CVE-2020-7821
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 · uneditedNexacro14/17 ExtCommonApiV13 Library under 2019.9.6 version contain a vulnerability that could allow remote attacker to execute arbitrary code by modifying the value of registry path. This can be leveraged for code execution by rebooting the victim’s PC
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 confidenceThe ExtCommonApiV13 library in Nexacro14/17 versions prior to 2019.9.6 contains a vulnerability allowing remote code execution through modification of registry path values. An attacker who can manipulate these registry entries can achieve arbitrary code execution that activates upon system reboot.
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< 2019.9.6< 2019.9.6CVSS 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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Identify if Nexacro14 or Nexacro17 is installedCheck Windows registry under HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall for entries containing 'Nexacro' or look for the ExtCommonApiV13.dll file in common installation directories such as C:\Program Files\Nexacro or C:\Program Files (x86)\NexacroAffected if A Nexacro14 or Nexacro17 installation is found on the system
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Determine the installed Nexacro versionRead the version value from the registry key identified in step 1 (typically DisplayVersion) or from the version info of the ExtCommonApiV13.dll file if locatedAffected if The version is lower than 2019.9.6 (for example, 2019.8.1, 2019.1.0, or any version number less than 2019.9.6)
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Locate the ExtCommonApiV13 librarySearch for ExtCommonApiV13.dll on the system or check the Nexacro installation bin directory for this specific DLL fileAffected if The ExtCommonApiV13.dll file is present and belongs to a Nexacro installation version below 2019.9.6
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Inspect registry paths used by NexacroExamine registry keys under HKLM\SOFTWARE\Nexacro or HKCU\SOFTWARE\Nexacro for any user-controlled path values (such as paths to executables, DLLs, or configuration files) that could be modified by an attackerAffected if Registry values under Nexacro keys point to locations writable by unprivileged users, allowing manipulation for arbitrary code execution on reboot
A system is affected if Nexacro14 or Nexacro17 version lower than 2019.9.6 is installed, particularly if the ExtCommonApiV13 library is present and Nexacro-related registry paths are writable by non-admin users.
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 · scoped2019.9.6
Update Nexacro14/17 to version 2019.9.6 or later to obtain the patched ExtCommonApiV13 library. If the software is unused, consider removing it entirely to eliminate the attack surface.
2019.9.6 or later (for both Nexacro 14 and Nexacro 17)
- Identify which version of Nexacro is in use (Nexacro 14 or Nexacro 17)
- Obtain the fixed version (2019.9.6 or later) from the official vendor (support.tobesoft.co.kr)
- Backup any existing Nexacro installations and configurations
- Install the updated Nexacro version 2019.9.6 or later
- Verify the installation was successful
- Test that applications function correctly with the updated library
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-2020-7821 — 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-2020-7821 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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- Version or environment caveats, and links to real fixes
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