CVE-2021-27252 : Vulnerability Insights and Analysis

This CVE-2021-27252 article provides an in-depth analysis of a critical vulnerability affecting NETGEAR R7800 routers.

Understanding CVE-2021-27252

This section delves into the specifics of the CVE-2021-27252 vulnerability.

What is CVE-2021-27252?

The vulnerability allows network-adjacent attackers to execute arbitrary code on NETGEAR R7800 firmware version 1.0.2.76 without requiring authentication. The flaw lies in the handling of the DHCP opcode.

The Impact of CVE-2021-27252

With a CVSS base score of 8.8, this high-severity vulnerability poses a significant risk. Attackers can exploit it to gain root access and execute malicious code.

Technical Details of CVE-2021-27252

This section provides technical insights into CVE-2021-27252.

Vulnerability Description

The issue stems from inadequate validation of user-supplied strings, leading to code execution through a system call with escalated privileges.

Affected Systems and Versions

NETGEAR R7800 routers running firmware version 1.0.2.76 are vulnerable to this exploit.

Exploitation Mechanism

Through the mishandling of DHCP opcodes, attackers can craft malicious strings to trigger arbitrary code execution.

Mitigation and Prevention

Discover the critical steps to mitigate the risks associated with CVE-2021-27252.

Immediate Steps to Take

Immediately update the firmware to the latest secure version. Implement network segmentation and restrict external access.

Long-Term Security Practices

Regularly monitor for security advisories, conduct security audits, and enforce strong access control policies.

Patching and Updates

Stay informed about security patches from NETGEAR and apply them promptly to prevent exploitation.