What is BCMSMMSG.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 BCMSMMSG.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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BCMSMMSG.exe file information

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

The process known as Modem Messaging Applet belongs to software BCM Modem Messaging Applet by Broadcom (

Description: BCMSMMSG.exe is not essential for the Windows OS and causes relatively few problems. BCMSMMSG.exe is located in the C:\Windows folder. Known file sizes on Windows 10/8/7/XP are 122,880 bytes (94% of all occurrences), 126,976 bytes, 90,112 bytes or 65,536 bytes. 
The BCMSMMSG.exe file is not a Windows core file. The software starts when Windows starts (see Registry key: MACHINE\Run). The program has no visible window. It is a Microsoft signed file. Therefore the technical security rating is 26% dangerous, however you should also read the user reviews.

Recommended: Identify BCMSMMSG.exe related errors

External information from Paul Collins:

Important: Some malware disguises itself as BCMSMMSG.exe, particularly when not located in the C:\Windows folder. Therefore, you should check the BCMSMMSG.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

Used for dial up modem...harmless
  Charter Guy  
I know very little but from some research I did a few moments ago, it is "driver software for BCM Voice Modems." A different site told me it is of no risk to your system. And it's Microsoft signed so its probably fine..
Used for broadcom 100mbit network cards
The file is needed to use a Broadcom BCM modem
One of many names the .Zerf virus goes by.
  Bob K  
It is an important file for your network adapter.
  FH Harris  
Broadcom modems
  Mr. Hardware  
Used for broadcom 100mbit network cards

Rating chart

Summary: Average user rating of BCMSMMSG.exe: based on 11 votes with 9 user comments. 10 users think BCMSMMSG.exe is essential for Windows or an installed application. One user thinks BCMSMMSG.exe is dangerous and recommends removing it. One user is not sure about it.

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Best practices for resolving BCMSMMSG issues

A clean and tidy computer is the key requirement for avoiding problems with BCMSMMSG. 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 BCMSMMSG.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

BCMSMMSG.exe [all]