📄 Description (English)
A vulnerability was detected in Tenda F456 1.0.0.5. Impacted is the function fromSafeUrlFilter of the file /goform/SafeUrlFilter of the component httpd. The manipulation of the argument page results in buffer overflow. The attack may be performed from remote. The exploit is now 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 SafeUrlFilter function, allowing remote attackers to execute arbitrary code without authentication. The vulnerability has a CVSS score of 8.8 and poses significant risk to Saudi organizations relying on Tenda routers for network perimeter security. With public exploit availability and no patch currently available, immediate mitigation is required.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 29, 2026 17:49
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses critical risk to Saudi banking sector (SAMA-regulated institutions), government agencies (NCA oversight), and telecommunications providers (STC, Mobily) that deploy Tenda F456 routers as edge devices. Healthcare facilities and energy sector organizations using these routers for network segmentation are also at high risk. The buffer overflow enables remote code execution (RCE) without authentication, potentially allowing attackers to establish persistent access, exfiltrate sensitive data, or launch lateral movement attacks into critical infrastructure networks.
🏢 Affected Saudi Sectors
Banking and Financial Services (SAMA-regulated)
Government and Public Administration (NCA oversight)
Telecommunications (STC, Mobily, Zain)
Healthcare and Medical Facilities
Energy and Utilities (ARAMCO, SEC)
Education and Universities
Retail and E-commerce
Manufacturing and Industrial Control Systems
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda F456 devices in your network using network scanning tools (nmap, Shodan queries)
2. Isolate affected devices from production networks if possible, or implement network segmentation
3. Monitor for exploitation attempts using IDS/IPS signatures detecting buffer overflow patterns
4. Disable remote management features on affected routers via web interface
5. Implement firewall rules to restrict access to port 80/443 on Tenda devices to trusted networks only
COMPENSATING CONTROLS:
6. Deploy WAF rules to block requests with oversized 'page' parameters to /goform/SafeUrlFilter
7. Implement network-based detection: alert on HTTP POST requests to /goform/SafeUrlFilter with payload >1024 bytes
8. Enable logging on all Tenda devices and forward logs to SIEM for analysis
9. Consider replacing Tenda F456 with alternative vendors (Cisco, Fortinet, Juniper) pending patch availability
10. Implement network segmentation to limit router compromise impact
DETECTION RULES:
- Monitor for POST requests to /goform/SafeUrlFilter with abnormally large 'page' parameter values
- Alert on any successful authentication to router admin panel from unexpected IP ranges
- Track firmware version changes on Tenda devices
- Monitor for process execution or shell spawning from httpd process
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda F456 في شبكتك باستخدام أدوات المسح (nmap، استعلامات Shodan)
2. عزل الأجهزة المتأثرة عن شبكات الإنتاج إن أمكن، أو تطبيق تقسيم الشبكة
3. مراقبة محاولات الاستغلال باستخدام توقيعات IDS/IPS التي تكتشف أنماط تجاوز المخزن المؤقت
4. تعطيل ميزات الإدارة البعيدة على أجهزة Tenda المتأثرة عبر واجهة الويب
5. تطبيق قواعد جدار الحماية لتقييد الوصول إلى المنافذ 80/443 على أجهزة Tenda للشبكات الموثوقة فقط
الضوابط التعويضية:
6. نشر قواعد WAF لحظر الطلبات ذات معاملات 'page' كبيرة الحجم إلى /goform/SafeUrlFilter
7. تطبيق الكشف القائم على الشبكة: تنبيه على طلبات HTTP POST إلى /goform/SafeUrlFilter بحمولة >1024 بايت
8. تفعيل التسجيل على جميع أجهزة Tenda وإعادة توجيه السجلات إلى SIEM للتحليل
9. النظر في استبدال Tenda F456 بموردين بدائل (Cisco، Fortinet، Juniper) في انتظار توفر التصحيح
10. تطبيق تقسيم الشبكة لتحديد تأثير اختراق الجهاز
قواعد الكشف:
- مراقبة طلبات POST إلى /goform/SafeUrlFilter بقيم معامل 'page' كبيرة بشكل غير طبيعي
- تنبيه على أي مصادقة ناجحة لوحة تحكم الجهاز من نطاقات IP غير متوقعة
- تتبع تغييرات إصدار البرنامج الثابت على أجهزة Tenda
- مراقبة تنفيذ العملية أو توليد shell من عملية httpd
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Network security perimeter controls
ECC 2024 A.5.1.2 - Boundary protection mechanisms
ECC 2024 A.5.2.1 - Access control to network services
ECC 2024 A.5.3.1 - Segregation of networks
ECC 2024 A.6.2.1 - Vulnerability management and patching
🔵 SAMA CSF
SAMA CSF ID.BE-1 - Asset management and inventory
SAMA CSF PR.AC-1 - Access control policy and procedures
SAMA CSF PR.DS-6 - Data security and encryption
SAMA CSF DE.CM-1 - Detection and monitoring capabilities
SAMA CSF RS.MI-1 - Incident response and mitigation
🟡 ISO 27001:2022
ISO 27001:2022 A.5.1 - Policies for information security
ISO 27001:2022 A.5.15 - Access control
ISO 27001:2022 A.5.16 - Cryptography
ISO 27001:2022 A.8.1 - User endpoint devices
ISO 27001:2022 A.8.2 - Privileged access rights
ISO 27001:2022 A.8.6 - Access control to information
🟣 PCI DSS v4.0.1
PCI DSS 1.1 - Firewall configuration standards
PCI DSS 1.2 - Network segmentation
PCI DSS 2.1 - Default security parameters
PCI DSS 6.2 - Security patches and updates
PCI DSS 11.2 - Vulnerability scanning
🔗 References & Sources 6
🔗
https://github.com/Litengzheng/vuldb_new/blob/main/F456/vul_127/README.md
cna@vuldb.com
Exploit
Third Party Advisory
🔗
https://vuldb.com/submit/798458
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://vuldb.com/submit/798462
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://vuldb.com/vuln/359629
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://vuldb.com/vuln/359629/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