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Ios XeOperating system · Cisco

CVE-2018-0190

MEDIUM · 6.1 CVSS v3.0 Published 2018-03-28
Fix available
A fix is available. Upgrade to 16.3.6 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

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
Multiple vulnerabilities in the web-based user interface (web UI) of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the web UI of the affected software. The vulnerabilities are due to insufficient input validation of certain parameters that are passed to the affected software via the web UI. An attacker could exploit these vulnerabilities by persuading a user of the affected UI to access a malicious link or by intercepting a user request for the affected UI and injecting malicious code into the request. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected UI or allow the attacker to access sensitive browser-based information on the user's system. Cisco Bug IDs: CSCuz38591, CSCvb09530, CSCvb10022.

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 · moderate confidence

Multiple cross-site scripting (XSS) vulnerabilities in the Cisco IOS XE Software web-based management interface allow unauthenticated remote attackers to inject malicious script code via insufficiently validated parameters. Successful exploitation enables arbitrary script execution in the context of the web UI or access to sensitive browser-based information.

MitigationApply the vendor patch from Cisco for IOS XE software to address the input validation flaws; consider disabling the web UI if not required or implementing additional web application firewall protections.

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
Ios XeOperating system
Affected:< 16.3.6

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
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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. Confirm the device is running Cisco IOS XE
    Execute 'show version' or 'show system' on the device CLI and look for 'IOS XE' in the output
    Affected if The device does not run Cisco IOS XE (this CVE only affects IOS XE)
  2. Identify the IOS XE version
    Run 'show version' and locate the version number (for example, 16.3.5, 16.4.1) in the output
    Affected if The installed version is less than 16.3.6 (any version from 16.0.0 through 16.3.5)
  3. Verify the web-based management interface is enabled
    Check the configuration with 'show running-config | include ip http' or 'show running-config | include ip https' to see if HTTP or HTTPS server is configured
    Affected if HTTP (ip http server) or HTTPS (ip http secure-server) is enabled in the configuration
  4. Confirm remote access to the web UI
    Review interface configurations and access control lists with 'show ip interface' and ACL definitions to determine if the web management interface is reachable from network segments
    Affected if The web UI is reachable from untrusted networks (not limited to localhost or management-only VLANs)

A device is affected if it runs Cisco IOS XE version below 16.3.6 AND has the web-based management interface enabled and accessible.

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 16.3.6 or later
Fixed in 16.3.6
Interim mitigation

Apply the vendor patch from Cisco for IOS XE software to address the input validation flaws; consider disabling the web UI if not required or implementing additional web application firewall protections.

Fix this in Ios Xe Scoped from the published advisory
  • Consultation12.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
30.0 hours of engineering $5,460
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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-2018-0190 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