📄 Description (English)
A vulnerability has been found in Tenda F456 1.0.0.5. This affects the function fromWrlclientSet of the file /goform/WrlclientSet of the component httpd. The manipulation leads to 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 buffer overflow vulnerability exists in Tenda F456 router firmware (version 1.0.0.5) affecting the httpd component's WrlclientSet function. The vulnerability allows remote unauthenticated attackers to execute arbitrary code with CVSS 8.8 severity. With public exploit availability and no patch currently available, this poses immediate risk to organizations using this router model in Saudi Arabia.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 30, 2026 23:30
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability critically impacts Saudi organizations across multiple sectors: Telecommunications (STC, Mobily, Zain) using Tenda routers in network infrastructure; Banking and Financial Services relying on these devices for branch connectivity; Government agencies (NCA, CITC) managing network perimeters; Healthcare institutions using Tenda equipment for facility networks; Energy sector (ARAMCO, utilities) with industrial network segments. SMEs and enterprises across Saudi Arabia are particularly vulnerable due to widespread Tenda router deployment in cost-effective network solutions. The lack of authentication requirement makes this exploitable from the internet, enabling mass compromise campaigns.
🏢 Affected Saudi Sectors
Telecommunications
Banking and Financial Services
Government
Healthcare
Energy and Utilities
Small and Medium Enterprises
Retail
Education
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda F456 devices running firmware 1.0.0.5 in your network using asset discovery tools
2. Isolate affected devices from internet-facing networks immediately or restrict WAN access
3. Implement network segmentation to limit lateral movement if compromise occurs
4. Monitor for exploitation attempts using IDS/IPS signatures
PATCHING GUIDANCE:
1. Check Tenda's official website for firmware updates beyond 1.0.0.5
2. If update available, schedule immediate patching during maintenance windows
3. If no patch available, consider device replacement with alternative vendors (Cisco, Fortinet, Ubiquiti)
COMPENSATING CONTROLS (if patching delayed):
1. Disable remote management features on affected devices
2. Implement strict firewall rules blocking access to port 80/443 from untrusted networks
3. Deploy WAF rules blocking requests to /goform/WrlclientSet endpoint
4. Enable router authentication and change default credentials
5. Implement network-based IPS rules to detect buffer overflow patterns
DETECTION RULES:
1. Monitor HTTP POST requests to /goform/WrlclientSet with abnormally large payloads (>1024 bytes)
2. Alert on any successful code execution attempts from WAN interface
3. Track firmware version changes on Tenda devices
4. Monitor for unexpected process spawning from httpd service
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda F456 التي تعمل بالإصدار 1.0.0.5 في شبكتك باستخدام أدوات اكتشاف الأصول
2. عزل الأجهزة المتأثرة عن الشبكات المتصلة بالإنترنت فوراً أو تقييد الوصول من WAN
3. تنفيذ تقسيم الشبكة لتحديد الحركة الجانبية في حالة الاختراق
4. مراقبة محاولات الاستغلال باستخدام توقيعات IDS/IPS
إرشادات التصحيح:
1. تحقق من موقع Tenda الرسمي للحصول على تحديثات البرنامج الثابت بعد الإصدار 1.0.0.5
2. إذا كان التحديث متاحاً، قم بجدولة التصحيح الفوري خلال نوافذ الصيانة
3. إذا لم يكن التصحيح متاحاً، فكر في استبدال الجهاز بموردين بدائل
الضوابط التعويضية:
1. تعطيل ميزات الإدارة البعيدة على الأجهزة المتأثرة
2. تنفيذ قواعد جدار الحماية الصارمة لحظر الوصول إلى المنافذ من الشبكات غير الموثوقة
3. نشر قواعد WAF لحظر الطلبات إلى نقطة نهاية WrlclientSet
4. تفعيل مصادقة جهاز التوجيه وتغيير بيانات الاعتماد الافتراضية
5. تنفيذ قواعد IPS المستندة إلى الشبكة للكشف عن أنماط تجاوز المخزن المؤقت
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.8.1.1 - Asset management and inventory control
A.8.2.1 - Classification of information
A.12.2.1 - Restrictions on software installation
A.12.6.1 - Management of technical vulnerabilities
A.14.2.1 - Secure development policy
🔵 SAMA CSF
ID.AM-1 - Physical devices and software assets are inventoried
PR.IP-12 - A vulnerability management plan is developed and implemented
DE.CM-8 - Vulnerability scans are performed
RS.MI-2 - Incidents are mitigated
🟡 ISO 27001:2022
A.12.3.1 - Segregation of development, test and production environments
A.12.6.1 - Management of technical vulnerabilities
A.14.2.1 - Secure development policy
A.8.1.1 - Asset management
🟣 PCI DSS v4.0.1
Requirement 6.2 - Ensure security patches are installed
Requirement 11.2 - Run automated vulnerability scans
Requirement 1.1 - Firewall configuration standards
🔗 References & Sources 5
🔗
https://github.com/Litengzheng/vuldb_new/blob/main/F456/vul_139/README.md
cna@vuldb.com
Exploit
Vendor Advisory
🔗
https://vuldb.com/submit/798474
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://vuldb.com/vuln/359676
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://vuldb.com/vuln/359676/cti
cna@vuldb.com
Permissions Required
VDB Entry
🔗
https://www.tenda.com.cn/
cna@vuldb.com
Product
📦 Affected Products / CPE 1 entries
tenda:f456_firmware:1.0.0.5