10.0.4 Network Extension App - Excessive CPU Usage

We had identified and fixed the issue that we believed was causing the excessive CPU usage with the Network Extension app but as many of you are still encountering the problem there is obviously something else going on, something that we've so far been unable to reproduce.

We've started this thread to collect and collate the details on the occurrences of this on 10.0.4 and as a place to post your SDUs.

We still believe that network connectivity issues and the high CPU are unrelated as the Network Extension app is not directly involved in network activity, as it behaves as a watcher to the actual network extension which is what performs the actual interception.

Thank you for your continued feedback and your patience.

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  • I am experiencing this issue on a macbook pro recently update to 11.2.3. Sophos version 10.0.4 with virtual box. System is ok until I start a virtual box VM with a host only network interface. As soon as I connect to the VM IP CPU for the network extension app shoots up and the system becomes unusable until the VM is destroyed. Previously this set up was working fine.

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  • I am experiencing this issue on a macbook pro recently update to 11.2.3. Sophos version 10.0.4 with virtual box. System is ok until I start a virtual box VM with a host only network interface. As soon as I connect to the VM IP CPU for the network extension app shoots up and the system becomes unusable until the VM is destroyed. Previously this set up was working fine.

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