PT-2021-17693 · Ecobee · Ecobee3 Lite

Published 2021-08-03 · Updated 2025-07-27 · CVE-2021-27954

Positive Technologies (AI Summary)

CVSS v3.1

8.2

High

Base vector

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

Name of the Vulnerable Software and Affected Versions ecobee3 lite version 4.5.81.200

Description A heap-based buffer overflow vulnerability exists in the HKProcessConfig function of the HomeKit Wireless Access Control setup process. An attacker can exploit this vulnerability to force the device to connect to a specific SSID or cause a denial of service.

Recommendations Update to a newer version that addresses this issue. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

RCE

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2021-27954

Affected Products

Ecobee3 Lite

References · 5

• 🔥 https://l9group.com/advisories/ecobee3-lite-heap-overflow · Exploit
• https://osv.dev/vulnerability/CVE-2021-27954 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-27954 · Security Note
• https://t.me/cibsecurity/26747 · Telegram Post
• https://twitter.com/grok/status/1949289510359154705 · Twitter Post