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Nx OsOperating system · Cisco

CVE-2018-0293

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 →
94/100
Remediation priority · Urgent
Remotely reachable 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 role-based access control (RBAC) for Cisco NX-OS Software could allow an authenticated, remote attacker to execute CLI commands that should be restricted for a nonadministrative user. The attacker would have to possess valid user credentials for the device. The vulnerability is due to incorrect RBAC privilege assignment for certain CLI commands. An attacker could exploit this vulnerability by authenticating to a device as a nonadministrative user and executing specific commands from the CLI. An exploit could allow the attacker to run commands that should be restricted to administrative users. These commands could modify the configuration or boot image on the device. This vulnerability affects MDS 9000 Series Multilayer Switches, 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 Switches in standalone NX-OS mode, Nexus 9500 R-Series Line Cards and Fabric Modules. Cisco Bug IDs: CSCvd77904.

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 the role-based access control (RBAC) implementation of Cisco NX-OS Software allows authenticated non-administrative users to execute CLI commands that should be restricted to administrative users due to incorrect RBAC privilege assignment for certain CLI commands. This could enable an attacker with valid non-admin credentials to modify device configuration or boot images.

MitigationApply the Cisco software update addressing CSCvd77904 and review RBAC role configurations to ensure non-administrative users only have access to appropriate CLI commands.

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\(1\)= 7.3\(2\)n1\(0.395\)= 8.1\(0.112\)s0>= 7.0\(3\)i4, < 7.0\(3\)i7\(1\)>= 6.0, < 7.0\(3\)i7\(2\)>= 5.2, < 8.1\(1\)

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

CVSS:3.0/AV:N/AC:L/PR:L/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. Check NX-OS version
    Execute `show version` on the device CLI and locate the NX-OS release string (for example, 7.0(3)i7(1) or 6.0(2))
    Affected if The version falls within any of these ranges: 6.0 to 7.3(3)n1(1), 7.3(2)n1(1)(0.395), 8.1(0)(112)s0, 7.0(3)i4 to 7.0(3)i7(1), 6.0 to 7.0(3)i7(2), or 5.2 to 8.1(1)
  2. Identify configured users
    Execute `show user-account` or `show running-config | include username` to list all locally configured user accounts
    Affected if Any non-administrative user accounts exist on the device (users with roles other than network-admin)
  3. Review RBAC role assignments
    Execute `show role` to list all configured roles, then `show role detail <role-name>` for each custom role to inspect permitted commands
    Affected if Any role assigned to non-admin users permits commands restricted to administrative users (such as configuration modification, boot variables, or system image management)
  4. Verify current user sessions
    Execute `show users` to display active logged-in sessions and their associated roles
    Affected if Any non-admin user is currently authenticated and running with elevated privileges

The device is affected if the NX-OS version matches the affected version ranges AND non-administrative users have been assigned roles that inadvertently grant access to restricted CLI commands.

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 the Cisco software update addressing CSCvd77904 and review RBAC role configurations to ensure non-administrative users only have access to appropriate CLI commands.

Fix this in Nx Os Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,930
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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-2018-0293 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