What’s Vulnerable › Vulnerabilities

CVE-2021-27952

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-03 · updated 2026-06-17
• Weakness: CWE-798

Description

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.

Affected products

• Ecobee3 Lite Firmware: 4.5.81.200

References

• https://www.l9group.com/advisories/hard-coded-default-root-credentials-for-all-ecobee3-lite-devices
• https://www.l9group.com/advisories/hard-coded-default-root-credentials-for-all-ecobee3-lite-devices

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