Your MCU Likely Escaped the eMudhra Intermediate CA Compromise

A compromise of eMudhra's Intermediate Certificate Authority, disclosed on October 20, 2026, has raised concerns about IoT device security, but microcontroller (MCU) devices are likely unaffected because they don't rely on the web PKI certificate bundles that were compromised. Devices running full operating systems like Linux (such as Raspberry Pi) are more vulnerable and should be updated immediately, while MCUs that don't participate in standard HTTPS certificate verification avoided direct impact from the compromise.