What is CNMNSST.exe?

The genuine CNMNSST.exe file is a software component of Canon IJ Network Scanner Selector EX by Canon.
The Canon IJ Network Scanner Selector EX is a tool that allows users to select the printer to be used for scanning or printing over a network. CNMNSST.exe runs the Canon IJ Network Scanner Selector EX. This is not a critical Windows component and can be removed if known to cause problems. The Canon IJ Network Scanner Selector EX is usually installed with Canon printers and scanners. It is accessible through an icon located in the notification tray which the program creates upon installation. This program supports the Windows platform. Canon Inc. is a Japanese corporation that designs and manufactures imaging and optical products such as camcorders, cameras, steppers, photocopiers, computer printers, as well as medical equipment. Canon was founded in 1937 as Precision Optical Instruments Laboratory by Takeshi Mitarai, Goro Yoshida, Saburo Uchida and Takeo Maeda. The company is currently worth over ¥4 trillion and employs over 190,000 people and has offices on all continents except Antarctica. Canon is headquartered in Tokyo, Japan.

CnMNSSt stands for Canon IJ M Network Scanner Selector Utility

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.

Click to Run a Free Scan for CNMNSST.exe related errors

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 (29% of all occurrences), 453,736 bytes and 6 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 program has no visible window. The program starts when Windows starts (see Registry key: MACHINE\Run). It can change the behavior of other programs or manipulate other programs. Therefore the technical security rating is 41% 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 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.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: ASecurity 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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

CNMNSST.exe [all]