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Nagios XiApplication · Nagios

CVE-2020-36862

MEDIUM · 6.1 CVSS v3.1 Published 2025-10-30
Fix available
A fix is available. Upgrade to 5.6.11 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
Nagios XI versions prior to 5.6.11 contain unauthenticated vulnerabilities in the Highcharts local exporting tool. Crafted export requests could (1) inject script into exported/returned content due to insufficient output encoding (XSS), and (2) cause the server to fetch attacker-specified URLs (SSRF), potentially accessing internal network resources. An unauthenticated remote attacker can leverage these issues to execute script in a user's browser when the exported content is viewed and to disclose sensitive information reachable from the export server via SSRF.

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

Nagios XI versions prior to 5.6.11 contain unauthenticated vulnerabilities in the Highcharts local exporting tool. The first vulnerability is a reflected XSS due to insufficient output encoding, allowing script injection into exported content viewed by users. The second is an SSRF vulnerability enabling the server to fetch attacker-specified URLs, potentially accessing internal network resources.

MitigationUpgrade Nagios XI to version 5.6.11 or later to patch both vulnerabilities. If upgrading is not immediately feasible, disable the Highcharts local exporting feature and review network segmentation to limit internal resource exposure from the server.

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
Nagios XiApplication
Affected:< 5.6.11

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:3.1/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. Identify Nagios XI installation and version
    Locate the Nagios XI installation directory and find the version file or check the Nagios XI admin interface for version information. Typical locations include /usr/local/nagiosxi or checking the About page in the web interface.
    Affected if The installed version is below 5.6.11
  2. Compare version to affected range
    Take the discovered version number and compare it against the vulnerable range: any version prior to 5.6.11 is affected.
    Affected if Version is less than 5.6.11
  3. Determine if Highcharts local exporting is enabled
    Check the Nagios XI configuration files and settings for the Highcharts export feature. This is typically found in the Nagios XI web interface under the reporting or charting settings, or in configuration files related to the Highcharts module.
    Affected if The Highcharts local exporting feature is enabled and the version is below 5.6.11
  4. Inspect network logs for unusual outbound requests
    Review server access logs and network traffic for unexpected GET or POST requests from the Nagios XI server to external or internal URLs, which could indicate SSRF exploitation attempts.
    Affected if Unexpected outbound requests from the server are present and the version is below 5.6.11 with Highcharts exporting enabled

You are affected if your Nagios XI version is prior to 5.6.11 and the Highcharts local exporting feature is enabled.

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.

dbcve · scoped
Upgrade available Upgrade to 5.6.11 or later
Fixed in 5.6.11
Interim mitigation

Upgrade Nagios XI to version 5.6.11 or later to patch both vulnerabilities. If upgrading is not immediately feasible, disable the Highcharts local exporting feature and review network segmentation to limit internal resource exposure from the server.

Recommended fix High confidence

Nagios XI version 5.6.11 or later

  1. 1. Back up the current Nagios XI installation and database before proceeding with any upgrade.
  2. 2. Obtain the Nagios XI 5.6.11 or later version from the official Nagios website (www.nagios.com).
  3. 3. Follow the official Nagios XI upgrade documentation to apply the update, ensuring all prerequisites are met.
  4. 4. After upgrade, verify the Highcharts exporting functionality works correctly and the vulnerability is remediated.
  5. 5. Consider running a security scan or penetration test to confirm the XSS and SSRF vulnerabilities are no longer present.
Caveat Standard Nagios XI upgrade risks apply - review release notes for any configuration or compatibility considerations

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Nagios Xi Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,490
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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-2020-36862 in production — separate from our analysis above.

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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