What’s Vulnerable › Vulnerabilities

CVE-2021-27953

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-03 · updated 2026-06-17
• Weakness: CWE-476

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.

Affected products

• Ecobee3 Lite Firmware: 4.5.81.200

References

• https://www.l9group.com/advisories/remote-denial-of-service-of-ecobee3-lite
• https://www.l9group.com/advisories/remote-denial-of-service-of-ecobee3-lite

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