CVE-2021-26112 : Vulnerability Insights and Analysis

Fortinet FortiWAN before version 4.5.9 is affected by multiple stack-based buffer overflow vulnerabilities that could potentially allow an unauthenticated attacker to execute arbitrary code. Here is everything you need to know about CVE-2021-26112.

Understanding CVE-2021-26112

This section will discuss the details of the CVE-2021-26112 vulnerability, its impact, technical details, and mitigation strategies.

What is CVE-2021-26112?

The CVE-2021-26112 vulnerability involves multiple stack-based buffer overflow vulnerabilities in both network daemons and the command line interpreter of FortiWAN before version 4.5.9. These vulnerabilities could be exploited by an unauthenticated attacker to corrupt control data in memory and execute arbitrary code through specially crafted requests.

The Impact of CVE-2021-26112

The impact of CVE-2021-26112 is significant, with a base severity rating of 'High' (CVSS score of 7.7). The vulnerability can result in unauthorized code execution, posing a serious threat to the confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2021-26112

Let's delve into the technical aspects of CVE-2021-26112 to understand the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability is a result of stack-based buffer overflow issues in network daemons and the command line interpreter of FortiWAN. These allow attackers to manipulate memory and execute malicious code through crafted requests.

Affected Systems and Versions

Fortinet FortiWAN versions before 4.5.9 are impacted by CVE-2021-26112. Users of these versions should take immediate action to secure their systems.

Exploitation Mechanism

The vulnerability can be exploited by sending specifically crafted requests to the affected network daemons, enabling attackers to corrupt memory and execute arbitrary code on vulnerable systems.

Mitigation and Prevention

In this section, we will explore the steps that can be taken to mitigate the risks associated with CVE-2021-26112 and prevent potential exploitation.

Immediate Steps to Take

Users are advised to apply security patches provided by Fortinet to address the vulnerabilities. Additionally, network segmentation and access controls can help limit the exposure of vulnerable systems.

Long-Term Security Practices

Implementing robust security measures such as regular security assessments, network monitoring, and employee security training can enhance the overall cybersecurity posture against similar threats.

Patching and Updates

Stay informed about security updates and patches released by Fortinet for FortiWAN. Regularly update systems to ensure that they are protected against known vulnerabilities.