Are Your Files Truly Safe? How to Easily Fix the Alarming QNAP NetBak Agent Vulnerability.
QNAP has an important warning for its users. A serious security problem affects the NetBak PC Agent software, which is used on Windows computers to back up files to a QNAP device.
The issue is not with QNAP’s software itself. Instead, it comes from a helper tool made by Microsoft called ASP.NET Core, which NetBak PC Agent needs to run. This tool has a severe weakness, identified as CVE-2025-55315. This flaw is like a faulty lock on a door. It allows an unauthorized person to trick the software and bypass security measures over a network. Experts consider this one of the most serious problems ever found in ASP.NET.
Because the NetBak PC Agent uses this tool, your Windows computer could be at risk if it has not been updated recently. QNAP strongly advises all users to protect their data by taking immediate action.
How to Protect Your System
You need to make sure your Windows computer has the latest security fix from Microsoft. Microsoft fixed the problem on October 14, 2025.
- On your Windows computer, run the Windows Update service.
- Download and install all available updates. This process will automatically patch the vulnerable ASP.NET Core component.
- By updating your system, you close the security hole and ensure your backup process remains safe.
Keeping your computer’s software updated is the simplest and most effective way to protect your files from this kind of threat.