📄 Description (English)
A vulnerability has been found in Tenda FH451 1.0.0.9. This vulnerability affects the function WrlclientSet of the file /goform/WrlclientSet. Such manipulation of the argument GO leads to stack-based buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.
🤖 AI Executive Summary
A critical stack-based buffer overflow vulnerability exists in Tenda FH451 wireless router firmware (version 1.0.0.9) affecting the WrlclientSet function. The vulnerability allows remote attackers to execute arbitrary code by manipulating the 'GO' parameter, potentially compromising network infrastructure. With CVSS 8.8 and public exploit disclosure, this poses immediate risk to organizations using affected Tenda equipment.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 23, 2026 11:49
🇸🇦 Saudi Arabia Impact Assessment
High impact on Saudi telecommunications sector (STC, Mobily, Zain) and government agencies using Tenda equipment for network infrastructure. Banking sector (SAMA-regulated institutions) at risk if routers used in branch networks or remote access infrastructure. Healthcare organizations and critical infrastructure operators using Tenda FH451 for network connectivity face potential compromise. Small and medium enterprises (SMEs) across all sectors represent significant exposure due to widespread adoption of budget-friendly Tenda equipment in Saudi market.
🏢 Affected Saudi Sectors
Telecommunications (STC, Mobily, Zain)
Banking and Financial Services
Government and Public Administration
Healthcare
Energy and Utilities
Small and Medium Enterprises (SMEs)
Education
Retail and E-commerce
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.5
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda FH451 devices in your network using asset inventory tools
2. Isolate affected devices from critical network segments if possible
3. Implement network segmentation to limit router access to trusted administrative networks only
4. Monitor router logs for suspicious WrlclientSet requests
PATCHING GUIDANCE:
1. Check Tenda support portal for firmware updates beyond 1.0.0.9
2. If no patch available, consider replacing affected devices with alternative vendors
3. Contact Tenda support directly for security advisory and timeline
COMPENSATING CONTROLS:
1. Restrict administrative access to router management interface (disable remote management)
2. Implement firewall rules blocking external access to router management ports (typically 80, 443, 8080)
3. Change default credentials immediately and enforce strong passwords
4. Disable UPnP if not required
5. Enable router firewall and configure strict inbound rules
DETECTION RULES:
1. Monitor for HTTP POST requests to /goform/WrlclientSet with 'GO' parameter containing unusual characters or excessive length
2. Alert on stack overflow patterns in router logs
3. Monitor for unexpected router reboots or process crashes
4. Track failed authentication attempts to router management interface
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda FH451 في شبكتك باستخدام أدوات جرد الأصول
2. عزل الأجهزة المتأثرة عن أجزاء الشبكة الحرجة إن أمكن
3. تنفيذ تقسيم الشبكة لتحديد وصول جهاز التوجيه للشبكات الإدارية الموثوقة فقط
4. مراقبة سجلات جهاز التوجيه للطلبات المريبة إلى WrlclientSet
إرشادات التصحيح:
1. التحقق من بوابة دعم Tenda للحصول على تحديثات البرامج الثابتة بعد الإصدار 1.0.0.9
2. إذا لم يكن هناك تصحيح متاح، فكر في استبدال الأجهزة المتأثرة بموردين بدلاء
3. التواصل مع دعم Tenda مباشرة للحصول على استشارة أمنية والجدول الزمني
الضوابط البديلة:
1. تقييد الوصول الإداري إلى واجهة إدارة جهاز التوجيه (تعطيل الإدارة البعيدة)
2. تنفيذ قواعد جدار الحماية لحظر الوصول الخارجي إلى منافذ إدارة جهاز التوجيه
3. تغيير بيانات الاعتماد الافتراضية فوراً وفرض كلمات مرور قوية
4. تعطيل UPnP إذا لم تكن مطلوبة
5. تفعيل جدار حماية جهاز التوجيه وتكوين قواعد صارمة للوصول الداخلي
قواعد الكشف:
1. مراقبة طلبات HTTP POST إلى /goform/WrlclientSet مع معامل 'GO' يحتوي على أحرف غير عادية أو طول مفرط
2. التنبيه على أنماط تجاوز المكدس في سجلات جهاز التوجيه
3. مراقبة إعادة تشغيل جهاز التوجيه غير المتوقعة أو أعطال العملية
4. تتبع محاولات المصادقة الفاشلة لواجهة إدارة جهاز التوجيه
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information security policies and procedures
A.5.2.1 - Access control and authentication
A.5.3.1 - Cryptography and secure communications
A.5.4.1 - Physical and environmental security
A.5.5.1 - Operations security and change management
A.5.6.1 - Communications security
A.5.7.1 - System development and maintenance
🔵 SAMA CSF
Governance - Risk Management Framework
Protect - Access Control and Authentication
Protect - Network Security
Detect - Monitoring and Logging
Respond - Incident Response Procedures
🟡 ISO 27001:2022
A.5.1.1 - Policies for information security
A.5.2.1 - Information security roles and responsibilities
A.5.3.1 - Segregation of duties
A.6.1.1 - Internal organization
A.6.2.1 - Mobile device and teleworking
A.7.1.1 - Physical entry
A.8.1.1 - User endpoint devices
A.8.2.1 - Privileged access rights
A.8.3.1 - Information access restriction
A.8.6.1 - Access control for change of user privileges
🟣 PCI DSS v4.0.1
Requirement 1 - Install and maintain a firewall configuration
Requirement 2 - Do not use vendor-supplied defaults
Requirement 6 - Develop and maintain secure systems and applications
Requirement 8 - Identify and authenticate access to network resources