📄 Description (English)
A buffer overflow vulnerability in the UPnP AddPortMapping() command in Zyxel VMG4005-B50B firmware versions through 5.13(ABRL.5.4)C0 could allow an adjacent attacker to trigger a temporary denial-of-service (DoS) condition affecting the UPnP function of the affected device.
🤖 AI Executive Summary
A buffer overflow vulnerability in Zyxel VMG4005-B50B gateway devices affects the UPnP AddPortMapping() command, allowing adjacent network attackers to cause denial-of-service conditions. With CVSS 6.5 and no available patch, this poses moderate risk to organizations using these devices in their network infrastructure. The vulnerability requires network adjacency, limiting exposure but affecting critical gateway functions.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Jun 3, 2026 01:48
🇸🇦 Saudi Arabia Impact Assessment
Saudi telecommunications providers (STC, Mobily, Zain) and ISPs using Zyxel VMG4005-B50B as customer premises equipment (CPE) are at risk. Government agencies and enterprises with these devices in network perimeters face potential service disruption. Banking sector organizations using these gateways for branch connectivity could experience temporary network outages. Healthcare facilities relying on these devices for network access may face service interruptions. The impact is primarily availability-focused, affecting UPnP-dependent services and network management capabilities.
🏢 Affected Saudi Sectors
Telecommunications
Internet Service Providers
Government
Banking
Healthcare
Energy
Enterprise Networks
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
6.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Identify all Zyxel VMG4005-B50B devices in your network using asset management tools
2. Disable UPnP functionality on affected devices if not required for operations
3. Implement network segmentation to restrict UPnP traffic to trusted adjacent networks only
4. Monitor for suspicious UPnP AddPortMapping() requests in network logs
Compensating Controls:
5. Deploy firewall rules to block UPnP traffic (UDP 1900, TCP 1900) from untrusted network segments
6. Implement rate limiting on UPnP requests at network boundaries
7. Enable detailed logging of UPnP operations for forensic analysis
8. Restrict physical and logical network access to device management interfaces
Detection Rules:
9. Monitor for repeated failed UPnP AddPortMapping() commands from single source
10. Alert on UPnP traffic from unexpected network segments
11. Track device resets or service interruptions correlated with UPnP activity
12. Check vendor advisories regularly for firmware updates when available
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Zyxel VMG4005-B50B في شبكتك باستخدام أدوات إدارة الأصول
2. تعطيل وظيفة UPnP على الأجهزة المتأثرة إذا لم تكن مطلوبة للعمليات
3. تنفيذ تقسيم الشبكة لتقييد حركة UPnP للشبكات المجاورة الموثوقة فقط
4. مراقبة طلبات UPnP AddPortMapping() المريبة في سجلات الشبكة
الضوابط البديلة:
5. نشر قواعد جدار الحماية لحظر حركة UPnP (UDP 1900، TCP 1900) من قطاعات الشبكة غير الموثوقة
6. تنفيذ تحديد معدل طلبات UPnP على حدود الشبكة
7. تفعيل السجلات التفصيلية لعمليات UPnP للتحليل الجنائي
8. تقييد الوصول المادي والمنطقي لواجهات إدارة الجهاز
قواعد الكشف:
9. مراقبة أوامر UPnP AddPortMapping() الفاشلة المتكررة من مصدر واحد
10. تنبيه حركة UPnP من قطاعات شبكة غير متوقعة
11. تتبع إعادة تعيين الجهاز أو انقطاع الخدمة المرتبط بنشاط UPnP
12. التحقق من استشارات البائع بانتظام للحصول على تحديثات البرامج الثابتة عند توفرها
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Network security controls for gateway devices
ECC 2024 A.5.1.2 - Boundary protection and access control
ECC 2024 A.5.2.1 - Monitoring and logging of network services
ECC 2024 A.5.3.1 - Incident response for availability incidents
🔵 SAMA CSF
SAMA CSF ID.BE-1 - Asset management and inventory
SAMA CSF PR.AC-1 - Access control policies
SAMA CSF PR.PT-1 - Security architecture and design
SAMA CSF DE.CM-1 - Network monitoring and anomaly detection
🟡 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.8.3 - Media handling
ISO 27001:2022 A.13.1 - Network security
🟣 PCI DSS v4.0.1
PCI DSS 1.1 - Firewall configuration standards
PCI DSS 1.3 - Network segmentation
PCI DSS 10.3 - Logging and monitoring