CVE-2021-27952 json
Hardcoded default root credentials exist on the ecobee3 lite 4.5.81.200 device.
published 2021-08-03 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-14670
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 66%
- public exploits
- 0
- none known
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.
Exploit prediction
1.13% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- l9group.com https://www.l9group.com/advisories/hard-coded-default-root-credentials-for-all-ecobee3-lite-devices referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Classification
- Weakness
-
- CWE-798 Use of Hard-coded Credentials
References
-
l9group.com
/advisories/hard-coded-default-root-credentials-for-all-ecobee3-lite-devices
exploit, third-party-advisory
Sources
- CVE List CVE-2021-27952
- NVD CVE-2021-27952
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.