CVE-2021-25477 : Vulnerability Insights and Analysis

This article provides detailed information about CVE-2021-25477, an improper error handling vulnerability in Mediatek RRC Protocol stack on Samsung Mobile Devices that could lead to a modem crash and remote denial of service.

Understanding CVE-2021-25477

CVE-2021-25477 is a vulnerability that affects Samsung Mobile Devices due to improper error handling in Mediatek RRC Protocol stack before SMR Oct-2021 Release 1. The vulnerability can be exploited to cause a modem crash and enable remote denial of service attacks.

What is CVE-2021-25477?

The vulnerability in Mediatek RRC Protocol stack prior to SMR Oct-2021 Release 1 allows attackers to trigger a modem crash, resulting in a remote denial of service.

The Impact of CVE-2021-25477

The impact of CVE-2021-25477 is rated as MEDIUM based on CVSS v3.1 scoring. It has a base score of 4.4, with a HIGH attack complexity and availability impact. While no confidentiality or integrity impact is identified, the privileges required for exploitation are rated as HIGH.

Technical Details of CVE-2021-25477

This section covers specific technical details related to CVE-2021-25477.

Vulnerability Description

The vulnerability arises from improper error handling in the Mediatek RRC Protocol stack, allowing attackers to crash the modem and conduct remote denial of service attacks on Samsung Mobile Devices.

Affected Systems and Versions

Samsung Mobile Devices running versions P(9.0), Q(10.0), and R(11.0) prior to SMR Oct-2021 Release 1 are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability over a network without requiring user interaction, affecting the availability of the targeted devices.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-25477, immediate steps, long-term security practices, and patching recommendations are crucial.

Immediate Steps to Take

Users are advised to update their Samsung Mobile Devices to SMR Oct-2021 Release 1 or later to eliminate the vulnerability. Implementing network security measures can also help mitigate the risk of exploitation.

Long-Term Security Practices

Regularly updating devices, implementing security best practices, and staying informed about potential vulnerabilities are essential for maintaining a secure mobile environment.

Patching and Updates

Samsung Mobile users should regularly check for security updates provided by the manufacturer to address known vulnerabilities and enhance the security posture of their devices.