The article makes mention of using their network to deliver an exploit. It could have been software, firmware, or hardware related. I'm guessing one of the exi

The article makes mention of using their network to deliver an exploit. It could have been software, firmware, or hardware related. I'm guessing one of the existing zero-days that they hadn't patched yet. Once the end device is compromised the encryption used doesn't really matter as keys and plain text can be intercepted by the kernel. How they got access to the network for delivery is likely via the company itself. A knowingly or unknowingly compromised employee as mentioned seems the most likely.