📄 Description (English)
A flaw has been found in Tenda F451 1.0.0.7. Affected by this vulnerability is the function WrlclientSet of the file /goform/WrlclientSet of the component httpd. This manipulation of the argument GO causes stack-based buffer overflow. The attack may be initiated remotely. The exploit has been published and may be used.
🤖 AI Executive Summary
A critical stack-based buffer overflow vulnerability exists in Tenda F451 router firmware (version 1.0.0.7) affecting the WrlclientSet HTTP handler. The flaw allows remote attackers to execute arbitrary code by sending specially crafted requests with oversized GO parameters. With CVSS 8.8 and published exploit details, this poses immediate risk to organizations using Tenda routers for network access and perimeter security.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 23, 2026 02:50
🇸🇦 Saudi Arabia Impact Assessment
Saudi organizations across multiple sectors face significant risk: Government agencies and NCA infrastructure using Tenda routers for network segmentation; Banking sector (SAMA-regulated institutions) relying on Tenda devices for branch connectivity and VPN termination; Telecom operators (STC, Mobily, Zain) using Tenda equipment in enterprise networks; Healthcare facilities using these routers for medical device network isolation; Energy sector (ARAMCO, utilities) deploying Tenda in operational technology networks. The lack of available patches creates persistent vulnerability exposure.
🏢 Affected Saudi Sectors
Government
Banking
Telecommunications
Healthcare
Energy
Critical Infrastructure
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.6
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Inventory all Tenda F451 devices running firmware 1.0.0.7 across network infrastructure
2. Isolate affected routers from internet-facing positions; move to internal-only network segments if possible
3. Implement network segmentation to restrict access to WrlclientSet endpoint (/goform/WrlclientSet)
4. Enable detailed logging on affected devices and upstream security appliances
COMPENSATING CONTROLS (until patch available):
5. Deploy WAF/IPS rules blocking HTTP requests with oversized GO parameters to /goform/WrlclientSet
6. Implement strict input validation at network perimeter for all traffic to affected routers
7. Restrict administrative access to router management interfaces via VPN/bastion hosts only
8. Monitor for exploitation attempts using IDS signatures detecting stack overflow patterns
DETECTION RULES:
- Alert on POST/GET requests to /goform/WrlclientSet with GO parameter exceeding 256 bytes
- Monitor for unexpected process execution or memory corruption events on router
- Track failed authentication attempts and unusual HTTP status codes from affected devices
LONG-TERM:
9. Evaluate replacement with patched Tenda firmware or alternative vendor solutions
10. Subscribe to Tenda security advisories for patch availability
11. Establish firmware update testing procedures for critical network devices
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حصر جميع أجهزة Tenda F451 التي تعمل بالإصدار 1.0.0.7 عبر البنية التحتية للشبكة
2. عزل الأجهزة المتأثرة عن المواضع المواجهة للإنترنت؛ نقلها إلى قطاعات الشبكة الداخلية فقط إن أمكن
3. تطبيق تقسيم الشبكة لتقييد الوصول إلى نقطة نهاية WrlclientSet
4. تفعيل السجلات التفصيلية على الأجهزة المتأثرة وأجهزة الأمان العلوية
الضوابط البديلة:
5. نشر قواعد WAF/IPS لحجب طلبات HTTP بمعاملات GO كبيرة الحجم
6. تطبيق التحقق الصارم من صحة المدخلات على محيط الشبكة
7. تقييد الوصول الإداري عبر VPN/bastion hosts فقط
8. مراقبة محاولات الاستغلال باستخدام توقيعات IDS
قواعد الكشف:
- تنبيهات على طلبات POST/GET إلى /goform/WrlclientSet بمعاملات GO تتجاوز 256 بايت
- مراقبة تنفيذ العمليات غير المتوقعة على الجهاز
- تتبع محاولات المصادقة الفاشلة
المدى الطويل:
9. تقييم استبدال الأجهزة بحلول بديلة
10. الاشتراك في تنبيهات أمان Tenda
11. إنشاء إجراءات اختبار تحديثات البرامج الثابتة
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.12.6.1 - Management of technical vulnerabilities
ECC 2024 A.14.2.1 - Secure development policy
ECC 2024 A.12.2.1 - Monitoring and logging of network access
🔵 SAMA CSF
SAMA CSF ID.RA-1 - Asset management and vulnerability identification
SAMA CSF PR.IP-12 - Security patch management
SAMA CSF DE.CM-1 - Detection and monitoring of anomalous activity
🟡 ISO 27001:2022
ISO 27001:2022 A.12.2.1 - Monitoring and logging
ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities
ISO 27001:2022 A.14.2.1 - Secure development and change management
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security patches and updates
PCI DSS 11.2 - Vulnerability scanning and assessment