dbcve.org
Nx OsOperating system · Cisco

CVE-2018-0092

HIGH · 7.1 CVSS v3.0 Published 2018-01-18
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
73/100
Remediation priority · Elevated
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 network-operator user role implementation for Cisco NX-OS System Software could allow an authenticated, local attacker to improperly delete valid user accounts. The network-operator role should not be able to delete other configured users on the device. The vulnerability is due to a lack of proper role-based access control (RBAC) checks for the actions that a user with the network-operator role is allowed to perform. An attacker could exploit this vulnerability by authenticating to the device with user credentials that give that user the network-operator role. Successful exploitation could allow the attacker to impact the integrity of the device by deleting configured user credentials. The attacker would need valid user credentials for the device. This vulnerability affects the following Cisco products running Cisco NX-OS System Software: Nexus 3000 Series Switches, Nexus 3600 Platform Switches, Nexus 9000 Series Switches in standalone NX-OS mode, Nexus 9500 R-Series Line Cards and Fabric Modules. Cisco Bug IDs: CSCvg21120.

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 vulnerability in Cisco NX-OS System Software allows users with the network-operator role to delete valid user accounts, which should not be permitted. The issue stems from missing RBAC (role-based access control) checks that should restrict the network-operator role from performing user management actions. An authenticated attacker with network-operator credentials can delete other configured user accounts, impacting system integrity.

MitigationApply the Cisco patch for CSCvg21120 to affected Nexus switch models. Until patched, limit network-operator role assignments to trusted personnel and monitor for unauthorized user account deletions.

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:= 7.0\(3\)i5\(2\)= 7.0\(3\)i6\(1\)= 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
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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 NX-OS version
    Run 'show version' on the Nexus switch CLI to retrieve the installed software version
    Affected if The version displayed matches 7.0(3)i5(2), 7.0(3)i6(1), or 7.0(3)i7(1)
  2. Verify network-operator role exists
    Run 'show role' or 'show role name network-operator' to confirm the network-operator role is defined in the system
    Affected if The network-operator role is present and active in the NX-OS configuration
  3. Check RBAC for user management commands
    Run 'show role capability' or 'show role detail network-operator' to inspect which commands the network-operator role can execute
    Affected if The network-operator role has permission to run user management commands such as 'username' or 'user' operations
  4. Audit recent user account deletions
    Review system logs, accounting logs, or run 'show logging last 24 hours | include username' to look for user account deletion events
    Affected if User accounts were deleted by an account with network-operator role

You are affected if your NX-OS version is 7.0(3)i5(2), 7.0(3)i6(1), or 7.0(3)i7(1) and users with the network-operator role can access user management functions.

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

Apply the Cisco patch for CSCvg21120 to affected Nexus switch models. Until patched, limit network-operator role assignments to trusted personnel and monitor for unauthorized user account deletions.

Fix this in Nx Os Scoped from the published advisory
  • Consultation2.0 h
  • Testing3.0 h
  • Review / QA2.0 h
7.0 hours of engineering $1,210
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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-2018-0092 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
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  • Version or environment caveats, and links to real fixes
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