PT-2021-17691 · Ecobee · Ecobee3 Lite

Published 2021-08-03 · Updated 2021-08-12 · CVE-2021-27952

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

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

Description: The issue concerns hardcoded default root credentials on the device. This allows a threat actor to gain access to the password-protected bootloader environment through the serial console.

Recommendations: For version 4.5.81.200, consider changing the default root credentials to prevent unauthorized access. As a temporary workaround, restrict physical access to the serial console to minimize the risk of exploitation.

Exploit

Fix

Using Hardcoded Credentials

Weakness Enumeration

CWE-798

Related Identifiers

CVE-2021-27952

Affected Products

Ecobee3 Lite

References · 4

• 🔥 https://l9group.com/advisories/hard-coded-default-root-credentials-for-all-ecobee3-lite-devices · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-27952 · Security Note
• https://osv.dev/vulnerability/CVE-2021-27952 · Vendor Advisory
• https://t.me/cibsecurity/26743 · Telegram Post