CVE-2021-27665 : What You Need to Know

An integer overflow vulnerability tracked as CVE-2021-27665 has been identified in the exacqVision Web Service by Johnson Controls. This vulnerability could potentially be exploited by an unauthenticated remote user to cause a denial-of-service condition.

Understanding CVE-2021-27665

This section provides insight into the impact, technical details, and mitigation strategies related to CVE-2021-27665.

What is CVE-2021-27665?

The CVE-2021-27665 vulnerability involves an integer overflow condition in the exacqVision Server, which, if exploited with a specially crafted script, can lead to a denial-of-service situation.

The Impact of CVE-2021-27665

The impact of CVE-2021-27665 is rated as high, with a CVSS v3.1 base score of 7.5. This vulnerability can be exploited remotely by an unauthenticated user, affecting the availability of the system.

Technical Details of CVE-2021-27665

This section delves deeper into the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability is classified as an integer overflow or wraparound (CWE-190) and can be triggered by a specially crafted script, potentially leading to a denial-of-service scenario.

Affected Systems and Versions

The affected product is the exacqVision Web Service by Johnson Controls, specifically version 21.06.11.0.

Exploitation Mechanism

An unauthenticated remote user can exploit the vulnerability via a specially crafted script, triggering the integer overflow condition and causing a denial-of-service situation.

Mitigation and Prevention

This section outlines the immediate steps to take and long-term security practices to mitigate the risk associated with CVE-2021-27665.

Immediate Steps to Take

Users are advised to upgrade the exacqVision Server 32-bit to version 21.09 or switch to the 64-bit version. The critical software update can be downloaded from the official Software Download location.

Long-Term Security Practices

In addition to applying the software update, organizations should implement security best practices, such as regularly updating systems and conducting security assessments to prevent similar vulnerabilities.

Patching and Updates

Regularly check for security patches and updates from the vendor to ensure that the systems are protected against known vulnerabilities.