📄 Description (English)
A weakness has been identified in Edimax EW-7438RPn 1.31. This impacts the function formAccept of the file /goform/formAccept. Executing a manipulation of the argument submit-url can lead to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
🤖 AI Executive Summary
A critical stack-based buffer overflow vulnerability exists in Edimax EW-7438RPn wireless router firmware version 1.31, exploitable through the /goform/formAccept endpoint via manipulation of the submit-url parameter. The vulnerability allows remote code execution without authentication, posing significant risk to organizations using this device. With public exploit availability and no vendor patch forthcoming, immediate mitigation is essential for Saudi organizations relying on this hardware.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: May 28, 2026 20:13
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses critical risk to Saudi banking sector (SAMA-regulated institutions), government agencies (NCA oversight), healthcare facilities, and energy sector organizations using Edimax EW-7438RPn routers for network infrastructure. Small and medium enterprises (SMEs) across all sectors are particularly vulnerable due to widespread adoption of budget-friendly Edimax devices. Telecom operators (STC, Mobily, Zain) managing customer networks and ISPs are at elevated risk. The lack of vendor support and public exploit availability increases likelihood of exploitation in Saudi cyberspace.
🏢 Affected Saudi Sectors
Banking and Financial Services (SAMA-regulated)
Government and Public Administration (NCA oversight)
Healthcare and Medical Facilities
Energy and Utilities (ARAMCO, regional operators)
Telecommunications (STC, Mobily, Zain)
Small and Medium Enterprises (SMEs)
Internet Service Providers (ISPs)
Education and Universities
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.9
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Edimax EW-7438RPn devices in your network using network scanning tools (Nmap, Shodan queries for Saudi IP ranges)
2. Isolate affected devices from critical network segments immediately
3. Disable remote management features and restrict access to /goform/formAccept endpoint via firewall rules
4. Change default credentials on all Edimax devices (if not already done)
5. Monitor device logs for suspicious POST requests to /goform/formAccept with submit-url parameters
COMPENSATING CONTROLS (No patch available):
6. Implement network segmentation - place Edimax devices in isolated VLAN with restricted access
7. Deploy WAF/IPS rules to block requests containing 'formAccept' and 'submit-url' parameter manipulation
8. Enable packet inspection for traffic to port 80/443 on these devices
9. Implement strict input validation at network perimeter
10. Consider replacement with patched alternative router models from vendors with active security support
DETECTION RULES:
- Monitor for POST requests to /goform/formAccept with abnormally long submit-url values (>256 characters)
- Alert on any stack overflow patterns in device logs
- Track failed authentication attempts followed by formAccept requests
- Implement SNORT/Suricata rule: alert http any any -> any any (msg:"Edimax EW-7438RPn Buffer Overflow Attempt"; content:"POST"; http_method; content:"/goform/formAccept"; http_uri; content:"submit-url"; http_client_body; sid:1000001;)
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Edimax EW-7438RPn في شبكتك باستخدام أدوات المسح (Nmap، استعلامات Shodan للنطاقات السعودية)
2. عزل الأجهزة المتأثرة عن القطاعات الحرجة في الشبكة فوراً
3. تعطيل ميزات الإدارة البعيدة وتقييد الوصول إلى نقطة /goform/formAccept عبر قواعد جدار الحماية
4. تغيير بيانات الاعتماد الافتراضية على جميع أجهزة Edimax
5. مراقبة سجلات الجهاز للطلبات المريبة إلى /goform/formAccept مع معاملات submit-url
الضوابط البديلة (لا يوجد تصحيح متاح):
6. تطبيق تقسيم الشبكة - ضع أجهزة Edimax في VLAN معزول مع وصول مقيد
7. نشر قواعد WAF/IPS لحجب الطلبات التي تحتوي على معالجة معاملات formAccept و submit-url
8. تفعيل فحص الحزم لحركة المرور إلى المنافذ 80/443 على هذه الأجهزة
9. تطبيق التحقق الصارم من المدخلات على محيط الشبكة
10. النظر في استبدال الأجهزة بنماذج موجهات معدلة من بائعين لديهم دعم أمان نشط
قواعد الكشف:
- مراقبة طلبات POST إلى /goform/formAccept مع قيم submit-url غير عادية (>256 حرف)
- تنبيهات على أنماط تجاوز المكدس في سجلات الجهاز
- تتبع محاولات المصادقة الفاشلة متبوعة بطلبات formAccept
- تطبيق قاعدة SNORT/Suricata
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.8.1 - Asset Management and Inventory Control
ECC 2024 A.8.2 - Information Security Perimeter
ECC 2024 A.12.6 - Management of Technical Vulnerabilities
ECC 2024 A.14.2 - System Development and Change Management
🔵 SAMA CSF
SAMA CSF ID.RA-1 - Asset Management
SAMA CSF PR.DS-6 - Data Security
SAMA CSF DE.CM-1 - Detection Processes
SAMA CSF RS.MI-1 - Incident Response Planning
🟡 ISO 27001:2022
ISO 27001:2022 A.5.19 - Inventory of Information and Other Assets
ISO 27001:2022 A.8.1 - Screening
ISO 27001:2022 A.8.2 - Information Security Responsibilities
ISO 27001:2022 A.12.6 - Management of Technical Vulnerabilities
ISO 27001:2022 A.14.2 - System Development and Change Management
🟣 PCI DSS v4.0.1
PCI DSS 1.1 - Firewall Configuration Standards
PCI DSS 2.1 - Default Security Parameters
PCI DSS 6.2 - Security Patches and Updates
PCI DSS 11.2 - Vulnerability Scanning