📄 Description (English)
A vulnerability has been found in Tenda CH22 1.0.0.1/1.If. The impacted element is the function fromSetCfm of the file /goform/setcfm of the component Parameter Handler. The manipulation of the argument funcname leads to stack-based buffer overflow. Remote exploitation of the attack is possible. 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 CH22 router firmware (versions 1.0.0.1/1.0) affecting the parameter handler component. The vulnerability allows remote attackers to execute arbitrary code by manipulating the 'funcname' argument in the /goform/setcfm endpoint. With a CVSS score of 8.8 and public exploit disclosure, this poses an immediate threat to organizations using affected Tenda devices, particularly in Saudi Arabia where these routers are commonly deployed in enterprise and government networks.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 23, 2026 16:05
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi organizations across multiple sectors: (1) Banking & Financial Services - Tenda routers used in branch networks and ATM connectivity; (2) Government & NCA - Critical infrastructure and administrative networks; (3) Healthcare - Hospital networks and medical device connectivity; (4) Energy Sector - ARAMCO and utilities using these devices for network segmentation; (5) Telecommunications - STC and other telecom providers using Tenda equipment; (6) Education - Universities and research institutions. The lack of available patches combined with public exploit disclosure creates an immediate exploitation risk, particularly for organizations with limited network monitoring capabilities.
🏢 Affected Saudi Sectors
Banking & Financial Services
Government & Public Administration
Healthcare & Medical Services
Energy & Utilities
Telecommunications
Education & Research
Retail & E-commerce
Manufacturing & Industrial
🎯 MITRE ATT&CK Techniques
T1190 - Exploit Public-Facing Application (remote exploitation of /goform/setcfm endpoint)
T1068 - Exploitation for Privilege Escalation (buffer overflow leading to code execution)
T1543 - Create or Modify System Process (arbitrary code execution on router)
T1547 - Boot or Logon Autostart Execution (persistence through firmware modification)
T1021 - Remote Services (lateral movement through compromised router)
T1040 - Traffic Sniffing (network access from compromised router)
T1557 - Man-in-the-Middle (potential MITM attacks from compromised device)
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda CH22 devices in your network using network scanning tools (nmap, Shodan queries for Saudi IP ranges)
2. Isolate affected devices from critical network segments if possible
3. Implement network-level access controls restricting access to /goform/setcfm endpoint
4. Enable enhanced logging on network perimeter devices
COMPENSATING CONTROLS (until patch available):
1. Deploy Web Application Firewall (WAF) rules blocking requests to /goform/setcfm with suspicious funcname parameters
2. Implement rate limiting on the /goform/setcfm endpoint
3. Restrict administrative access to Tenda devices to specific trusted IP addresses only
4. Disable remote management features if not required
5. Place Tenda devices behind a reverse proxy with input validation
DETECTION RULES:
1. Monitor for HTTP POST requests to /goform/setcfm with funcname parameter containing special characters or excessive length (>256 bytes)
2. Alert on any stack trace errors or segmentation faults from Tenda devices
3. Monitor for unexpected process execution or privilege escalation attempts originating from Tenda device IP addresses
4. Track firmware version inventory and flag any unauthorized modifications
PATCHING STRATEGY:
1. Contact Tenda support for security updates (no patch currently available)
2. Prepare contingency plan for device replacement if patches are not released within 30 days
3. Evaluate alternative router solutions from vendors with active security support
4. Document all affected devices and their criticality levels
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda CH22 في شبكتك باستخدام أدوات المسح (nmap، استعلامات Shodan للنطاقات السعودية)
2. عزل الأجهزة المتأثرة عن القطاعات الحرجة في الشبكة إن أمكن
3. تطبيق ضوابط الوصول على مستوى الشبكة لتقييد الوصول إلى نقطة النهاية /goform/setcfm
4. تفعيل السجلات المحسّنة على أجهزة محيط الشبكة
الضوابط البديلة (حتى توفر التصحيح):
1. نشر قواعد جدار حماية تطبيقات الويب (WAF) لحجب الطلبات إلى /goform/setcfm مع معاملات funcname مريبة
2. تطبيق تحديد معدل على نقطة النهاية /goform/setcfm
3. تقييد الوصول الإداري إلى أجهزة Tenda إلى عناوين IP موثوقة محددة فقط
4. تعطيل ميزات الإدارة البعيدة إذا لم تكن مطلوبة
5. وضع أجهزة Tenda خلف وكيل عكسي مع التحقق من صحة المدخلات
قواعد الكشف:
1. مراقبة طلبات HTTP POST إلى /goform/setcfm مع معامل funcname يحتوي على أحرف خاصة أو طول مفرط (>256 بايت)
2. تنبيهات على أي أخطاء في تتبع المكدس أو أخطاء الانقسام من أجهزة Tenda
3. مراقبة تنفيذ العمليات غير المتوقعة أو محاولات تصعيد الامتيازات من عناوين IP لأجهزة Tenda
4. تتبع جرد إصدار البرنامج الثابت والإشارة إلى أي تعديلات غير مصرح بها
استراتيجية التصحيح:
1. الاتصال بدعم Tenda للحصول على تحديثات الأمان (لا يوجد تصحيح متاح حالياً)
2. إعداد خطة طوارئ لاستبدال الجهاز إذا لم يتم إصدار التصحيحات خلال 30 يوماً
3. تقييم حلول جهاز التوجيه البديلة من البائعين الذين يتمتعون بدعم أمان نشط
4. توثيق جميع الأجهزة المتأثرة ومستويات أهميتها
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information Security Policies (network device security requirements)
A.8.1.1 - User Endpoint Devices (router security and management)
A.8.2.1 - Privileged Access Rights (administrative access controls to network devices)
A.8.3.1 - Information Access Restriction (network segmentation and access control)
A.12.2.1 - Change Management (firmware and configuration updates)
A.12.6.1 - Management of Technical Vulnerabilities (vulnerability assessment and remediation)
🔵 SAMA CSF
Identify (ID) - Asset Management: Inventory and classification of network devices
Protect (PR) - Access Control: Restrict access to vulnerable endpoints
Protect (PR) - Data Security: Network segmentation to limit exposure
Detect (DE) - Anomalies and Events: Monitor for exploitation attempts
Respond (RS) - Response Planning: Incident response procedures for compromised routers
Recover (RC) - Recovery Planning: Business continuity for network infrastructure
🟡 ISO 27001:2022
A.5.1 - Management Direction for Information Security (security policies for network infrastructure)
A.8.1 - User Endpoint Devices (security of network devices)
A.8.2 - Privileged Access Rights (administrative access controls)
A.8.3 - Information Access Restriction (network access controls)
A.12.2 - Change Management (firmware updates and patches)
A.12.6 - Management of Technical Vulnerabilities (vulnerability management)
A.13.1 - Network Security (network architecture and segmentation)
🟣 PCI DSS v4.0.1
Requirement 1.1 - Firewall Configuration Standards (network device security)
Requirement 2.1 - Default Passwords (router administrative access)
Requirement 6.2 - Security Patches (firmware updates)
Requirement 11.2 - Vulnerability Scanning (network device assessment)