{"id":"CVE-2021-27952","aliases":["EUVD-2021-14670","GHSA-3xpf-gg8x-9h3c"],"status":"published","title":"Hardcoded default root credentials exist on the ecobee3 lite 4.5.81.200 device. This allows a...","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.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01129,"percentile":0.66804,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-798"],"published":"2021-08-03T14:31:18Z","modified":"2026-06-17T03:45:40Z","products":[{"vendor":"ecobee","product":"ecobee3_lite_firmware"}],"references":[{"url":"https://www.l9group.com/advisories/hard-coded-default-root-credentials-for-all-ecobee3-lite-devices","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27952"},{"url":"https://github.com/advisories/GHSA-3xpf-gg8x-9h3c"}],"sources":{"cve":[{"id":"CVE-2021-27952","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.","status":"published","published":"2021-08-03T14:31:18Z","modified":"2024-08-03T21:33:17.267Z","updated_at":"2026-11-02T14:33:04.360272Z"}],"euvd":[{"id":"EUVD-2021-14670","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.","status":"published","published":"2021-08-03T14:31:18Z","modified":"2024-08-03T21:33:17Z","updated_at":"2026-11-03T03:24:47.80549Z"}],"ghsa":[{"id":"GHSA-3xpf-gg8x-9h3c","title":"Hardcoded default root credentials exist on the ecobee3 lite 4.5.81.200 device. This allows a...","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.","status":"published","published":"2022-05-24T19:09:52Z","modified":"2023-01-30T05:01:12Z","cwes":["CWE-798"],"updated_at":"2026-11-02T14:46:21.550142Z"}],"nvd":[{"id":"CVE-2021-27952","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.","status":"published","published":"2021-08-03T15:15:08.25Z","modified":"2026-06-17T03:45:40.053Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-798"],"updated_at":"2026-11-02T14:06:56.562207Z"}]}}