CVE-2021-27953

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.

Weakness

The product dereferences a pointer that it expects to be valid but is NULL.

Affected Software

Potential Mitigations

References

• https://www.l9group.com/advisories/remote-denial-of-service-of-ecobee3-lite
• https://www.l9group.com/advisories/remote-denial-of-service-of-ecobee3-lite