CVE-2020-7850
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 · uneditedNBBDownloader.ocx ActiveX Control in Groupware contains a vulnerability that could allow remote files to be downloaded and executed by setting the arguments to the activex method. A remote attacker could induce a user to access a crafted web page, causing damage such as malicious code infection.
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 confidenceNBBDownloader.ocx ActiveX control in Groupware contains an arbitrary file download and execution vulnerability. By persuading a user to visit a crafted webpage, a remote attacker can invoke ActiveX methods with malicious arguments to download and execute arbitrary code on the victim's system.
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<= 1.0.0.12CVSS 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
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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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Locate NBBDownloader.ocx on the systemSearch for Nbbdownloader.ocx in typical ActiveX component directories such as C:\Windows\System32\, C:\Windows\SysWOW64\, or the Groupware installation directory. Use File Explorer search or command: dir /s C:\Nbbdownloader.ocxAffected if The file exists on the system, indicating the ActiveX control is installed
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Check the installed version of Nbbdownloader.ocxRight-click the located Nbbdownloader.ocx file, select Properties, then view the Details tab to see the File Version. Alternatively, use PowerShell: Get-Item 'C:\Path\To\Nbbdownloader.ocx' | Select-Object VersionInfoAffected if The version number displayed is 1.0.0.12 or lower (the <= 1.0.0.12 range indicates vulnerability)
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Verify if the ActiveX control is enabled in Internet ExplorerOpen Internet Explorer, go to Internet Options > Security > Custom Level > ActiveX controls and plugins. Check settings for 'Run ActiveX controls and plugins' and 'Script ActiveX controls marked safe for scripting'. Also check: Tools > Manage Add-ons > Show: All Add-ons for NBBDownloaderAffected if The NBBDownloador (or NBB) ActiveX add-on is present and enabled, meaning it can be invoked by malicious webpages
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Check for Groupware installation paths containing the vulnerable componentLook for Groupware or Douzone software installations in common directories: C:\Program Files\Groupware, C:\Program Files (x86)\Groupware, or check the program installation list in Programs and Features control panelAffected if A Douzone or related Groupware product is installed, suggesting the vulnerable ActiveX component may be present
A user is affected if the NBBDownloader.ocx file exists on their system with version 1.0.0.12 or lower AND the ActiveX control is enabled in Internet Explorer, allowing a malicious webpage to invoke its download/execution methods.
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 the NBBDownloader.ocx ActiveX control via Internet Explorer security settings or Group Policy, or remove/uninstall the affected Groupware component if not required. Apply any vendor patches if available.
- Consultation4.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-7850 — 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-2020-7850 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
- No spam, self-promotion, credentials, or personal data