📄 Description (English)
A flaw has been found in Edimax EW-7438RPn 1.31. This impacts the function formWlSiteSurvey of the file /goform/formWlSiteSurvey of the component webs. This manipulation of the argument selSSID/submit-url causes stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been published and may be used. 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, affecting the web interface's site survey function. The vulnerability allows remote unauthenticated attackers to execute arbitrary code by manipulating the selSSID parameter. With no patch available and the vendor unresponsive, this poses an immediate threat to organizations relying on these devices for network infrastructure.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: May 28, 2026 16:48
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi telecommunications infrastructure (STC, Mobily, Zain), government agencies using these routers for network connectivity, and financial institutions with branch office networks. Banking sector (SAMA-regulated entities) faces elevated risk if these devices are deployed in branch networks or as remote access points. Healthcare facilities and critical infrastructure operators using Edimax equipment for network segmentation are also at risk. The lack of vendor response and available patch creates a prolonged exposure window.
🏢 Affected Saudi Sectors
Telecommunications (STC, Mobily, Zain)
Banking and Financial Services (SAMA-regulated)
Government and Public Administration (NCA oversight)
Healthcare
Energy and Utilities
Retail and E-commerce
Education
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.7
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Edimax EW-7438RPn devices in your network using network scanning tools (nmap, Shodan queries)
2. Isolate affected devices from critical network segments and internet-facing positions
3. Implement network segmentation to restrict access to the web management interface (port 80/443)
4. Monitor for exploitation attempts using IDS/IPS signatures detecting buffer overflow patterns
COMPENSATING CONTROLS:
1. Disable remote management access and restrict web interface to internal networks only
2. Implement firewall rules blocking external access to ports 80/443 on affected devices
3. Deploy WAF rules to detect and block requests with oversized selSSID parameters
4. Enable detailed logging on affected devices and forward logs to SIEM for analysis
DETECTION RULES:
1. Monitor HTTP POST requests to /goform/formWlSiteSurvey with selSSID parameters exceeding 256 bytes
2. Alert on any web interface access attempts from non-whitelisted IP ranges
3. Track firmware version 1.31 devices and flag for replacement planning
LONG-TERM REMEDIATION:
1. Plan replacement of affected devices with vendor-supported alternatives
2. Contact Edimax support for firmware updates or end-of-life guidance
3. Evaluate alternative router solutions with active vendor support
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Edimax EW-7438RPn في الشبكة باستخدام أدوات المسح (nmap، Shodan)
2. عزل الأجهزة المتأثرة عن القطاعات الحرجة والمواضع المواجهة للإنترنت
3. تطبيق تقسيم الشبكة لتقييد الوصول إلى واجهة الإدارة (المنافذ 80/443)
4. مراقبة محاولات الاستغلال باستخدام توقيعات IDS/IPS
الضوابط البديلة:
1. تعطيل الإدارة البعيدة وتقييد واجهة الويب للشبكات الداخلية فقط
2. تطبيق قواعد جدار الحماية لحظر الوصول الخارجي للمنافذ 80/443
3. نشر قواعد WAF للكشف عن طلبات selSSID الكبيرة الحجم
4. تفعيل السجلات التفصيلية وإرسالها إلى SIEM
قواعد الكشف:
1. مراقبة طلبات HTTP POST إلى /goform/formWlSiteSurvey بمعاملات selSSID تتجاوز 256 بايت
2. تنبيهات محاولات الوصول من نطاقات IP غير معتمدة
3. تتبع أجهزة الإصدار 1.31 وتحديدها للاستبدال
العلاج طويل الأجل:
1. التخطيط لاستبدال الأجهزة المتأثرة بخيارات بديلة
2. التواصل مع دعم Edimax للحصول على تحديثات البرامج الثابتة
3. تقييم حلول التوجيه البديلة
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Network security controls for internet-connected devices
ECC 2024 A.5.1.2 - Vulnerability management and patch management
ECC 2024 A.5.2.1 - Access control to network management interfaces
ECC 2024 A.6.1.1 - Incident detection and response capabilities
🔵 SAMA CSF
SAMA CSF ID.AM-2 - Hardware and software asset management
SAMA CSF PR.AC-1 - Access control policy and procedures
SAMA CSF PR.PT-1 - Security awareness and training
SAMA CSF DE.CM-1 - Detection and monitoring of network anomalies
🟡 ISO 27001:2022
ISO 27001:2022 A.5.1 - Policies for information security
ISO 27001:2022 A.8.1 - Asset management
ISO 27001:2022 A.8.2 - Data classification and handling
ISO 27001:2022 A.14.2 - System development and change management
🟣 PCI DSS v4.0.1
PCI DSS 2.4 - Configuration standards for network devices
PCI DSS 6.2 - Security patches and updates
PCI DSS 11.2 - Vulnerability scanning and management