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CVE-2025-20703: Modem Out of Bounds Read Leading to DoS Attack

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Overview

CVE-2025-20703 is a security vulnerability present in modems, which can be exploited to perform a remote denial of service attack. This vulnerability is due to an incorrect bounds check that allows a potential out of bounds read in certain situations. The exploitation of this vulnerability can disrupt the operation of the target system, affecting all users connected to the compromised device. This vulnerability is particularly critical as it does not require any additional execution privileges or any form of user interaction.

Vulnerability Summary

CVE ID: CVE-2025-20703
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Remote denial of service attack potentially leading to system compromise or data leakage

Affected Products

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Product | Affected Versions

Modem | All versions prior to patch MOLY01599794

How the Exploit Works

The vulnerability arises from an incorrect bounds check in the modem software. This allows an attacker, who has control over a rogue base station to which the User Equipment (UE) has connected, to induce an out of bounds read. This can result in a denial of service condition, with potential repercussions including system compromise or data leakage.

Conceptual Example Code

Consider the following pseudo-code example:

if (modem.connects_to_base_station(rogue_base_station)) {
data = modem.read(bounds_not_checked);
if (data) {
trigger_denial_of_service();
}
}

The above pseudo-code illustrates how an attacker controlling a rogue base station can trigger an out of bounds read, leading to a denial of service condition.

Mitigation Guidance

Users are advised to apply the vendor patch, identified as MOLY01599794, to rectify this vulnerability. If the patch cannot be applied immediately, users can deploy a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as a temporary mitigation until the patch is installed. These measures can help to detect and block any potential exploitation attempts.

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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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