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CVE-2025-21452: Transient Denial of Service Vulnerability in LTE Networks

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Overview

CVE-2025-21452 is a significant security vulnerability affecting the reliability and integrity of LTE networks. The flaw could potentially enable an attacker to trigger a transient Denial of Service (DoS) condition by processing a Random-Access Response (RAR) with an invalid Protocol Data Unit (PDU) length. The severity of this risk underscores the critical need for affected entities to implement mitigation strategies immediately.

Vulnerability Summary

CVE ID: CVE-2025-21452
Severity: High (CVSS 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Transient DoS condition, potential system compromise, and data leakage

Affected Products

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Product | Affected Versions

LTE Networks | All Versions

How the Exploit Works

An attacker exploiting this vulnerability would send a specially crafted RAR with an invalid PDU length to an LTE network. The system, upon receiving and attempting to process the malformed RAR, may experience a transient DoS condition. This vulnerability could allow an attacker to disrupt network connectivity temporarily, potentially causing system compromise or data leakage.

Conceptual Example Code

An example of how an attack might look in pseudocode:

def exploit(target):
# Create a random-access response with an invalid PDU length
rar = RandomAccessResponse(invalid_pdu_length)
# Send the malicious RAR to the target LTE network
send_rar(target, rar)

This code sends a malicious RAR to a target LTE network, potentially causing a transient DoS condition.

Mitigation Guidance

Entities operating on LTE networks should apply the vendor-provided patch to fix this vulnerability as soon as possible. If immediate patching is not feasible, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be employed as temporary mitigation measures to detect and block attempts to exploit this vulnerability.

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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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