CVE-2021-3254 : Exploit Details and Defense Strategies

This article provides an overview of CVE-2021-3254, a vulnerability in Asus DSL-N14U-B1 1.1.2.3_805 that allows remote attackers to perform a Denial of Service (DoS) attack via a TCP SYN scan using nmap.

Understanding CVE-2021-3254

CVE-2021-3254 is a security vulnerability in Asus DSL-N14U-B1 1.1.2.3_805 that can be exploited by attackers to disrupt the normal functioning of the device by sending malicious TCP SYN packets.

What is CVE-2021-3254?

CVE-2021-3254 refers to the specific identifier assigned to the Denial of Service (DoS) vulnerability found in Asus DSL-N14U-B1 1.1.2.3_805. Attackers can leverage this vulnerability to disrupt the availability of the device through a TCP SYN scan using nmap.

The Impact of CVE-2021-3254

The impact of CVE-2021-3254 can lead to service disruption on the affected device, potentially causing downtime and affecting the user experience. This vulnerability can be exploited remotely, making it a critical security concern.

Technical Details of CVE-2021-3254

Here are the technical details related to CVE-2021-3254:

Vulnerability Description

The vulnerability allows remote attackers to launch a Denial of Service (DoS) attack by sending malicious TCP SYN packets, particularly using nmap.

Affected Systems and Versions

Asus DSL-N14U-B1 1.1.2.3_805 is affected by this vulnerability. Other versions or products may not be impacted.

Exploitation Mechanism

The vulnerability can be exploited by sending a TCP SYN scan using nmap, which triggers the Denial of Service (DoS) condition on the device.

Mitigation and Prevention

To safeguard against CVE-2021-3254, consider the following measures:

Immediate Steps to Take

Monitor network traffic for any signs of suspicious activity, especially an influx of TCP SYN packets.
Implement network-level protections to filter out potential malicious traffic.

Long-Term Security Practices

Keep systems and devices up to date with the latest security patches and firmware updates.
Regularly review and update firewall rules to enhance network security.

Patching and Updates

Check with the device manufacturer for any available patches or updates that address the CVE-2021-3254 vulnerability to ensure the security of your device.