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CVE-2025-20666: Remote Denial of Service Exploit in Modem

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Overview

This report discusses the CVE-2025-20666 vulnerability, which affects modem users. This issue is significant due to its potential to cause a system crash and facilitate a remote denial of service (DoS) attack, even without additional execution privileges or user interaction. If a User Equipment (UE) connects to a rogue base station controlled by an attacker, the system could be compromised, leading to possible data leakage.

Vulnerability Summary

CVE ID: CVE-2025-20666
Severity: High (7.5 CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System crash, potential for remote DoS, possible system compromise or data leakage

Affected Products

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Product | Affected Versions

Modem | All versions prior to patch MOLY00650610

How the Exploit Works

The vulnerability works by exploiting an uncaught exception in the modem. When a UE connects to a rogue base station controlled by an attacker, it can trigger this exception leading to a system crash. This crash can then be leveraged to perform a remote denial of service attack. This issue is particularly dangerous as it requires no additional execution privileges or user interaction.

Conceptual Example Code

Here’s a potential example of how the exploit might be triggered. This is a hypothetical scenario and should not be used for malicious purposes.

# Rogue base station sends malformed packet to connected UE
echo -n "malformed_packet" | nc -u -w1 target_IP target_port

This command sends a malformed packet to the target, potentially causing the uncaught exception which leads to the system crash.

Mitigation Guidance

The primary solution to this vulnerability is to apply the vendor patch with ID MOLY00650610. If this isn’t immediately possible, a temporary mitigation could be the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS). These systems can help detect and prevent malicious traffic from reaching the vulnerable modems. However, these are just temporary solutions and the patch should be applied as soon as possible to fully remedy the situation.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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