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Vulnerabilities

CVE-2026-4566

High
A flaw has been found in Belkin F9K1122 1.00.33. The affected element is the function formWISP5G of the file /goform/formWISP5G. Executing a manipulation of the argument webpage can lead to stack-base
CWE-119 — Weakness Type
Published: Mar 23, 2026  ·  Modified: Mar 29, 2026  ·  Source: NVD
CVSS v3
8.8
🔗 NVD Official
📄 Description (English)

A flaw has been found in Belkin F9K1122 1.00.33. The affected element is the function formWISP5G of the file /goform/formWISP5G. Executing a manipulation of the argument webpage can lead to stack-based buffer overflow. The attack can be launched 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 Belkin F9K1122 wireless router firmware version 1.00.33, affecting the formWISP5G function. The vulnerability allows remote attackers to execute arbitrary code by manipulating the 'webpage' parameter without authentication. With no patch available and the vendor unresponsive, this poses an immediate threat to organizations relying on this router model for network infrastructure.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 23, 2026 11:50
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi organizations across multiple sectors: Banking and financial institutions using Belkin routers for branch connectivity face potential network compromise and data exfiltration. Government agencies and NCA-regulated entities risk unauthorized access to sensitive networks. Telecommunications providers (STC, Mobily) and ISPs may experience service disruption. Healthcare facilities relying on these routers for medical device connectivity face patient data exposure. Energy sector organizations (ARAMCO, utilities) could experience operational technology network compromise. Small and medium enterprises throughout Saudi Arabia using this router model are particularly vulnerable due to limited security monitoring capabilities.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Telecommunications Healthcare Energy and Utilities Small and Medium Enterprises Retail
⚖️ Saudi Risk Score (AI)
8.9
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Belkin F9K1122 devices running firmware 1.00.33 in your network using network scanning tools
2. Isolate affected routers from critical network segments if possible
3. Implement network segmentation to limit lateral movement from compromised routers
4. Enable enhanced logging and monitoring on affected devices

PATCHING GUIDANCE:
1. Check Belkin support portal for firmware updates beyond 1.00.33
2. If no official patch is available, consider replacing the device with a supported alternative
3. Do not delay replacement as vendor is unresponsive

COMPENSATING CONTROLS:
1. Restrict administrative access to router management interfaces using firewall rules
2. Disable remote management features if not required
3. Implement strict access controls limiting which systems can communicate with router management ports
4. Deploy intrusion detection/prevention systems (IDS/IPS) to monitor for exploitation attempts
5. Monitor for suspicious traffic patterns on port 80/443 to the affected routers

DETECTION RULES:
1. Alert on POST requests to /goform/formWISP5G with unusual 'webpage' parameter values
2. Monitor for stack overflow indicators: abnormally long parameter strings, null bytes in parameters
3. Track failed authentication attempts followed by direct function calls
4. Monitor for unexpected process execution or privilege escalation from router processes
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Belkin F9K1122 التي تعمل بالإصدار 1.00.33 في شبكتك باستخدام أدوات المسح
2. عزل الأجهزة المتأثرة عن أجزاء الشبكة الحرجة إن أمكن
3. تطبيق تقسيم الشبكة لتحديد الحركة الجانبية من أجهزة التوجيه المخترقة
4. تفعيل السجلات المحسنة والمراقبة على الأجهزة المتأثرة

إرشادات التصحيح:
1. التحقق من بوابة دعم Belkin للحصول على تحديثات البرامج الثابتة بعد الإصدار 1.00.33
2. إذا لم يكن هناك تصحيح رسمي متاح، فكر في استبدال الجهاز ببديل مدعوم
3. عدم التأخير في الاستبدال لأن البائع غير مستجيب

الضوابط البديلة:
1. تقييد الوصول الإداري إلى واجهات إدارة التوجيه باستخدام قواعد جدار الحماية
2. تعطيل ميزات الإدارة البعيدة إذا لم تكن مطلوبة
3. تطبيق ضوابط وصول صارمة تحد من الأنظمة التي يمكنها التواصل مع منافذ إدارة التوجيه
4. نشر أنظمة كشف/منع الاختراق لمراقبة محاولات الاستغلال
5. مراقبة أنماط حركة المرور المريبة على المنافذ 80/443 للأجهزة المتأثرة

قواعد الكشف:
1. تنبيه طلبات POST إلى /goform/formWISP5G بقيم معاملات 'webpage' غير عادية
2. مراقبة مؤشرات تجاوز المكدس: سلاسل معاملات طويلة بشكل غير طبيعي، بايتات فارغة في المعاملات
3. تتبع محاولات المصادقة الفاشلة متبوعة باستدعاءات وظائف مباشرة
4. مراقبة تنفيذ العمليات غير المتوقعة أو تصعيد الامتيازات من عمليات التوجيه
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.8.1 - Asset Management and Inventory Control ECC 2024 A.12.6 - Management of Technical Vulnerabilities ECC 2024 A.14.2 - System Development and Maintenance ECC 2024 A.5.1 - Policies for Information Security
🔵 SAMA CSF
SAMA CSF ID.RA-1 - Asset Management SAMA CSF PR.IP-12 - Vulnerability Management SAMA CSF DE.CM-8 - Vulnerability Scans SAMA CSF RS.RP-1 - Response Planning
🟡 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.12.6 - Management of Technical Vulnerabilities ISO 27001:2022 A.14.2 - System Development and Maintenance
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security Patches and Updates PCI DSS 11.2 - Vulnerability Scanning
📊 CVSS Score
8.8
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredL — Low / Local
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityH — High
IntegrityH — High
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score8.8
CWECWE-119
Exploit No
Patch ✗ No
Published 2026-03-23
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
8.9
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
CWE-119
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