CVE-2025-24990. Microsoft’s legacy code nightmare.
A driver for old fax modems (ltmdm64.sys) has been quietly sitting on every Windows system since 2006. Possibly even Windows XP, Windows 7, 10, 11, Server 2022, Server 2025. ALL of them.
The driver was designed for hardware nobody uses anymore. Fax modems.
Unfortunately it is designed to give full rights to the code and hackers can abuse this issue.
Check if you still have it – (Doublecheck)
Want to check if the driver is still on your system?
Press Windows + R
Type: C:\Windows\System32\drivers
Look for: ltmdm64.sys
Still there? Update immediately.
Want to check if the driver is still on your system?
Press Windows + R
Type: C:\Windows\System32\drivers
Look for: ltmdm64.sys
Still there? Update immediately( i.e. delete)
I checked 2 systems and already deleted.
As you can see the October update needs to happen:
It was easy to find this issue – I was reviewing some of the information that I normally check – and found this nugget.