CVE-2021-37273 : Security Advisory and Response

China Telecom Corporation EPON Tianyi Gateway ZXHN F450(EPON ONU) 3.0 is affected by a Denial of Service vulnerability. Attackers can exploit this issue to repeatedly restart the device.

Understanding CVE-2021-37273

This CVE pertains to a specific Denial of Service vulnerability in the China Telecom Corporation EPON Tianyi Gateway ZXHN F450(EPON ONU) 3.0.

What is CVE-2021-37273?

The CVE-2021-37273 CVE ID is assigned to a Denial of Service vulnerability present in the China Telecom Corporation EPON Tianyi Gateway ZXHN F450(EPON ONU) 3.0. This device serves as a hardware terminal for the 'Optical Modem Smart Router'. Exploiting this vulnerability allows attackers to initiate multiple restarts of the device, causing a denial of service.

The Impact of CVE-2021-37273

The impact of this vulnerability is significant as attackers can disrupt the normal operation of the China Telecom Corporation EPON Tianyi Gateway ZXHN F450(EPON ONU) 3.0 by repeatedly restarting the device. This could lead to service unavailability and potential financial losses for affected users.

Technical Details of CVE-2021-37273

This section will cover the technical aspects of the CVE.

Vulnerability Description

The vulnerability allows threat actors to trigger multiple restarts of the EPON Tianyi Gateway ZXHN F450(EPON ONU) 3.0, thus causing a Denial of Service condition.

Affected Systems and Versions

The China Telecom Corporation EPON Tianyi Gateway ZXHN F450(EPON ONU) 3.0 with all versions is affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability to remotely initiate repeated restarts of the affected device, leading to service disruption.

Mitigation and Prevention

For managing and preventing the exploitation of CVE-2021-37273, the following steps are recommended:

Immediate Steps to Take

Update the firmware to the latest version provided by the vendor.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all network devices to address known vulnerabilities.
Conduct security awareness training for network users to recognize and report potential security threats.

Patching and Updates

Keep track of security advisories from the vendor and promptly apply patches or updates to eliminate vulnerabilities and enhance the security posture of the network.