CVE-2021-22130 : What You Need to Know

A stack-based buffer overflow vulnerability in Fortinet FortiProxy CLI versions 2.0.0 to 2.0.1, 1.2.0 to 1.2.9, 1.1.0 to 1.1.6, 1.0.0 to 1.0.7 could allow a remote attacker to cause a Denial of Service by exploiting a specific command. Fortinet has not reported any cases of code execution resulting from this vulnerability.

Understanding CVE-2021-22130

This section provides insight into the nature of CVE-2021-22130, including its impact, technical details, and mitigation strategies.

What is CVE-2021-22130?

CVE-2021-22130 is a stack-based buffer overflow vulnerability found in Fortinet FortiProxy physical appliances that could potentially be exploited by a remote attacker to trigger a Denial of Service.

The Impact of CVE-2021-22130

The vulnerability has a CVSS base score of 6.7, indicating a medium severity issue. Attack complexity is low, but confidentiality, integrity, and availability impacts are high. Successful exploitation requires high privileges and can result in a DoS attack.

Technical Details of CVE-2021-22130

This section delves into the specific technical aspects of the vulnerability.

Vulnerability Description

The vulnerability arises from a stack-based buffer overflow in the FortiProxy CLI versions specified, potentially triggered through a specific command, leading to a system crash.

Affected Systems and Versions

Fortinet FortiProxy versions 2.0.0 to 2.0.1, 1.2.0 to 1.2.9, 1.1.0 to 1.1.6, and 1.0.0 to 1.0.7 are impacted by this vulnerability.

Exploitation Mechanism

An authenticated, remote attacker can exploit this vulnerability by running a specific command (

diagnose sys cpuset

) with a large cpuset mask value, causing a buffer overflow and potential DoS condition.

Mitigation and Prevention

This section outlines steps to address and prevent exploitation of CVE-2021-22130.

Immediate Steps to Take

Affected users should apply relevant security patches from Fortinet promptly and restrict CLI access to only necessary personnel to limit potential attack vectors.

Long-Term Security Practices

Regularly updating systems, restricting remote access, and maintaining network security best practices can help mitigate similar vulnerabilities in the future.

Patching and Updates

Stay informed about security advisories from Fortinet and promptly apply patches and updates to ensure systems are protected against known vulnerabilities.