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Vulnerabilities

CVE-2026-20401

High
In Modem, there is a possible system crash due to an uncaught exception. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no
CWE-617 — Weakness Type
Published: Feb 2, 2026  ·  Modified: Feb 28, 2026  ·  Source: NVD
CVSS v3
7.5
🔗 NVD Official
📄 Description (English)

In Modem, there is a possible system crash due to an uncaught exception. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01738310; Issue ID: MSV-5933.

🤖 AI Executive Summary

CVE-2026-20401 is a high-severity denial of service vulnerability in MediaTek NR15 modem firmware affecting mobile devices. An attacker controlling a rogue base station can trigger a system crash through an uncaught exception, requiring no user interaction or special privileges. This vulnerability poses significant risk to Saudi telecommunications infrastructure and mobile users, particularly given the prevalence of MediaTek modems in budget and mid-range devices widely used across the Kingdom.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 3, 2026 14:37
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability directly impacts Saudi Arabia's telecommunications sector, particularly STC, Mobily, and Zain which operate extensive 4G/5G networks. The risk extends to government agencies using mobile devices for critical communications, healthcare institutions relying on mobile connectivity for patient data, and financial institutions with mobile banking services. Budget and mid-range smartphones prevalent in Saudi consumer market are most vulnerable. Potential for widespread service disruptions affecting millions of users across the Kingdom, with particular concern for emergency services and critical infrastructure communications.
🏢 Affected Saudi Sectors
Telecommunications (STC, Mobily, Zain) Government and Public Administration Banking and Financial Services Healthcare Energy and Utilities Consumer Mobile Users
⚖️ Saudi Risk Score (AI)
7.8
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all devices using MediaTek NR15 modems in your organization through device inventory and MDM solutions
2. Coordinate with telecommunications providers (STC, Mobily, Zain) for modem firmware update availability and deployment timeline
3. Issue security advisory to all users advising against connecting to unknown or suspicious base stations
4. Monitor network for unusual base station activity or rogue AP indicators

PATCHING GUIDANCE:
1. Apply MediaTek patch MOLY01738310 immediately when available through device manufacturer OTA updates
2. Prioritize devices in critical roles (government, healthcare, banking) for early patching
3. Coordinate with device manufacturers (Xiaomi, Oppo, Vivo, Realme, etc.) for firmware release timelines
4. Establish patch deployment schedule with telecommunications carriers

COMPENSATING CONTROLS (if patch unavailable):
1. Implement network-level monitoring for rogue base station detection using IMSI catchers detection tools
2. Deploy mobile device management (MDM) policies restricting automatic network selection
3. Enforce manual network selection and user awareness training
4. Monitor for sudden device crashes and correlate with network events
5. Implement network segmentation for critical communications

DETECTION RULES:
1. Monitor for sudden device reboots/crashes correlated with network connection events
2. Alert on connections to base stations with suspicious characteristics (weak signal, unusual identifiers)
3. Track firmware versions of deployed devices and flag outdated MediaTek NR15 versions
4. Implement SIEM rules for abnormal modem behavior patterns
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع الأجهزة التي تستخدم مودمات MediaTek NR15 في مؤسستك من خلال جرد الأجهزة وحلول MDM
2. التنسيق مع مزودي خدمات الاتصالات (STC، Mobily، Zain) لتوفر تحديثات برامج ثبات المودم وجدول النشر
3. إصدار تنبيه أمني لجميع المستخدمين ينصحهم بعدم الاتصال بمحطات قاعدة غير معروفة أو مريبة
4. مراقبة الشبكة للكشف عن نشاط محطات قاعدة وهمية أو مؤشرات نقاط وصول غير مصرح بها

إرشادات التصحيح:
1. تطبيق تصحيح MediaTek MOLY01738310 فوراً عند توفره من خلال تحديثات OTA من الشركة المصنعة للجهاز
2. إعطاء الأولوية للأجهزة في الأدوار الحرجة (حكومة، رعاية صحية، بنوك) للتصحيح المبكر
3. التنسيق مع الشركات المصنعة للأجهزة للحصول على جداول إصدار البرامج الثابتة
4. وضع جدول نشر التصحيحات مع شركات الاتصالات

الضوابط البديلة (إذا لم يكن التصحيح متاحاً):
1. تنفيذ مراقبة على مستوى الشبكة للكشف عن محطات القاعدة الوهمية باستخدام أدوات الكشف عن IMSI catchers
2. نشر سياسات إدارة الأجهزة المحمولة (MDM) تقيد الاختيار التلقائي للشبكة
3. فرض الاختيار اليدوي للشبكة وتدريب المستخدمين على الوعي الأمني
4. مراقبة انهيارات الأجهزة المفاجئة وربطها بأحداث الشبكة
5. تنفيذ تقسيم الشبكة للاتصالات الحرجة

قواعد الكشف:
1. مراقبة إعادة تشغيل الأجهزة المفاجئة/الانهيارات المرتبطة بأحداث الاتصال بالشبكة
2. التنبيه على الاتصالات بمحطات قاعدة بخصائص مريبة (إشارة ضعيفة، معرفات غير عادية)
3. تتبع إصدارات البرامج الثابتة للأجهزة المنتشرة والإشارة إلى إصدارات MediaTek NR15 القديمة
4. تنفيذ قواعد SIEM لأنماط سلوك المودم غير الطبيعية
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.12.6.1 - Management of technical vulnerabilities ECC 2024 A.12.2.1 - Change management procedures ECC 2024 A.14.2.1 - Secure development policy ECC 2024 A.16.1.5 - Response to information security incidents
🔵 SAMA CSF
ID.RA-1 - Asset management and criticality assessment PR.IP-12 - Security patches and updates DE.CM-8 - Vulnerability scans RS.RP-1 - Response planning
🟡 ISO 27001:2022
A.12.3.1 - Segregation of development, test and production environments A.14.2.1 - Secure development policy and procedures A.12.6.1 - Management of technical vulnerabilities A.16.1.5 - Assessment and decision on information security incidents
🟣 PCI DSS v4.0.1
Requirement 6.2 - Security patches for system components Requirement 11.2 - Vulnerability scanning
📦 Affected Products / CPE 1 entries
mediatek:nr15:-
📊 CVSS Score
7.5
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityN — None / Network
IntegrityN — None / Network
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score7.5
CWECWE-617
EPSS0.08%
Exploit No
Patch ✓ Yes
Published 2026-02-02
Source Feed nvd
Views 5
🇸🇦 Saudi Risk Score
7.8
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-617
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