📄 Description (English)
In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is needed for exploitation. Patch ID: MOLY01088681; Issue ID: MSV-4460.
🤖 AI Executive Summary
CVE-2026-20433 is a critical out-of-bounds write vulnerability in MediaTek modem firmware affecting multiple chipsets used in smartphones and IoT devices. An attacker controlling a rogue base station can remotely escalate privileges without requiring additional execution privileges, though user interaction is needed. With CVSS 8.8 and no patch currently available, this poses significant risk to mobile users and connected devices across Saudi Arabia.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 22, 2026 12:31
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability directly impacts Saudi telecommunications infrastructure, particularly STC, Zain, and Mobily networks where millions of users connect daily. Banking sector faces elevated risk as mobile banking apps could be compromised through rogue base station attacks. Government and military communications using affected MediaTek chipsets are at risk. Healthcare sector IoT devices and ARAMCO operational technology networks using these modems require immediate assessment. The vulnerability affects consumer smartphones, enterprise devices, and critical infrastructure IoT deployments across Saudi Arabia.
🏢 Affected Saudi Sectors
Telecommunications (STC, Zain, Mobily)
Banking and Financial Services
Government and Defense
Healthcare
Energy (ARAMCO)
Critical Infrastructure
Consumer Electronics
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.5
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Inventory all devices using affected MediaTek chipsets (MT2735, MT2737, MT6813, MT6833, MT6833P, MT6835, MT6835T, MT6853, MT6853T, MT6855) across your organization
2. Issue security advisory to all users warning against connecting to untrusted or unfamiliar cellular networks
3. Implement network monitoring to detect rogue base station activity (IMSI catchers)
4. Enable 5G-only mode where available as temporary mitigation
COMPENSATING CONTROLS (until patch available):
5. Deploy mobile threat defense (MTD) solutions on critical devices
6. Implement cellular network anomaly detection systems
7. Restrict device connectivity to known trusted networks only
8. Disable automatic network selection; require manual network connection
9. Monitor for suspicious privilege escalation attempts on affected devices
DETECTION RULES:
10. Alert on unexpected modem firmware modifications or crashes
11. Monitor for unusual system calls from modem processes
12. Track connections to unregistered or suspicious base stations
13. Implement SIEM rules for privilege escalation patterns post-connection
PATCHING STRATEGY:
14. Contact device manufacturers for firmware updates (reference Patch ID: MOLY01088681)
15. Establish expedited patching timeline once patches become available
16. Prioritize patching for government, banking, and healthcare sector devices
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. قم بحصر جميع الأجهزة التي تستخدم مجموعات شرائح MediaTek المتأثرة عبر مؤسستك
2. أصدر تنبيهاً أمنياً لجميع المستخدمين يحذرهم من الاتصال بشبكات خلوية غير موثوقة
3. تنفيذ مراقبة الشبكة للكشف عن نشاط محطات القاعدة الوهمية
4. تفعيل وضع 5G فقط حيث يكون متاحاً كتخفيف مؤقت
الضوابط التعويضية (حتى توفر التصحيح):
5. نشر حلول الدفاع ضد التهديدات المحمولة على الأجهزة الحرجة
6. تنفيذ أنظمة الكشف عن الشذوذ في الشبكة الخلوية
7. تقييد اتصال الجهاز بالشبكات الموثوقة المعروفة فقط
8. تعطيل اختيار الشبكة التلقائي؛ طلب الاتصال اليدوي بالشبكة
9. مراقبة محاولات رفع الامتيازات المريبة على الأجهزة المتأثرة
قواعد الكشف:
10. تنبيه عند تعديلات برنامج ثابت مودم غير متوقعة أو أعطال
11. مراقبة استدعاءات النظام غير العادية من عمليات المودم
12. تتبع الاتصالات بمحطات قاعدة غير مسجلة أو مريبة
13. تنفيذ قواعد SIEM لأنماط رفع الامتيازات بعد الاتصال
استراتيجية التصحيح:
14. اتصل بمصنعي الأجهزة للحصول على تحديثات البرنامج الثابت
15. إنشاء جدول زمني معجل للتصحيح بمجرد توفر التصحيحات
16. أولويات التصحيح لأجهزة القطاع الحكومي والمصرفي والصحي
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information security policies and procedures
A.8.1.1 - User endpoint devices security
A.8.2.1 - Privileged access rights management
A.8.3.1 - Information access restriction
A.13.1.1 - Network security perimeter
A.13.1.3 - Segregation of networks
🔵 SAMA CSF
ID.AM-2 - Software platforms and applications inventory
PR.DS-1 - Data security and privacy protections
PR.PT-1 - Security architecture and design
DE.CM-1 - Network monitoring and detection
RS.MI-1 - Incident response and recovery
🟡 ISO 27001:2022
A.5.1.2 - Information security roles and responsibilities
A.8.1.1 - User endpoint devices
A.8.2.1 - Privileged access rights
A.8.3.1 - Access restriction to information
A.13.1.1 - Network security perimeter
A.14.2.1 - Secure development policy
🟣 PCI DSS v4.0.1
Requirement 1 - Firewall configuration standards
Requirement 2 - Default security parameters
Requirement 6 - Secure development and vulnerability management
Requirement 8 - User identification and authentication
Requirement 10 - Logging and monitoring
📦 Affected Products / CPE 50 entries
mediatek:mt2735_firmware:-
mediatek:mt2737_firmware:-
mediatek:mt6813_firmware:-
mediatek:mt6833_firmware:-
mediatek:mt6833p_firmware:-
mediatek:mt6835_firmware:-
mediatek:mt6835t_firmware:-
mediatek:mt6853_firmware:-
mediatek:mt6853t_firmware:-
mediatek:mt6855_firmware:-
mediatek:mt6855t_firmware:-
mediatek:mt6873_firmware:-
mediatek:mt6875_firmware:-
mediatek:mt6875t_firmware:-
mediatek:mt6877_firmware:-
mediatek:mt6877t_firmware:-
mediatek:mt6877tt_firmware:-
mediatek:mt6878_firmware:-
mediatek:mt6878m_firmware:-
mediatek:mt6879_firmware:-
mediatek:mt6880_firmware:-
mediatek:mt6883_firmware:-
mediatek:mt6885_firmware:-
mediatek:mt6886_firmware:-
mediatek:mt6889_firmware:-
mediatek:mt6890_firmware:-
mediatek:mt6891_firmware:-
mediatek:mt6893_firmware:-
mediatek:mt6895_firmware:-
mediatek:mt6895tt_firmware:-
mediatek:mt6896_firmware:-
mediatek:mt6897_firmware:-
mediatek:mt6899_firmware:-
mediatek:mt6980_firmware:-
mediatek:mt6980d_firmware:-
mediatek:mt6983_firmware:-
mediatek:mt6983t_firmware:-
mediatek:mt6985_firmware:-
mediatek:mt6985t_firmware:-
mediatek:mt6989_firmware:-
mediatek:mt6989t_firmware:-
mediatek:mt6990_firmware:-
mediatek:mt6991_firmware:-
mediatek:mt8668_firmware:-
mediatek:mt8673_firmware:-
mediatek:mt8675_firmware:-
mediatek:mt8676_firmware:-
mediatek:mt8678_firmware:-
mediatek:mt8755_firmware:-
mediatek:mt8771_firmware:-