CVE-2009-4109
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 · uneditedThe install wizard in DotNetNuke 4.0 through 5.1.4 does not prevent anonymous users from accessing functionality related to determination of the need for an upgrade, which allows remote attackers to access version information and possibly other sensitive information.
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 confidenceThe install wizard in DotNetNuke versions 4.0 through 5.1.4 fails to enforce authentication requirements for upgrade detection functionality, allowing remote unauthenticated attackers to access version information and potentially other sensitive system details via the install wizard endpoints.
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= 4.0= 4.3.5= 4.4.1= 4.5.2= 4.5.4= 4.5.5= 4.6.0= 4.6.1= 4.6.2= 4.7.0= 4.8.0= 4.8.1CVSS 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
- Authentication
- None
- Confidentiality
- Partial
- Integrity
- None
- Availability
- None
AV:N/AC:L/Au:N/C:P/I:N/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 checksWork through these to decide whether this CVE applies to you.
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Determine installed DotNetNuke versionInspect the Version property in the web.config file or check for a Version.txt file in the root installation directory. You can also check the assembly version of DotNetNuke.dll.Affected if The installed version matches any version from 4.0 through 5.1.4, including: 4.0, 4.3.5, 4.4.1, 4.5.2, 4.5.4, 4.5.5, 4.6.0, 4.6.1, 4.6.2, 4.7.0, 4.8.0, 4.8.1, or any version in between up to 5.1.4.
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Verify if install wizard files exist on the serverCheck for the presence of the install wizard directory and its associated files (such as Install.aspx, Upgrade.aspx, or similar files in an Install or InstallWizard folder) in the web root.Affected if The install wizard files are present on the production server.
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Test unauthenticated access to install wizard endpointsAttempt to access the install wizard upgrade detection endpoints via HTTP request without providing any authentication credentials. Common paths to test include /Install/ or paths containing 'Upgrade' in the URL.Affected if The install wizard endpoints are accessible without any authentication and return version information or system details.
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Check web server authentication configurationReview the web server (IIS) configuration to determine whether the install wizard paths have been configured to require authentication or IP restrictions.Affected if The install wizard paths are not protected by authentication requirements in the web server configuration.
You are affected if your DotNetNuke installation runs any version between 4.0 and 5.1.4 AND the install wizard files remain on the server AND those endpoints are accessible without authentication.
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.
From vendor dataRestrict access to the DotNetNuke install wizard and upgrade-related paths to authenticated administrators only via web server configuration (IIS), and remove or delete the installation files from production environments.
- Consultation1.0 h
- Implementation2.0 h
- Testing1.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,424.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2009-4109 — 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-2009-4109 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