📄 Description (English)
A vulnerability was detected in Tenda F451 1.0.0.7. Affected is the function fromDhcpListClient of the file /goform/DhcpListClient of the component httpd. The manipulation of the argument page results in stack-based buffer overflow. The attack can be launched remotely. The exploit is now public and may be used.
🤖 AI Executive Summary
A critical stack-based buffer overflow vulnerability exists in Tenda F451 router firmware (version 1.0.0.7) affecting the DHCP client list function. The vulnerability allows remote attackers to execute arbitrary code by manipulating the 'page' parameter without authentication. With CVSS 8.8 and public exploit availability, this poses immediate risk to organizations using Tenda routers for network infrastructure.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 23, 2026 02:50
🇸🇦 Saudi Arabia Impact Assessment
Saudi organizations using Tenda F451 routers face critical risk, particularly: (1) Government agencies and NCA infrastructure relying on these routers for network perimeter defense; (2) Banking sector (SAMA-regulated) using Tenda devices in branch networks or remote access infrastructure; (3) Telecom operators (STC, Mobily, Zain) potentially deploying these routers in customer premises equipment (CPE); (4) Healthcare facilities using Tenda routers for medical device network segmentation; (5) Energy sector (ARAMCO, utilities) with industrial control network access points. Remote code execution enables lateral movement, data exfiltration, and network compromise without authentication.
🏢 Affected Saudi Sectors
Government and Public Administration (NCA, NCSC)
Banking and Financial Services (SAMA-regulated institutions)
Telecommunications (STC, Mobily, Zain)
Healthcare and Medical Services
Energy and Utilities (ARAMCO, regional utilities)
Education (universities, research institutions)
Critical Infrastructure (water, transportation)
🎯 MITRE ATT&CK Techniques
T1190 - Exploit Public-Facing Application (remote exploitation of httpd)
T1068 - Exploitation for Privilege Escalation (buffer overflow for code execution)
T1021.001 - Remote Services: RDP (lateral movement post-compromise)
T1059.001 - Command and Scripting Interpreter: PowerShell (post-exploitation)
T1005 - Data from Local System (data exfiltration from compromised router)
T1557.002 - Adversary-in-the-Middle: ARP Cache Poisoning (network interception)
T1040 - Traffic Capture (packet sniffing from router position)
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda F451 devices in your network using network scanning tools (nmap, Shodan queries for Saudi IP ranges)
2. Isolate affected devices from critical network segments immediately
3. Disable remote management access to Tenda devices (disable WAN access to HTTP/HTTPS ports)
4. Implement network segmentation: place Tenda routers in DMZ with strict firewall rules
5. Monitor for exploitation attempts using IDS/IPS signatures detecting buffer overflow patterns in /goform/DhcpListClient requests
PATCHING GUIDANCE:
- No official patch available from Tenda; contact vendor for firmware updates
- Consider replacing Tenda F451 with alternative vendors (Cisco, Fortinet, Juniper) that have active security support
- If replacement not feasible, apply compensating controls immediately
COMPENSATING CONTROLS:
1. Deploy WAF/IPS rules blocking requests to /goform/DhcpListClient endpoint
2. Implement strict input validation at network edge (block oversized 'page' parameters)
3. Restrict HTTP/HTTPS access to Tenda management interface to authorized IPs only
4. Enable detailed logging of all HTTP requests to Tenda devices
5. Implement network-based rate limiting on Tenda device access
DETECTION RULES:
- Alert on POST/GET requests to /goform/DhcpListClient with 'page' parameter > 256 bytes
- Monitor for unusual process execution on Tenda devices (SSH/telnet access attempts)
- Track failed authentication attempts followed by HTTP requests to vulnerable endpoint
- Detect abnormal outbound connections from Tenda device IP addresses
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda F451 في شبكتك باستخدام أدوات المسح (nmap، استعلامات Shodan للنطاقات السعودية)
2. عزل الأجهزة المتأثرة عن قطاعات الشبكة الحرجة فوراً
3. تعطيل الوصول الإداري البعيد (تعطيل وصول WAN إلى منافذ HTTP/HTTPS)
4. تطبيق تقسيم الشبكة: ضع أجهزة Tenda في DMZ مع قواعد جدار حماية صارمة
5. مراقبة محاولات الاستغلال باستخدام توقيعات IDS/IPS التي تكتشف أنماط تجاوز المخزن المؤقت
إرشادات التصحيح:
- لا يوجد تصحيح رسمي من Tenda؛ اتصل بالبائع للحصول على تحديثات البرامج الثابتة
- فكر في استبدال Tenda F451 ببائعين بدائل (Cisco, Fortinet, Juniper) لديهم دعم أمان نشط
- إذا لم يكن الاستبدال ممكناً، طبق الضوابط البديلة فوراً
الضوابط البديلة:
1. نشر قواعد WAF/IPS تحجب الطلبات إلى نقطة نهاية /goform/DhcpListClient
2. تطبيق التحقق الصارم من المدخلات على حافة الشبكة
3. تقييد وصول HTTP/HTTPS إلى واجهة إدارة Tenda للعناوين المصرح بها فقط
4. تفعيل تسجيل مفصل لجميع طلبات HTTP إلى أجهزة Tenda
5. تطبيق تحديد معدل قائم على الشبكة لوصول جهاز Tenda
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Network perimeter security and router security controls
ECC 2024 A.5.1.2 - Access control to network devices
ECC 2024 A.5.1.3 - Monitoring and logging of network device access
ECC 2024 A.6.2.1 - Vulnerability management and patch management
ECC 2024 A.6.2.2 - Security testing and vulnerability assessment
🔵 SAMA CSF
SAMA CSF ID.AM-2 - Hardware and software inventory of network infrastructure
SAMA CSF PR.AC-1 - Access control policies for network devices
SAMA CSF PR.PT-1 - Protective technology deployment (IDS/IPS)
SAMA CSF DE.CM-1 - Network monitoring and anomaly detection
SAMA CSF RS.MI-2 - Incident response and containment procedures
🟡 ISO 27001:2022
ISO 27001:2022 A.5.15 - Access control to information systems
ISO 27001:2022 A.5.16 - Identification and authentication
ISO 27001:2022 A.5.23 - Information security for supplier relationships
ISO 27001:2022 A.8.1 - Cryptography and secure communications
ISO 27001:2022 A.8.2 - Physical and environmental security
🟣 PCI DSS v4.0.1
PCI DSS 1.1 - Firewall configuration standards
PCI DSS 1.2 - Router configuration and security
PCI DSS 2.1 - Default security parameters on network devices
PCI DSS 6.2 - Security patches and updates
PCI DSS 10.2 - Logging and monitoring of network access