Nx Os Scoped from the published advisory
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing8.0 h
  • Review / QA4.0 h
30.0 hours of engineering $5,280
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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-2018-0292 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