📄 Description (English)
A security vulnerability has been detected in Tenda HG9 300001138. Affected by this issue is some unknown functionality of the file /boaform/formLoopBack of the component Loopback Detection Configuration Endpoint. Such manipulation of the argument Ethtype leads to stack-based buffer overflow. The attack can be executed remotely. The exploit has been disclosed publicly and may be used.
🤖 AI Executive Summary
A critical stack-based buffer overflow vulnerability (CVE-2026-2908) exists in Tenda HG9 router firmware version 300001138, affecting the Loopback Detection Configuration endpoint. With a CVSS score of 8.8 and publicly disclosed exploit code, this vulnerability allows remote attackers to execute arbitrary code without authentication. Immediate patching is essential for all organizations using affected Tenda HG9 devices, particularly those in Saudi Arabia's critical infrastructure sectors.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 23, 2026 01:07
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi organizations, particularly: (1) Telecom sector (STC, Mobily, Zain) — Tenda routers commonly used in enterprise and residential networks; (2) Banking and financial institutions — potential lateral movement vector into secure networks; (3) Government agencies and NCA-regulated entities — compromise of network perimeter devices; (4) Healthcare facilities — disruption of critical patient care systems; (5) Energy sector including ARAMCO facilities — potential access to operational technology networks. The public exploit availability and remote attack vector without authentication make this an immediate threat to Saudi critical infrastructure.
🏢 Affected Saudi Sectors
Telecommunications (STC, Mobily, Zain)
Banking and Financial Services
Government and Public Administration
Healthcare
Energy and Utilities (ARAMCO)
Critical Infrastructure
Education
Retail and E-commerce
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda HG9 devices running firmware version 300001138 in your network using network scanning tools
2. Isolate affected devices from critical network segments if immediate patching is not possible
3. Implement network-level access controls to restrict access to the /boaform/formLoopBack endpoint
4. Monitor for suspicious connections to port 80/443 on Tenda devices
PATCHING GUIDANCE:
1. Contact Tenda support immediately to obtain the latest firmware version (post-300001138)
2. Schedule maintenance windows for firmware updates on all affected devices
3. Perform firmware updates in batches to maintain network availability
4. Verify successful updates by checking firmware version post-update
COMPENSATING CONTROLS (if patch unavailable):
1. Implement WAF rules to block requests to /boaform/formLoopBack endpoint
2. Restrict administrative access to Tenda devices to specific IP ranges
3. Disable remote management features if not required
4. Place Tenda devices behind additional firewall with strict egress filtering
DETECTION RULES:
1. Monitor for HTTP POST requests to /boaform/formLoopBack with abnormal Ethtype parameter values
2. Alert on stack-based buffer overflow patterns in network traffic
3. Monitor for unexpected process execution or system crashes on Tenda devices
4. Track failed authentication attempts followed by successful exploitation indicators
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda HG9 التي تعمل بإصدار البرنامج الثابت 300001138 في شبكتك باستخدام أدوات المسح
2. عزل الأجهزة المتأثرة عن القطاعات الحرجة في الشبكة إذا لم يكن التصحيح الفوري ممكنًا
3. تطبيق عناصر التحكم في الوصول على مستوى الشبكة لتقييد الوصول إلى نقطة النهاية /boaform/formLoopBack
4. مراقبة الاتصالات المريبة بالمنافذ 80/443 على أجهزة Tenda
إرشادات التصحيح:
1. الاتصال بدعم Tenda فورًا للحصول على أحدث إصدار برنامج ثابت
2. جدولة نوافذ الصيانة لتحديثات البرنامج الثابت على جميع الأجهزة المتأثرة
3. إجراء تحديثات البرنامج الثابت على دفعات للحفاظ على توفر الشبكة
4. التحقق من نجاح التحديثات بفحص إصدار البرنامج الثابت بعد التحديث
عناصر التحكم البديلة:
1. تطبيق قواعد جدار الحماية لحجب الطلبات إلى نقطة النهاية /boaform/formLoopBack
2. تقييد الوصول الإداري إلى أجهزة Tenda على نطاقات IP محددة
3. تعطيل ميزات الإدارة البعيدة إذا لم تكن مطلوبة
4. وضع أجهزة Tenda خلف جدار حماية إضافي مع تصفية الخروج الصارمة
قواعد الكشف:
1. مراقبة طلبات HTTP POST إلى /boaform/formLoopBack بقيم معاملات Ethtype غير عادية
2. التنبيه على أنماط تجاوز المخزن المؤقت المستند إلى المكدس في حركة المرور
3. مراقبة تنفيذ العمليات غير المتوقعة أو أعطال النظام على أجهزة Tenda
4. تتبع محاولات المصادقة الفاشلة متبوعة بمؤشرات الاستغلال الناجح
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.8.1 - Asset Management and Inventory Control
ECC 2024 A.12.6 - Change Management
ECC 2024 A.14.2 - System Development and Maintenance
ECC 2024 A.12.2 - Access Control and Authentication
🔵 SAMA CSF
SAMA CSF ID.BE-1 - Business Environment
SAMA CSF PR.DS-6 - Data Security
SAMA CSF PR.IP-1 - Security Policy and Process
SAMA CSF DE.CM-1 - Detection Processes
🟡 ISO 27001:2022
ISO 27001:2022 A.5.23 - Information Security for Supplier Relationships
ISO 27001:2022 A.8.1 - Asset Management
ISO 27001:2022 A.12.6 - Change Management
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
🔗 References & Sources 5
🔗
https://github.com/QIU-DIE/cve-nneeww/issues/10
cna@vuldb.com
Exploit
Issue Tracking
Mitigation
Third Party Advisory
🔗
https://vuldb.com/?ctiid.347217
cna@vuldb.com
Permissions Required
VDB Entry
🔗
https://vuldb.com/?id.347217
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://vuldb.com/?submit.755202
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://www.tenda.com.cn/
cna@vuldb.com
Product
📦 Affected Products / CPE 1 entries
tenda:hg9_firmware:300001138