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* CVE-2020-12638 workaround for WPA downgrade attack When connected to an encrypted (WEP/WPA) router, a rogue packet can cause the ESP8266 WiFi stack to drop to an unecrypted rogue network of the same SSID. Handle this by dropping the WiFi connection immediately and reconnecting to the stored WPA/WEP network requested by the application, whenever the AUTHMODE changes to OPEN from a secured mode. https://lbsfilm.at/blog/wpa2-authenticationmode-downgrade-in-espressif-microprocessors for more details.