CVE-2011-3828
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 · uneditedDVRemoteAx.ax 2.1.0.39 in the DVR Remote ActiveX control allows remote attackers to execute arbitrary code via a crafted DVRobot.dll file in a manifest directory on a web server.
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 DVR Remote ActiveX control (DVRemoteAx.ax version 2.1.0.39) is vulnerable to DLL preloading/hijacking. The control loads a DVRot.dll file from a manifest directory on a remote web server without proper validation, allowing remote attackers to supply a malicious DLL that executes with the privileges of the ActiveX control.
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= 2.1.0.39CVSS 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
- M
- Authentication
- None
- Confidentiality
- Complete
- Integrity
- Complete
- Availability
- Complete
AV:N/AC:M/Au:N/C:C/I:C/A:C
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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Locate the DVRemoteAx.ax ActiveX control fileSearch the system for DVRemoteAx.ax. On 32-bit Windows, check C:\Windows\system32\ and C:\Windows\Downloaded Program Files\. On 64-bit Windows, also check C:\Windows\SysWOW64\. Use: dir /s C:\DVRemoteAx.ax or Get-ChildItem -Path C:\ -Filter DVRemoteAx.ax -Recurse -ErrorAction SilentlyContinueAffected if The file exists on the system at any location
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Verify the file versionRight-click the found DVRemoteAx.ax file, select Properties, then view the Details tab. Alternatively, use PowerShell: (Get-Item 'C:\path\to\DVRemoteAx.ax').VersionInfo.FileVersionAffected if The version reported is exactly 2.1.0.39
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Check if the control is registered as an ActiveX controlOpen Registry Editor and search for DVRemoteAx in HKEY_CLASSES_ROOT\CLSID\ or run: reg query HKLM\SOFTWARE\Classes /s /f DVRemoteAxAffected if The control is registered in the Windows registry, indicating it is available for use in Internet Explorer or other applications
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Verify presence of DVRot.dll that the control loadsSearch for DVRot.dll on the system using: dir /s C:\DVRot.dll or Get-ChildItem -Path C:\ -Filter DVRot.dll -Recurse -ErrorAction SilentlyContinueAffected if DVRot.dll exists on the system, as the vulnerable control attempts to load this DLL from a remote server without validation
If DVRemoteAx.ax version 2.1.0.39 is installed and registered as an ActiveX control on the system, the environment is affected by this DLL hijacking vulnerability.
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 dataDisable or remove the vulnerable DVRemoteAx.ax ActiveX control from affected systems. If the control is required for business purposes, implement network-level controls to ensure the ActiveX only connects to trusted servers and consider upgrading to a patched version if available.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2011-3828 — 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-2011-3828 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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- 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
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