Edge Devices Under Siege — 393 Days of Unnoticed Access

Episode notes

In this episode of Small Business Cybersecurity Guy, host Maurven McLeod and guest Dr Corinne Jefferson (former US government intelligence analyst turned London-based consultant) unpack Google Threat Intelligence’s alarming report on the Defence Industrial Base (DIB) and explain exactly why it matters to small and medium-sized businesses. They move straight from the uncomfortable headline — Chinese state-linked hackers averaging 393 days of dwell time inside victim networks — to practical implications for 50–80 person companies across manufacturing, logistics, and software supply chains. Topics covered include clear definitions (APT, UNC), the distinction between edge devices and endpoints, why firewalls and VPN appliances are attractive, under-monitored targets, and why EDR often misses the real entry points. They discuss documented campaigns (UNC-3886, UNC-5221/Brickstorm) and how multiple zero-day exploits against edge vendors have been used to gain long-term access and persistence.