CVE-2021-36186 Explained : Impact and Mitigation
Learn about CVE-2021-36186, a stack-based buffer overflow vulnerability in Fortinet FortiWeb versions allowing execution of unauthorized code. Find mitigation steps and impacts.
A stack-based buffer overflow vulnerability in Fortinet FortiWeb versions 6.4.0, 6.3.15, and below, as well as 6.2.5 and below, allows attackers to execute unauthorized code or commands through crafted HTTP requests.
Understanding CVE-2021-36186
This section delves into the specifics of the CVE-2021-36186 vulnerability.
What is CVE-2021-36186?
The CVE-2021-36186 vulnerability is a stack-based buffer overflow in Fortinet FortiWeb versions that enables threat actors to run unauthorized code or commands via manipulated HTTP requests.
The Impact of CVE-2021-36186
The impact of CVE-2021-36186 is severe, with a CVSS base score of 8.3 out of 10, categorized as high severity. Attackers can exploit this vulnerability to compromise confidentiality, integrity, and availability of affected systems.
Technical Details of CVE-2021-36186
This section provides a detailed examination of the technical aspects related to CVE-2021-36186.
Vulnerability Description
A stack-based buffer overflow in Fortinet FortiWeb versions 6.4.0, 6.3.15, and below, as well as 6.2.5 and below, allows attackers to execute unauthorized code or commands via crafted HTTP requests.
Affected Systems and Versions
The vulnerability impacts Fortinet FortiWeb versions 6.4.0, 6.3.15, and prior versions, as well as 6.2.5 and earlier releases.
Exploitation Mechanism
To exploit CVE-2021-36186, threat actors send specially crafted HTTP requests to the vulnerable FortiWeb instances, triggering the stack-based buffer overflow and enabling unauthorized code execution.
Mitigation and Prevention
This section outlines the measures to mitigate and prevent exploitation of CVE-2021-36186.
Immediate Steps to Take
Immediately apply patches or updates provided by Fortinet to address the vulnerability in FortiWeb versions 6.4.0, 6.3.15, and below, and 6.2.5 and below.
Long-Term Security Practices
Maintain security best practices, such as network segmentation, access control, and regular security assessments, to enhance overall cybersecurity posture.
Patching and Updates
Regularly monitor Fortinet security advisories and apply patches promptly to ensure protection against known vulnerabilities.