Cybersecurity · · 2 min read

Understanding CVE-2023-45866: A Critical Bluetooth Vulnerability

Understanding CVE-2023-45866: A Critical Bluetooth Vulnerability

In the realm of cybersecurity, staying informed about the latest vulnerabilities is crucial for maintaining robust defense systems. Today, we delve into CVE-2023-45866, a significant Bluetooth security flaw that has caught the attention of experts and organizations worldwide.

What is CVE-2023-45866?

CVE-2023-45866 is a security vulnerability identified in Bluetooth Human Interface Device (HID) Hosts within BlueZ, a widely used software to handle Bluetooth functionalities in various operating systems​​​​. The essence of this vulnerability lies in an authentication bypass flaw that permits an unauthenticated Peripheral role HID Device to initiate and establish an encrypted connection with a Central role (such as a computer or smartphone) without user interaction or authorization​​​​.

The Technical Details

This vulnerability enables the HID Device to send HID keyboard reports, which could lead to the injection of unauthorized HID messages. Essentially, this opens the door for attackers to connect to susceptible devices and inject keystrokes to execute codes as if they were the victim. It's a critical flaw because it bypasses the usual security measures that require user interaction or consent for such connections​​.

Affected Systems

CVE-2023-45866 has a widespread impact, affecting major operating systems such as Android, Linux, macOS, and iOS. The concern is not limited to personal devices but extends to any system utilizing BlueZ for Bluetooth functionality. An example of an affected package is bluez 5.64-0ubuntu1 in Ubuntu 22.04LTS. Notably, in some cases where CVE-2020-0556 mitigation measures were in place, this Bluetooth HID Hosts issue might have been indirectly addressed​​.

Severity and Risk Assessment

The National Vulnerability Database (NVD) has assigned CVE-2023-45866 a high base score of 8.8, indicating its significant severity. The score is based on various factors including the ease of attack (low complexity), no requirement for special privileges, and no user interaction needed for exploitation. The impact of this vulnerability is high on confidentiality, integrity, and availability, making it a critical issue to address​​.

Weakness Enumeration

The primary weakness associated with CVE-2023-45866 is categorized as CWE-287: Improper Authentication. This classification underlines the nature of the flaw as a failure in the authentication process, allowing unauthorized access​​.

Mitigation and Response

In response to CVE-2023-45866, Apple has rolled out comprehensive security updates across its platforms, addressing this and other vulnerabilities. Users of affected systems are strongly advised to update their software to the latest versions to mitigate the risks associated with this vulnerability​​.


The discovery of CVE-2023-45866 serves as a reminder of the continuous need for vigilance in the digital world. It underscores the importance of regular system updates and the need for robust security protocols, especially in commonly used technologies like Bluetooth. As always, staying informed and proactive is key to safeguarding against such vulnerabilities.

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