CVE-2021-3193
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 · uneditedImproper access and command validation in the Nagios Docker Config Wizard before 1.1.2, as used in Nagios XI through 5.7, allows an unauthenticated attacker to execute remote code as the apache user.
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 confidenceUnauthenticated remote code execution vulnerability in Nagios XI Docker Config Wizard versions before 1.1.2 (affecting Nagios XI through 5.7) due to improper access control and command validation, allowing attackers to execute code as the apache user without authentication.
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<= 5.7.0CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/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 checksWork through these to decide whether this CVE applies to you.
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Confirm Nagios XI installation and versionRun command: cat /usr/local/nagiosxi/etc/version.ini or check the web interface footer for the XI version numberAffected if Nagios XI version is 5.7.0 or lower
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Locate Docker Config Wizard componentCheck for the Docker Config Wizard directory at /usr/local/nagiosxi/html/includes/components/dockerwizard/ or list installed wizards in the Nagios XI components directoryAffected if The dockerwizard component directory exists on the system
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Determine Docker Config Wizard versionCheck the component's version file: cat /usr/local/nagiosxi/html/includes/components/dockerwizard/version.php or inspect the main PHP file for a version constantAffected if Docker Config Wizard version is below 1.1.2 or the version cannot be determined (implies unpatched)
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Verify vulnerable endpoint accessibilityCheck if the wizard configuration script is accessible without authentication by examining the PHP files in the dockerwizard directory, particularly config.php or similar entry pointsAffected if The Docker Config Wizard scripts are accessible without authentication (default vulnerable state)
A user is affected if Nagios XI is at version 5.7.0 or lower AND the Docker Config Wizard component is installed with a version prior to 1.1.2, as this combination allows unauthenticated remote code execution as the apache user.
Generated from the published advisory. Verify against your own configuration.
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 · scopedUpgrade Nagios Docker Config Wizard to version 1.1.2 or later, or upgrade to a patched Nagios XI version that includes the corrected wizard component.
Nagios XI 5.7.1 or later (includes Docker Config Wizard 1.1.2+)
- Upgrade Nagios XI to version 5.7.1 or later, which includes the fixed Nagios Docker Config Wizard (1.1.2 or later)
- Alternatively, if available as a separate component, upgrade the Nagios Docker Config Wizard to version 1.1.2 or later
- After upgrade, verify the vulnerability is resolved by checking the Docker Config Wizard version in the Nagios XI interface
- Review system logs for any signs of exploitation attempts and ensure no unauthorized access occurred
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-3193 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-3193 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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