https://patchthecve.com/CVEs with upgrade or downgrade fix stepshttps://patchthecve.com/cve/CVE-2021-27954.htmlhttps://patchthecve.com/cve/CVE-2021-27954.htmlWed, 17 Jun 2026 03:45:40 +0000HIGH 8.2: A heap-based buffer overflow vulnerability exists on the ecobee3 lite 4.5.81.200 device in the HKProcessConfig function of the HomeKit Wireless Access Control setup process. A threat actor can exploit this vulnerability to force the device to connect to a SSID or cause a denial of service.https://patchthecve.com/cve/CVE-2021-27953.htmlhttps://patchthecve.com/cve/CVE-2021-27953.htmlWed, 17 Jun 2026 03:45:40 +0000HIGH 7.5: A NULL pointer dereference vulnerability exists on the ecobee3 lite 4.5.81.200 device in the HomeKit Wireless Access Control setup process. A threat actor can exploit this vulnerability to cause a denial of service, forcing the device to reboot via a crafted HTTP request.https://patchthecve.com/cve/CVE-2021-27952.htmlhttps://patchthecve.com/cve/CVE-2021-27952.htmlWed, 17 Jun 2026 03:45:40 +0000CRITICAL 9.8: Hardcoded default root credentials exist on the ecobee3 lite 4.5.81.200 device. This allows a threat actor to gain access to the password-protected bootloader environment through the serial console.