{"id":"CVE-2021-27954","aliases":["EUVD-2021-14672","GHSA-gm95-7c28-qmq3"],"status":"published","title":"A heap-based buffer overflow vulnerability exists on the ecobee3 lite 4.5.81.200 device in the...","description":"A heap-based buffer overflow vulnerability exists on the ecobee3 lite 4.5.81.200 device in the HKProcessConfig function of the HomeKit Wireless Access Control setup process. A threat actor can exploit this vulnerability to force the device to connect to a SSID or cause a denial of service.","severity":{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00936,"percentile":0.61264,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2021-08-03T14:26:39Z","modified":"2026-06-17T03:45:40Z","products":[{"vendor":"ecobee","product":"ecobee3_lite_firmware"}],"references":[{"url":"https://www.l9group.com/advisories/ecobee3-lite-heap-overflow","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27954"},{"url":"https://github.com/advisories/GHSA-gm95-7c28-qmq3"}],"sources":{"cve":[{"id":"CVE-2021-27954","description":"A heap-based buffer overflow vulnerability exists on the ecobee3 lite 4.5.81.200 device in the HKProcessConfig function of the HomeKit Wireless Access Control setup process. A threat actor can exploit this vulnerability to force the device to connect to a SSID or cause a denial of service.","status":"published","published":"2021-08-03T14:26:39Z","modified":"2024-08-03T21:33:17.048Z","updated_at":"2026-11-02T14:33:04.360272Z"}],"euvd":[{"id":"EUVD-2021-14672","description":"A heap-based buffer overflow vulnerability exists on the ecobee3 lite 4.5.81.200 device in the HKProcessConfig function of the HomeKit Wireless Access Control setup process. A threat actor can exploit this vulnerability to force the device to connect to a SSID or cause a denial of service.","status":"published","published":"2021-08-03T14:26:39Z","modified":"2024-08-03T21:33:17Z","updated_at":"2026-11-03T03:24:47.80549Z"}],"ghsa":[{"id":"GHSA-gm95-7c28-qmq3","title":"A heap-based buffer overflow vulnerability exists on the ecobee3 lite 4.5.81.200 device in the...","description":"A heap-based buffer overflow vulnerability exists on the ecobee3 lite 4.5.81.200 device in the HKProcessConfig function of the HomeKit Wireless Access Control setup process. A threat actor can exploit this vulnerability to force the device to connect to a SSID or cause a denial of service.","status":"published","published":"2022-05-24T19:09:52Z","modified":"2023-01-30T05:01:15Z","cwes":["CWE-787"],"updated_at":"2026-11-02T14:46:22.009402Z"}],"nvd":[{"id":"CVE-2021-27954","description":"A heap-based buffer overflow vulnerability exists on the ecobee3 lite 4.5.81.200 device in the HKProcessConfig function of the HomeKit Wireless Access Control setup process. A threat actor can exploit this vulnerability to force the device to connect to a SSID or cause a denial of service.","status":"published","published":"2021-08-03T15:15:08.343Z","modified":"2026-06-17T03:45:40.283Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.4,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:06:56.562207Z"}]}}