{"id":86278,"date":"2026-01-13T18:42:05","date_gmt":"2026-01-13T18:42:05","guid":{"rendered":""},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-30T00:00:00","slug":"cve-2025-20666-remote-denial-of-service-exploit-in-modem","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-20666-remote-denial-of-service-exploit-in-modem\/","title":{"rendered":"CVE-2025-20666: Remote Denial of Service Exploit in Modem<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

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.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-20666
\nSeverity: High (7.5 CVSS)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: System crash, potential for remote DoS, possible system compromise or data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Modem | All versions prior to patch MOLY00650610<\/p>\n

How the Exploit Works<\/strong><\/p>\n

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.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

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.<\/p>\n

# Rogue base station sends malformed packet to connected UE\necho -n \"malformed_packet\" | nc -u -w1 target_IP target_port<\/code><\/pre>\n
This command sends a malformed packet to the target, potentially causing the uncaught exception which leads to the system crash.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
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.<\/p>\n","protected":false},"excerpt":{"rendered":"
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 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-86278","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t