CVE-2021-33265 : What You Need to Know

D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability. This vulnerability is triggered via a crafted POST request.

Understanding CVE-2021-33265

This CVE identifies a stack buffer overflow vulnerability in D-Link DIR-809 devices.

What is CVE-2021-33265?

CVE-2021-33265 is a security vulnerability found in the D-Link DIR-809 devices due to improper handling of POST requests, leading to a stack buffer overflow.

The Impact of CVE-2021-33265

Exploitation of this vulnerability could allow an attacker to execute arbitrary code or crash the device, potentially compromising the system's integrity and availability.

Technical Details of CVE-2021-33265

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability exists in the function FUN_80046eb4 in /formSetPortTr, allowing an attacker to exploit a stack buffer overflow through a specially crafted POST request.

Affected Systems and Versions

D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 are affected by this vulnerability.

Exploitation Mechanism

The vulnerability is triggered when a malicious actor sends a specifically crafted POST request to the vulnerable device, resulting in a stack buffer overflow.

Mitigation and Prevention

To safeguard systems from CVE-2021-33265, immediate action and long-term security measures are essential.

Immediate Steps to Take

Users are advised to update the firmware to the latest version provided by D-Link, which addresses the stack buffer overflow vulnerability.

Long-Term Security Practices

Regularly monitor vendor's security bulletins and apply security patches promptly to prevent potential exploitation of vulnerabilities.

Patching and Updates

Stay informed about security updates and patches released by D-Link to protect against known vulnerabilities.