Applies to: Sophos Home Premium and Free (Mac)

What's happening

On a MacOS computer, an alert is received stating This Device is Vulnerable, however, all the protections are enabled, and all other scenarios as per this article have been covered. This issue happens when the Mac computer has too many applications using virtual slots, thus, there is no slot to add Sophos Home kexts. 

This is a macOS limitation regarding virtual devices slots. The most common applications that use these slots this are virtual machine applications,  as they use up a number of virtual device slots. In addition, Sophos Home also needs virtual devices slots. So, when the system does not have enough virtual device slots, whichever application loads last will result in this error.

Workaround

To fix this issue, remove one of the applications that is using virtual slots,  and restart the Mac computer.

Related information

• Nothing happens when clicking the Allow button on macOS in Security & Privacy
• Sophos Home for MacOS shows that this device is vulnerable
• System Extension Blocked appears on new installations on macOS High Sierra 10.13
• Notifications to allow Sophos Home kernel extensions (KEXT) did not appear