CVE-2021-27954

Published: Aug 3, 2021Modified: Jun 17, 2026

8.2

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Exploitability: 3.9 / Impact: 4.2

Source: NVD

Description

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.

Affected (1)

Products: Ecobee: Ecobee3 Lite Firmware

1 product

Ecobee3 Lite Firmware

Configuration A

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Ecobee Ecobee3 Lite Firmware	Version 4.5.81.200

Running on/with	Platform Versions
Ecobee Ecobee3 Lite	All versions

Related CWEs

Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer.

References (2)

https://www.l9group.com/advisories/ecobee3-lite-heap-overflow

Source: cve@mitre.org

ExploitThird Party Advisory

https://www.l9group.com/advisories/ecobee3-lite-heap-overflow

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitThird Party Advisory

Timeline

No history available yet.