What is CNMNSST.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the CNMNSST.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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CNMNSST.exe file information

Windows Task Manager with CNMNSST
CNMNSST.exe process in Windows Task Manager

The process known as Canon IJ Network Scanner Selector EX belongs to software Canon IJ Network Scanner Selector EX for Microsoft Windows by CANON INC (

Description: CNMNSST.exe is not essential for the Windows OS and causes relatively few problems. CNMNSST.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 452,016 bytes (27% of all occurrences), 453,736 bytes and 5 more variants. 
The file is a Verisign signed file. The file is certified by a trustworthy company. The CNMNSST.exe file is not a Windows core file. The process is loaded during the Windows boot process (see Registry key: MACHINE\Run). The program is not visible. It can change the behavior of other programs or manipulate other programs. Therefore the technical security rating is 44% dangerous, however you should also read the user reviews.

Uninstalling this variant: You have the option to completely remove Canon IJ Network Scanner Selector EX (Control Panel ⇒ Uninstall a Program).

Recommended: Identify CNMNSST.exe related errors

Important: Some malware camouflages itself as CNMNSST.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the CNMNSST.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Leave it alone. Canon Inc. software agent that allows your computer to receive scan from a network Canon scanner.

Summary: Average user rating of CNMNSST.exe: based on 1 vote with 1 user comment. One user thinks it's probably harmless.

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Best practices for resolving CNMNSST issues

A clean and tidy computer is the key requirement for avoiding problems with CNMNSST. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the CNMNSST.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

CNMNSST.exe [all]