Fix Access Database Engine 2016 zlib Vulnerabilities in ACEWSS.DLL
Question details
A security scanner flagged potential zlib vulnerabilities in Microsoft Access Database Engine 2016 Redistributable files (ACEWSS.DLL and Mso20win32client.dll).
- Product
- Microsoft Access Database Engine 2016
- Device & OS
- not provided
- Scenario
- Running a system security scan to identify software vulnerabilities in installed Office and database components.
- Observed behavior
- The vulnerability scanner identifies ACEWSS.DLL and Mso20win32client.dll as containing outdated or vulnerable zlib components.
Before modifying or removing any database engine files, verify that no critical business applications rely on the Microsoft Access Database Engine 2016 Redistributable to function properly.
Update via Microsoft Security Channels
Check official Microsoft advisories and apply the latest security patches to secure the Access Database Engine.
A valid Microsoft digital signature on ACEWSS.DLL confirms its authenticity but does not mean it is free from vulnerabilities. To eliminate the zlib flaw, you must install the official patched version from Microsoft.
Navigate to the Microsoft Security Response Center (MSRC) or the official Microsoft Update Catalog in your web browser.
Search for updates related to Microsoft Access Database Engine 2016 Redistributable or the specific CVE reported by your vulnerability scanner.
Download the latest security patch and run the installer to overwrite the vulnerable ACEWSS.DLL and Mso20win32client.dll files with secured versions.
Right-click the updated DLL files, select Properties, and navigate to the Digital Signatures tab to ensure the new files are authentically signed by Microsoft.
Remove the Redistributable if Not Required
Uninstalling the Access Database Engine completely eliminates the vulnerability if no applications currently depend on it.
Switch to a Secure and Lightweight Office Suite
If you are dealing with persistent security warnings and complex redistributable updates in Microsoft Office, consider switching to WPS Office. It provides a highly secure, lightweight alternative with excellent compatibility for standard document formats without relying on legacy database engines.
- 1. Download WPS Office: Visit the official WPS website and download the free installer for your operating system.
- 2. Install the Suite: Run the setup file and follow the streamlined installation process.
- 3. Open Your Files Securely: Launch WPS Office and directly open your existing Microsoft Office files with perfect formatting retention.
Frequently Asked Questions
Does a valid Microsoft digital signature mean the file is secure?
No. A valid signature only confirms that the file was genuinely created by Microsoft and has not been maliciously altered since it was signed. It does not guarantee that the file's code is free from underlying vulnerabilities like the zlib issue.
Why is a zlib vulnerability affecting Microsoft Access?
Zlib is a widely used data compression library. Microsoft Access Database Engine utilizes this library internally for data compression and decompression, exposing the engine to security risks if the bundled zlib version becomes outdated.
Can I manually replace ACEWSS.DLL with a newer version?
Manually swapping DLL files is highly discouraged as it can lead to application crashes, registry errors, and system instability. You should always use official update packages or patches provided by Microsoft to update these components.
What happens if I ignore this security scanner warning?
Ignoring the warning leaves your system potentially vulnerable to exploits targeting the specific zlib flaw. If a malicious actor gains access to your environment, they could leverage this vulnerability to compromise your data or system security.
