📄 Description (English)
A flaw has been found in Tenda F456 1.0.0.5. The impacted element is the function fromNatlimitof of the file /goform/Natlimit of the component httpd. Executing a manipulation can lead to buffer overflow. The attack may be launched remotely. The exploit has been published 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 NAT limit function. The flaw allows remote attackers to execute arbitrary code without authentication, with public exploits already available. This poses immediate risk to organizations using these routers for network perimeter security.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 30, 2026 23:48
🇸🇦 Saudi Arabia Impact Assessment
High impact for Saudi banking sector (SAMA-regulated institutions), government agencies (NCA oversight), and critical infrastructure operators. Tenda routers are widely deployed in SMEs and branch offices across Saudi Arabia. Compromised routers enable lateral movement into internal networks, data exfiltration, and persistent backdoor installation. Telecom operators (STC, Mobily) and energy sector (ARAMCO subsidiaries) face supply chain risks if routers are used in network infrastructure. Government entities relying on these devices for secure network segmentation are particularly vulnerable.
🏢 Affected Saudi Sectors
Banking and Financial Services
Government and Public Administration
Telecommunications
Energy and Utilities
Healthcare
Small and Medium Enterprises
Critical Infrastructure
🎯 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 network scanning tools
2. Isolate affected routers from critical network segments if possible
3. Implement network-level access controls to restrict access to router management interfaces (port 80/443)
4. Monitor router logs for suspicious /goform/Natlimit requests
PATCHING GUIDANCE:
1. Check Tenda support portal for firmware updates beyond 1.0.0.5
2. If no patch available, plan immediate replacement with alternative vendor routers
3. Document all affected devices for compliance reporting
COMPENSATING CONTROLS:
1. Deploy WAF/IPS rules to block malicious /goform/Natlimit requests
2. Restrict router management access to specific IP ranges only
3. Implement network segmentation to limit router compromise impact
4. Enable router authentication and change default credentials
5. Monitor for exploitation attempts using IDS signatures
DETECTION RULES:
1. Alert on POST requests to /goform/Natlimit with oversized payloads
2. Monitor for unexpected process execution from httpd service
3. Track failed authentication attempts to router management interface
4. Flag unusual outbound connections from router IP addresses
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda F456 التي تعمل بالإصدار 1.0.0.5 في شبكتك باستخدام أدوات المسح
2. عزل الأجهزة المتأثرة عن قطاعات الشبكة الحرجة إن أمكن
3. تطبيق عناصر تحكم الوصول على مستوى الشبكة لتقييد الوصول إلى واجهات إدارة الجهاز
4. مراقبة سجلات الجهاز للطلبات المريبة إلى /goform/Natlimit
توجيهات التصحيح:
1. التحقق من بوابة دعم Tenda للحصول على تحديثات البرنامج الثابت
2. إذا لم يكن هناك تصحيح متاح، خطط للاستبدال الفوري بأجهزة من بائعين بدلاء
3. توثيق جميع الأجهزة المتأثرة لإعداد التقارير
عناصر التحكم البديلة:
1. نشر قواعد WAF/IPS لحجب طلبات /goform/Natlimit الضارة
2. تقييد وصول إدارة الجهاز إلى نطاقات IP محددة فقط
3. تطبيق تقسيم الشبكة لتحديد تأثير اختراق الجهاز
4. تفعيل المصادقة وتغيير بيانات الاعتماد الافتراضية
5. مراقبة محاولات الاستغلال باستخدام توقيعات IDS
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.8.1 - Asset Management and Inventory
ECC 2024 A.12.6 - Change Management
ECC 2024 A.13.1 - Network Security
ECC 2024 A.14.2 - System Development and Maintenance
🔵 SAMA CSF
SAMA CSF ID.AM-1 - Physical and Cyber Assets
SAMA CSF PR.DS-6 - Data Security
SAMA CSF DE.CM-1 - Detection Processes
SAMA CSF RS.MI-1 - Incident Response
🟡 ISO 27001:2022
ISO 27001:2022 A.5.19 - Addressing Information Security in Supplier Relationships
ISO 27001:2022 A.8.1 - Inventory of Assets
ISO 27001:2022 A.8.2 - Ownership of Assets
ISO 27001:2022 A.12.6 - Change Management
🟣 PCI DSS v4.0.1
PCI DSS 1.1 - Firewall Configuration Standards
PCI DSS 6.2 - Security Patches and Updates
PCI DSS 11.3 - Penetration Testing
🔗 References & Sources 5
🔗
https://github.com/Litengzheng/vuldb_new/blob/main/F456/vul_138/README.md
cna@vuldb.com
Exploit
Third Party Advisory
🔗
https://vuldb.com/submit/798473
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://vuldb.com/vuln/359675
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://vuldb.com/vuln/359675/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