CVE-2021-27953 : Security Advisory and Response
Learn about CVE-2021-27953, a vulnerability in ecobee3 lite 4.5.81.200 allowing a threat actor to cause a denial of service through a crafted HTTP request. Find mitigation steps here.
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.
Understanding CVE-2021-27953
This CVE describes a NULL pointer dereference vulnerability in the ecobee3 lite 4.5.81.200 device, which can be exploited to trigger a denial of service attack.
What is CVE-2021-27953?
CVE-2021-27953 is a vulnerability found in the HomeKit Wireless Access Control setup process of the ecobee3 lite 4.5.81.200 device. It allows a malicious actor to cause a denial of service on the device through a specific HTTP request, leading to a reboot.
The Impact of CVE-2021-27953
Exploiting this vulnerability can result in a denial of service condition on the affected device, disrupting its normal operation and potentially affecting connected services.
Technical Details of CVE-2021-27953
This section provides more insights into the vulnerability.
Vulnerability Description
The ecobee3 lite 4.5.81.200 device is susceptible to a NULL pointer dereference issue during the HomeKit Wireless Access Control setup, enabling an attacker to trigger a denial of service attack.
Affected Systems and Versions
- Product: ecobee3 lite 4.5.81.200
- Vendor: ecobee
- Versions: All versions are affected.
Exploitation Mechanism
By sending a specially crafted HTTP request to the device during the HomeKit Wireless Access Control setup process, an attacker can exploit the NULL pointer dereference vulnerability, causing the device to reboot.
Mitigation and Prevention
To safeguard systems against CVE-2021-27953, immediate actions and long-term security practices are recommended.
Immediate Steps to Take
- Apply vendor-supplied patches or updates promptly to mitigate the vulnerability.
- Monitor network traffic for any suspicious activities targeting the affected device.
Long-Term Security Practices
- Regularly update device firmware to protect against known vulnerabilities.
- Implement network segmentation and access controls to minimize the attack surface.
Patching and Updates
Stay informed about security advisories and updates from ecobee to apply relevant patches for addressing CVE-2021-27953.