CVE-2021-27953

HighCVSS 7.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://www.l9group.com/advisories/remote-denial-of-service-of-ecobee3-liteExploit, Third Party Advisory
https://www.l9group.com/advisories/remote-denial-of-service-of-ecobee3-liteExploit, Third Party Advisory

Timeline

Published: Aug 3, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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