📄 Description (English)
A vulnerability was determined in Tenda CH22 1.0.0.1. Affected is the function formWebTypeLibrary of the file /goform/webtypelibrary of the component Parameter Handler. This manipulation of the argument webSiteId causes stack-based buffer overflow. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized.
🤖 AI Executive Summary
A critical stack-based buffer overflow vulnerability exists in Tenda CH22 firmware version 1.0.0.1 affecting the web parameter handler. The vulnerability allows remote attackers to execute arbitrary code by manipulating the webSiteId parameter, with public exploits already available. This poses an immediate threat to organizations using Tenda networking equipment, particularly in Saudi Arabia where such devices are commonly deployed in enterprise and government networks.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 23, 2026 16:03
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi telecommunications infrastructure (STC, Mobily), government agencies under NCA oversight, and banking sector networks (SAMA-regulated institutions). Tenda CH22 devices are commonly used as network access points and routers in enterprise environments. Successful exploitation could lead to complete network compromise, unauthorized access to sensitive data, and lateral movement within critical infrastructure. The lack of available patches creates an extended exposure window for Saudi organizations.
🏢 Affected Saudi Sectors
Telecommunications (STC, Mobily, Zain)
Government Agencies (NCA, CITC oversight)
Banking and Financial Services (SAMA-regulated)
Energy Sector (ARAMCO, utilities)
Healthcare (MOH facilities)
Education (Universities, schools)
Enterprise Networks (General)
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.9
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda CH22 devices running firmware 1.0.0.1 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 web management interface (typically port 80/443)
4. Disable remote management access to affected devices
5. Monitor for exploitation attempts using IDS/IPS signatures
PATCHING GUIDANCE:
1. Check Tenda's official website for firmware updates beyond 1.0.0.1
2. If updates available, schedule immediate patching during maintenance windows
3. Test patches in non-production environment first
COMPENSATING CONTROLS (if no patch available):
1. Implement strict firewall rules limiting access to device management interfaces
2. Use VPN or jump hosts for administrative access only
3. Deploy WAF rules to block malicious webSiteId parameter patterns
4. Implement network-based IPS signatures for buffer overflow attempts
5. Change default credentials and enforce strong authentication
6. Monitor device logs for suspicious parameter values
DETECTION RULES:
1. Alert on POST requests to /goform/webtypelibrary with oversized webSiteId parameters
2. Monitor for stack corruption indicators in device logs
3. Track failed authentication attempts and unusual parameter values
4. Implement behavioral analysis for abnormal device activity post-exploitation
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda CH22 التي تعمل بالإصدار 1.0.0.1 في شبكتك باستخدام أدوات المسح
2. عزل الأجهزة المتأثرة عن القطاعات الحرجة في الشبكة إن أمكن
3. تطبيق تقسيم الشبكة لتقييد الوصول إلى واجهة الإدارة (المنافذ 80/443)
4. تعطيل الوصول الإداري البعيد للأجهزة المتأثرة
5. مراقبة محاولات الاستغلال باستخدام توقيعات IDS/IPS
إرشادات التصحيح:
1. التحقق من موقع Tenda الرسمي للحصول على تحديثات البرنامج الثابت
2. إذا كانت التحديثات متاحة، جدولة التصحيح الفوري
3. اختبار التحديثات في بيئة غير الإنتاج أولاً
الضوابط البديلة:
1. تطبيق قواعد جدار الحماية الصارمة لتقييد الوصول إلى واجهات الإدارة
2. استخدام VPN أو أجهزة الوصول للإدارة فقط
3. نشر قواعد WAF لحجب أنماط معاملات webSiteId الضارة
4. تطبيق توقيعات IPS لمحاولات تجاوز المخزن المؤقت
5. تغيير بيانات الاعتماد الافتراضية وفرض المصادقة القوية
6. مراقبة سجلات الجهاز للقيم المريبة
📋 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 - System and Communications Protection
Detect - Security Monitoring and Incident Detection
Respond - Incident Response and Management
🟡 ISO 27001:2022
A.5.1 - Policies for information security
A.6.1 - Internal organization
A.6.2 - Mobile device and teleworking
A.8.1 - User endpoint devices
A.8.2 - Privileged access rights
A.8.3 - Information access restriction
A.12.6 - Management of technical vulnerabilities
🟣 PCI DSS v4.0.1
Requirement 1 - Install and maintain network security controls
Requirement 2 - Apply secure configurations
Requirement 6 - Develop and maintain secure systems
Requirement 11 - Test security systems regularly
🔗 References & Sources 5
🔗
https://github.com/Litengzheng/vuldb_new/blob/main/CH22/vul_49/README.md
cna@vuldb.com
Exploit
Third Party Advisory
🔗
https://vuldb.com/submit/780209
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://vuldb.com/vuln/354332
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://vuldb.com/vuln/354332/cti
cna@vuldb.com
Permissions Required
VDB Entry
🔗
https://www.tenda.com.cn/
cna@vuldb.com
Product
📦 Affected Products / CPE 1 entries
tenda:ch22_firmware:1.0.0.1