Hardcoded default root credentials exist on the ecobee3 lite 4.5.81.200 device.
Priority MEDIUM 44CWE-798Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-798.
Summary
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.
Why it matters now
EPSS 0.01129 66th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-27952
- 2026-10-03 Alias added: GHSA-3xpf-gg8x-9h3c
References
More Ecobee3 Lite Firmware vulnerabilities
- TI-2021-09281 A heap-based buffer overflow vulnerability exists on the ecobee3 lite 4.5.81.200 device… CVSS 3.1HIGH 8.2
- TI-2021-09280 A NULL pointer dereference vulnerability exists on the ecobee3 lite 4.5.81.200 device in… CVSS 3.1HIGH 7.5
Sources
- CVE-2021-27952 · CVE Program
- CVE-2021-27952 · NVD
- FIRST EPSS
- GHSA-3xpf-gg8x-9h3c · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences