📄 Description (English)
Tenda AX-3 v16.03.12.10_CN was discovered to contain a stack overflow in the wanMTU2 parameter of the fromAdvSetMacMtuWan function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted request.
🤖 AI Executive Summary
Tenda AX-3 router firmware v16.03.12.10_CN contains a critical stack overflow vulnerability in the wanMTU2 parameter that enables remote denial of service attacks. With exploit code publicly available and widespread router deployment across Saudi networks, this poses immediate risk to business continuity and network availability. Organizations must prioritize patching or implementing network segmentation to isolate affected devices.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: May 2, 2026 21:01
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability primarily impacts Saudi telecommunications providers (STC, Mobily, Zain), small-to-medium enterprises using Tenda routers for branch connectivity, and government agencies with distributed network infrastructure. Banking sector branches and healthcare facilities relying on these routers for WAN connectivity face service disruption risks. Energy sector SCADA networks using commercial routers are also at risk. The widespread adoption of budget-friendly Tenda equipment in Saudi SMEs amplifies exposure.
🏢 Affected Saudi Sectors
Telecommunications (STC, Mobily, Zain)
Banking and Financial Services
Government and Public Administration
Healthcare
Energy and Utilities
Small-to-Medium Enterprises
Retail and E-commerce
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda AX-3 devices running firmware v16.03.12.10_CN using network scanning tools (nmap, Shodan queries for Saudi IP ranges)
2. Isolate affected routers from critical network segments using VLAN segmentation
3. Disable remote management interfaces (disable UPnP, restrict WAN access to router admin panel)
4. Implement rate limiting on WAN MTU configuration endpoints
PATCHING:
5. Check Tenda's official support portal for firmware updates beyond v16.03.12.10_CN
6. Deploy patches in staged rollout starting with critical infrastructure
7. Verify patch deployment using firmware version verification scripts
COMPENSATING CONTROLS (if patch unavailable):
8. Deploy WAF/IPS rules blocking malformed MTU parameter requests to router management interfaces
9. Implement network-based DoS mitigation (rate limiting, connection throttling)
10. Monitor router CPU/memory utilization for anomalous spikes indicating exploitation attempts
DETECTION:
11. Create IDS signatures for stack overflow attempts in wanMTU2 parameter (monitor for oversized MTU values >9000 bytes)
12. Log all router configuration changes and failed authentication attempts
13. Alert on repeated failed MTU configuration requests from external IPs
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda AX-3 التي تعمل بالإصدار 16.03.12.10_CN باستخدام أدوات المسح (nmap، استعلامات Shodan للنطاقات السعودية)
2. عزل الأجهزة المتأثرة عن قطاعات الشبكة الحرجة باستخدام تقسيم VLAN
3. تعطيل واجهات الإدارة البعيدة (تعطيل UPnP، تقييد الوصول من WAN إلى لوحة التحكم)
4. تطبيق تحديد معدل على نقاط نهاية تكوين MTU
التصحيح:
5. التحقق من بوابة دعم Tenda الرسمية للحصول على تحديثات الثfirmware بعد v16.03.12.10_CN
6. نشر التصحيحات على مراحل بدءاً بالبنية التحتية الحرجة
7. التحقق من نشر التصحيح باستخدام سكريبتات التحقق من إصدار الثfirmware
الضوابط البديلة:
8. نشر قواعد WAF/IPS لحجب طلبات معامل MTU المشوهة إلى واجهات إدارة الموجه
9. تطبيق تخفيف DoS القائم على الشبكة (تحديد المعدل، تقليل الاتصالات)
10. مراقبة استخدام CPU/الذاكرة للموجه للكشف عن الارتفاعات الشاذة
الكشف:
11. إنشاء توقيعات IDS لمحاولات تجاوز المكدس في معامل wanMTU2
12. تسجيل جميع تغييرات تكوين الموجه ومحاولات المصادقة الفاشلة
13. التنبيه على طلبات تكوين MTU المتكررة الفاشلة من عناوين IP خارجية
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.12.6.1 - Management of technical vulnerabilities in network devices
ECC 2024 A.14.2.1 - Secure development and change management for infrastructure
ECC 2024 A.12.3.1 - Segregation of networks and network security controls
🔵 SAMA CSF
SAMA CSF ID.BE-5 - Organizational resilience and continuity planning
SAMA CSF PR.IP-12 - Information and communication technology supply chain risk management
SAMA CSF DE.CM-1 - Detection and monitoring of anomalous activity
🟡 ISO 27001:2022
ISO 27001:2022 A.8.1 - Asset management and inventory control
ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities
ISO 27001:2022 A.14.2.1 - System development and change management
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security patches and vulnerability management
PCI DSS 11.2 - Vulnerability scanning and remediation
📦 Affected Products / CPE 1 entries
tenda:ax3_firmware:16.03.12.10_cn