📄 Description (English)
A vulnerability was found in Tenda F451 1.0.0.7. This affects the function fromAddressNat of the file /goform/addressNat of the component httpd. Performing a manipulation of the argument entrys results in stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been made public and could be used.
🤖 AI Executive Summary
A stack-based buffer overflow vulnerability exists in Tenda F451 router firmware (version 1.0.0.7) affecting the httpd component's addressNat function. The vulnerability allows remote attackers to execute arbitrary code by manipulating the 'entrys' parameter, with a CVSS score of 8.8. No patch is currently available, and the exploit has been publicly disclosed, making this a critical threat to network infrastructure.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 22, 2026 23:48
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi organizations relying on Tenda F451 routers for network infrastructure. Primary impact sectors include: Telecom operators (STC, Mobily, Zain) using these devices in network edge deployments; Banking sector (SAMA-regulated institutions) if routers are used in branch connectivity; Government agencies (NCA oversight) managing network perimeters; Healthcare institutions requiring secure network access; Energy sector (ARAMCO, utilities) with industrial network segments. The public exploit availability and lack of patches create immediate risk for unauthorized network access, data exfiltration, and lateral movement within organizational networks.
🏢 Affected Saudi Sectors
Telecommunications (STC, Mobily, Zain)
Banking and Financial Services (SAMA-regulated)
Government and Public Administration (NCA oversight)
Healthcare
Energy and Utilities (ARAMCO, regional utilities)
Retail and E-commerce
Education
Manufacturing
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.9
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda F451 devices running firmware 1.0.0.7 in your network using network scanning tools
2. Isolate affected devices from critical network segments if possible
3. Implement network segmentation to restrict access to the httpd service (port 80/443)
4. Monitor for suspicious HTTP requests to /goform/addressNat endpoint
PATCHING GUIDANCE:
1. Check Tenda's official website for firmware updates beyond 1.0.0.7
2. If no patch available, plan device replacement with alternative vendors (Cisco, Fortinet, Juniper)
3. Document all affected devices and create replacement timeline
COMPENSATING CONTROLS:
1. Deploy WAF (Web Application Firewall) rules to block requests to /goform/addressNat
2. Restrict administrative access to router management interfaces via IP whitelisting
3. Implement network-based IDS/IPS signatures to detect buffer overflow attempts
4. Disable UPnP and unnecessary services on affected devices
5. Change default credentials and enforce strong authentication
DETECTION RULES:
1. Monitor HTTP POST requests to /goform/addressNat with unusually large 'entrys' parameter values
2. Alert on any stack-based exception errors from httpd process
3. Track failed authentication attempts to router management interface
4. Monitor for unexpected process execution from httpd service
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda F451 التي تعمل بالإصدار 1.0.0.7 في شبكتك باستخدام أدوات المسح
2. عزل الأجهزة المتأثرة عن القطاعات الحرجة في الشبكة إن أمكن
3. تطبيق تقسيم الشبكة لتقييد الوصول إلى خدمة httpd (المنافذ 80/443)
4. مراقبة طلبات HTTP المريبة إلى نقطة النهاية /goform/addressNat
إرشادات التصحيح:
1. التحقق من موقع Tenda الرسمي للحصول على تحديثات البرامج الثابتة
2. إذا لم يتوفر تصحيح، خطط لاستبدال الجهاز بموردين بدلاء
3. توثيق جميع الأجهزة المتأثرة وإنشاء جدول زمني للاستبدال
الضوابط التعويضية:
1. نشر قواعد جدار حماية تطبيقات الويب لحظر الطلبات إلى /goform/addressNat
2. تقييد الوصول الإداري لواجهات إدارة الموجه عبر قائمة بيضاء للعناوين
3. تطبيق توقيعات IDS/IPS لكشف محاولات تجاوز المخزن المؤقت
4. تعطيل UPnP والخدمات غير الضرورية
5. تغيير بيانات الاعتماد الافتراضية وفرض مصادقة قوية
قواعد الكشف:
1. مراقبة طلبات HTTP POST إلى /goform/addressNat بقيم معاملات 'entrys' كبيرة بشكل غير عادي
2. تنبيهات على أخطاء المكدس من عملية httpd
3. تتبع محاولات المصادقة الفاشلة لواجهة إدارة الموجه
4. مراقبة تنفيذ العمليات غير المتوقعة من خدمة httpd
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Network security perimeter controls
ECC 2024 A.5.1.2 - Network access control
ECC 2024 A.5.1.3 - Segregation of networks
ECC 2024 A.6.2.1 - Restriction of access to information
ECC 2024 A.8.1.1 - User endpoint devices
ECC 2024 A.8.2.3 - Malware protection
🔵 SAMA CSF
SAMA CSF ID.BE-1 - Asset management
SAMA CSF PR.AC-1 - Access control policy
SAMA CSF PR.AC-3 - Access enforcement
SAMA CSF PR.DS-1 - Data security
SAMA CSF DE.CM-1 - Network monitoring
SAMA CSF RS.MI-1 - Incident response
🟡 ISO 27001:2022
ISO 27001:2022 A.5.1 - Policies for information security
ISO 27001:2022 A.5.15 - Access control
ISO 27001:2022 A.5.16 - Cryptography
ISO 27001:2022 A.5.23 - Information security for supplier relationships
ISO 27001:2022 A.8.1 - User endpoint devices
ISO 27001:2022 A.8.2 - Privileged access rights
🟣 PCI DSS v4.0.1
PCI DSS 1.1 - Firewall configuration standards
PCI DSS 1.2 - Network segmentation
PCI DSS 2.1 - Default security parameters
PCI DSS 6.2 - Security patches and updates
PCI DSS 11.3 - Penetration testing
🔗 References & Sources 6