dbcve.org
Nx OsOperating system · Cisco

CVE-2018-0337

HIGH · 7.8 CVSS v3.1 Published 2018-06-21
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
80/100
Remediation priority · High
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 role-based access-checking mechanisms of Cisco NX-OS Software could allow an authenticated, local attacker to execute arbitrary commands on an affected device. The vulnerability exists because the affected software lacks proper input and validation checks for certain file systems. An attacker could exploit this vulnerability by issuing crafted commands in the CLI of an affected device. A successful exploit could allow the attacker to cause other users to execute unwanted, arbitrary commands on the affected device. Cisco Bug IDs: CSCvd06339, CSCvd15698, CSCvd36108, CSCvf52921, CSCvf52930, CSCvf52953, CSCvf52976.

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-checking mechanisms of Cisco NX-OS Software allows an authenticated, local attacker to execute arbitrary commands by issuing crafted CLI commands that exploit insufficient input and validation checks for certain file systems, causing other users to unknowingly execute unwanted commands.

MitigationApply the relevant Cisco software updates/patches for NX-OS to address the vulnerability; until patched, limit local CLI access to trusted users only and monitor for suspicious command patterns.

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\(8\)n1\(1\)= 7.1\(4\)n1\(1\)= 7.3\(1\)n1\(0.6\)= 7.3\(2\)n1\(0.350\)= 7.3\(1\)dx\(0.119\)= 7.3\(3\)d1\(0.2\)= 8.0\(0.54\)s0= 8.1\(0\)bd\(0.20\)= 8.1\(0.9\)= 8.2\(0.4\)s0= 8.3\(0\)spg\(0.30\)= 8.8\(3.5\)s0

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
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/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. Identify installed NX-OS version
    Execute 'show version' command on the Cisco NX-OS device and locate the 'NXOS' version line in the output
    Affected if The version displayed matches any of these exact versions: 7.0(8)n1(1), 7.1(4)n1(1), 7.3(1)n1(0.6), 7.3(2)n1(0.350), 7.3(1)dx(0.119), 7.3(3)d1(0.2), 8.0(0.54)s0, 8.1(0)bd(0.20), 8.1(0.9), 8.2(0.4)s0, 8.3(0)spg(0.30), or 8.8(3.5)s0
  2. Verify the system is running NX-OS
    Confirm the device is a Cisco NX-OS system by checking 'show version' output for 'NXOS' or 'Nexus' in the software identification
    Affected if The device runs Cisco NX-OS and the version matches the affected list in step 1
  3. Confirm local CLI authentication is enabled
    Execute 'show running-config | include username' or 'show aaa authentication' to verify local user accounts exist on the device
    Affected if Local user accounts are configured, as the vulnerability requires an authenticated local attacker to issue crafted CLI commands
  4. Review command history for suspicious patterns
    Check 'show history' output or review logs for unexpected or malformed file system commands that may indicate exploitation attempts
    Affected if Unusual CLI commands related to file system operations appear in history or logs, especially commands that could trigger unintended command execution for other users

The environment is affected if the device runs Cisco NX-OS version 7.0(8)n1(1), 7.1(4)n1(1), 7.3(1)n1(0.6), 7.3(2)n1(0.350), 7.3(1)dx(0.119), 7.3(3)d1(0.2), 8.0(0.54)s0, 8.1(0)bd(0.20), 8.1(0.9), 8.2(0.4)s0, 8.3(0)spg(0.30), or 8.8(3.5)s0 and has local CLI user accounts 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

Apply the relevant Cisco software updates/patches for NX-OS to address the vulnerability; until patched, limit local CLI access to trusted users only and monitor for suspicious command patterns.

Fix this in 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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Scan for this in your stack

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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-2018-0337 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