The silicon vendor Espressif has already patched the last firmware (SDK) of such devices. However, other products that uses this chips with still have to patch against it.
The beautiful part of IoT is how there's billions of devices out in the wild with no upgrade plan.
The ESP chips are OTA capable with example code provided, but that still means vendors have to incorporate the function, provide a way for the device to check for updates, care enough to produce updates, and secure the upgrade mechanism enough that it's not a worse vulnerability than an unpatched device.
