{"id":"CVE-2021-27953","aliases":["EUVD-2021-14671","GHSA-xfww-6hgp-m5c5"],"status":"published","title":"A NULL pointer dereference vulnerability exists on the ecobee3 lite 4.5.81.200 device in the...","description":"A NULL pointer dereference vulnerability exists on the ecobee3 lite 4.5.81.200 device in the HomeKit Wireless Access Control setup process. A threat actor can exploit this vulnerability to cause a denial of service, forcing the device to reboot via a crafted HTTP request.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.01674,"percentile":0.77185,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-476"],"published":"2021-08-03T14:36:41Z","modified":"2026-06-17T03:45:40Z","products":[{"vendor":"ecobee","product":"ecobee3_lite_firmware"}],"references":[{"url":"https://www.l9group.com/advisories/remote-denial-of-service-of-ecobee3-lite","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27953"},{"url":"https://github.com/advisories/GHSA-xfww-6hgp-m5c5"}],"sources":{"cve":[{"id":"CVE-2021-27953","description":"A NULL pointer dereference vulnerability exists on the ecobee3 lite 4.5.81.200 device in the HomeKit Wireless Access Control setup process. A threat actor can exploit this vulnerability to cause a denial of service, forcing the device to reboot via a crafted HTTP request.","status":"published","published":"2021-08-03T14:36:41Z","modified":"2024-08-03T21:33:16.977Z","updated_at":"2026-11-02T14:33:04.360272Z"}],"euvd":[{"id":"EUVD-2021-14671","description":"A NULL pointer dereference vulnerability exists on the ecobee3 lite 4.5.81.200 device in the HomeKit Wireless Access Control setup process. A threat actor can exploit this vulnerability to cause a denial of service, forcing the device to reboot via a crafted HTTP request.","status":"published","published":"2021-08-03T14:36:41Z","modified":"2024-08-03T21:33:16Z","updated_at":"2026-11-03T03:24:48.366655Z"}],"ghsa":[{"id":"GHSA-xfww-6hgp-m5c5","title":"A NULL pointer dereference vulnerability exists on the ecobee3 lite 4.5.81.200 device in the...","description":"A NULL pointer dereference vulnerability exists on the ecobee3 lite 4.5.81.200 device in the HomeKit Wireless Access Control setup process. A threat actor can exploit this vulnerability to cause a denial of service, forcing the device to reboot via a crafted HTTP request.","status":"published","published":"2022-05-24T19:09:52Z","modified":"2023-01-30T05:01:12Z","cwes":["CWE-476"],"updated_at":"2026-11-02T14:46:21.550142Z"}],"nvd":[{"id":"CVE-2021-27953","description":"A NULL pointer dereference vulnerability exists on the ecobee3 lite 4.5.81.200 device in the HomeKit Wireless Access Control setup process. A threat actor can exploit this vulnerability to cause a denial of service, forcing the device to reboot via a crafted HTTP request.","status":"published","published":"2021-08-03T15:15:08.297Z","modified":"2026-06-17T03:45:40.167Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:06:56.562207Z"}]}}