CVE-2020-5761 Explained : Impact and Mitigation

Grandstream HT800 series firmware version 1.0.17.5 and below is vulnerable to CPU exhaustion due to an infinite loop in the TR-069 service, allowing unauthenticated remote attackers to trigger this issue.

Understanding CVE-2020-5761

This CVE identifies a vulnerability in the Grandstream HT800 Series firmware that can lead to CPU exhaustion.

What is CVE-2020-5761?

The CVE-2020-5761 vulnerability is caused by an infinite loop in the TR-069 service of the Grandstream HT800 Series firmware versions 1.0.17.5 and below. Attackers can exploit this by sending a one-character TCP message remotely.

The Impact of CVE-2020-5761

The vulnerability can result in CPU exhaustion, potentially leading to denial of service (DoS) conditions on affected devices.

Technical Details of CVE-2020-5761

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability in the Grandstream HT800 Series firmware allows unauthenticated remote attackers to cause CPU exhaustion through an infinite loop in the TR-069 service.

Affected Systems and Versions

Product: Grandstream HT800 Series
Vendor: Not available
Vulnerable Versions: Versions 1.0.17.5 and below

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a one-character TCP message to the TR-069 service remotely.

Mitigation and Prevention

Protecting systems from CVE-2020-5761 requires immediate action and long-term security measures.

Immediate Steps to Take

Disable TR-069 service if not essential for operations
Implement network segmentation to limit exposure
Monitor network traffic for any suspicious activity

Long-Term Security Practices

Regularly update firmware to the latest version
Conduct security assessments and penetration testing
Educate users on safe practices and security awareness

Patching and Updates

Apply patches provided by Grandstream for the affected firmware versions
Stay informed about security advisories and updates from the vendor