CVE-2018-6402: Ecobee ECOBEE4 Firmware

High severity, CVSS 7.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Ecobee Ecobee4 4.2.0.171 devices can be forced to deauthenticate and connect to an unencrypted Wi-Fi network with the same SSID, even if the device settings specify use of encryption such as WPA2, as long as the competing network has a stronger signal. An attacker must be able to set up a nearby SSID, similar to an "Evil Twin" attack.

Affected products

• Ecobee ECOBEE4 Firmware: version 4.2.0.171 only

Published 2020-04-14. Last modified 2026-06-17.