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Nx OsOperating system · Cisco

CVE-2018-0298

HIGH · 7.5 CVSS v3.0 Published 2018-06-21
Fix available
A fix is available. Upgrade to 1.1.4.169 / 1.1.4.179 or later.
See remediation →
84/100
Remediation priority · High
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
A vulnerability in the web UI of Cisco FXOS and Cisco UCS Fabric Interconnect Software could allow an unauthenticated, remote attacker to cause a buffer overflow on an affected system. The vulnerability is due to incorrect input validation in the web UI. An attacker could exploit this vulnerability by sending a malicious HTTP or HTTPS packet directed to the physical management interface of an affected system. A successful exploit could allow the attacker to cause the process to crash and possibly reload the device, resulting in a denial of service (DoS) condition on the affected system. This vulnerability affects Firepower 4100 Series Next-Generation Firewall, Firepower 9300 Security Appliance, UCS 6200 Series Fabric Interconnects, UCS 6300 Series Fabric Interconnects. Cisco Bug IDs: CSCvb61398, CSCvb86799.

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 buffer overflow vulnerability exists in the web UI of Cisco FXOS and UCS Fabric Interconnect Software due to improper input validation. An unauthenticated remote attacker can send a malicious HTTP/HTTPS packet to the physical management interface, causing a buffer overflow that crashes the process and potentially reloads the device, resulting in denial of service.

MitigationApply vendor-supplied patches for Cisco FXOS and UCS Fabric Interconnect software. Until patches are applied, restrict access to the physical management interface via network segmentation or ACLs to prevent unauthorized exploitation.

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:>= 3.0\(2\), < 3.1\(3a\)a
Firepower Extensible Operating SystemOperating system
Affected:>= 1.1, < 1.1.4.169>= 2.0, < 2.0.1.135>= 1.1, < 1.1.4.179>= 2.0, < 2.0.1.153

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
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 Cisco software platform and version
    Run 'show version' on the device CLI to display the installed software version and platform type (FXOS, NX-OS on UCS Fabric Interconnect)
    Affected if The displayed version falls within the affected ranges: NX-OS >= 3.0(2) and < 3.1(3a)a; FXOS >= 1.1 and < 1.1.4.169, >= 2.0 and < 2.0.1.135, >= 1.1 and < 1.1.4.179, or >= 2.0 and < 2.0.1.153
  2. Verify if HTTP service is enabled on the management interface
    Run 'show http server' or 'show running-config | include http' to check if the HTTP server is enabled
    Affected if HTTP server is enabled and the management interface is reachable
  3. Verify if HTTPS service is enabled on the management interface
    Run 'show https server' or check the web UI SSL configuration to confirm HTTPS is enabled
    Affected if HTTPS server is enabled and the management interface is reachable
  4. Confirm the physical management interface is configured and active
    Run 'show interface mgmt0' or equivalent to verify the management interface status and IP configuration
    Affected if The management interface is up with an assigned IP address and is network-accessible

The environment is affected if the device runs a vulnerable version of Cisco NX-OS or FXOS AND the web UI (HTTP/HTTPS) is enabled on an accessible physical management interface, allowing unauthenticated attackers to send malicious packets.

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 1.1.4.169 / 1.1.4.179 / 2.0.1.135 or later
Fixed in 1.1.4.1691.1.4.1792.0.1.135
Interim mitigation

Apply vendor-supplied patches for Cisco FXOS and UCS Fabric Interconnect software. Until patches are applied, restrict access to the physical management interface via network segmentation or ACLs to prevent unauthorized exploitation.

Fix this in Nx Os Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
20.0 hours of engineering $3,500
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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-2018-0298 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