There is a critical firmware update for a security issue with Logitech Unifying receivers.

https://lifehacker.com/update-your-l...now-1836382167

https://www.theverge.com/2019/7/14/2...le-hack-hijack

https://support.logi.com/hc/en-us/co...earch-Findings

For Logitech’s Unifying receiver:
Mac: https://aws13-customer-care-assets.s.../SecureDFU.zip

PC: https://aws13-customer-care-assets.s...cureDFU_48.exe

For Logitech’s G900 gaming mouse:
http://www.logitech.com/pub/techsupp...ate_1.5.23.exe