CVE-2021-40284 : Exploit Details and Defense Strategies

This CVE-2021-40284 article provides details about a buffer overflow vulnerability affecting D-Link DSL-3782 EU routers.

Understanding CVE-2021-40284

D-Link DSL-3782 EU v1.01:EU v1.03 is vulnerable to a buffer overflow leading to denial of service.

What is CVE-2021-40284?

A buffer overflow vulnerability in the web interface "/cgi-bin/New_GUI/Igmp.asp"
Remote attackers can trigger the vulnerability via a long string in 'igmpsnoopEnable' parameter

The Impact of CVE-2021-40284

Allows authenticated remote attackers to cause a denial of service

Technical Details of CVE-2021-40284

The following technical aspects describe the vulnerability in detail.

Vulnerability Description

Buffer overflow in D-Link DSL-3782 EU v1.01:EU v1.03
Triggered by sending a long string to 'igmpsnoopEnable' parameter

Affected Systems and Versions

Vendor: D-Link
Product: DSL-3782 EU
Versions Affected: v1.01 through v1.03

Exploitation Mechanism

Authenticated remote attackers exploit the vulnerability through an HTTP request

Mitigation and Prevention

Following are the necessary steps to mitigate and prevent exploitation of CVE-2021-40284.

Immediate Steps to Take

Apply vendor-supplied patches
Disable remote access if not required
Monitor network traffic for signs of exploitation

Long-Term Security Practices

Keep systems up to date with the latest firmware
Regularly review security advisories from D-Link

Patching and Updates

Stay informed about patches from D-Link
Apply updates promptly to address the vulnerability