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Vulnerabilities

CVE-2026-6136

High
CWE-119 — Weakness Type
Published: Apr 13, 2026  ·  Modified: Apr 19, 2026  ·  Source: NVD
CVSS v3
8.8
🔗 NVD Official
📄 Description (English)

A security vulnerability has been detected in Tenda F451 1.0.0.7_cn_svn7958. Impacted is the function frmL7ImForm of the file /goform/L7Im. The manipulation of the argument page leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used.

🤖 AI Executive Summary

A critical stack-based buffer overflow vulnerability exists in Tenda F451 router firmware (version 1.0.0.7_cn_svn7958) affecting the L7Im form handler. The vulnerability allows remote attackers to execute arbitrary code by manipulating the 'page' parameter, with no patch currently available. This poses significant risk to Saudi organizations relying on Tenda routers for network infrastructure.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 22, 2026 20:42
🇸🇦 Saudi Arabia Impact Assessment
High impact on Saudi telecommunications sector (STC, Mobily, Zain) and government agencies using Tenda routers for network infrastructure. Banking sector (SAMA-regulated institutions) at risk if routers used in branch networks or remote access infrastructure. Healthcare organizations and critical infrastructure operators using Tenda equipment for network segmentation face potential compromise. Small to medium enterprises across all sectors in Saudi Arabia commonly deploy Tenda F451 routers, making this a widespread vulnerability.
🏢 Affected Saudi Sectors
Telecommunications (STC, Mobily, Zain) Banking and Financial Services Government and Public Administration Healthcare Energy and Utilities Small and Medium Enterprises Retail and E-commerce
⚖️ Saudi Risk Score (AI)
8.5
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda F451 devices in your network using network scanning tools (nmap, Shodan queries for Tenda devices)
2. Isolate affected routers from critical network segments if possible
3. Implement network-level access controls to restrict access to /goform/L7Im endpoint
4. Monitor for exploitation attempts using IDS/IPS signatures

PATCHING GUIDANCE:
1. Check Tenda's official support portal for firmware updates beyond 1.0.0.7_cn_svn7958
2. If no patch available, plan device replacement with alternative vendors (Cisco, Fortinet, Huawei)
3. Contact Tenda support directly for security advisory and timeline

COMPENSATING CONTROLS:
1. Disable remote management features on affected routers
2. Implement strict firewall rules blocking external access to router management interfaces
3. Deploy Web Application Firewall (WAF) rules to filter malicious 'page' parameter values
4. Segment router management traffic to isolated VLAN
5. Enable router logging and forward logs to SIEM for analysis

DETECTION RULES:
1. Monitor HTTP POST requests to /goform/L7Im with oversized 'page' parameters
2. Alert on any access to /goform/L7Im from external IP addresses
3. Track firmware version of all Tenda devices and flag version 1.0.0.7_cn_svn7958
4. Monitor for unusual process execution on router (SSH, telnet access attempts)
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda F451 في شبكتك باستخدام أدوات المسح (nmap، استعلامات Shodan)
2. عزل الأجهزة المتأثرة عن قطاعات الشبكة الحرجة إن أمكن
3. تطبيق ضوابط الوصول على مستوى الشبكة لتقييد الوصول إلى نقطة نهاية /goform/L7Im
4. مراقبة محاولات الاستغلال باستخدام توقيعات IDS/IPS

إرشادات التصحيح:
1. التحقق من بوابة دعم Tenda الرسمية للتحديثات بعد الإصدار 1.0.0.7_cn_svn7958
2. إذا لم يكن هناك تصحيح متاح، خطط لاستبدال الجهاز بموردين بدلاء
3. التواصل مع دعم Tenda مباشرة للحصول على استشارة أمنية والجدول الزمني

الضوابط البديلة:
1. تعطيل ميزات الإدارة البعيدة على الأجهزة المتأثرة
2. تطبيق قواعد جدار الحماية الصارمة لحظر الوصول الخارجي إلى واجهات إدارة الموجه
3. نشر قواعد جدار تطبيقات الويب لتصفية قيم معامل 'page' الضارة
4. عزل حركة إدارة الموجه إلى VLAN معزول
5. تفعيل تسجيل الموجه وإعادة توجيه السجلات إلى SIEM

قواعد الكشف:
1. مراقبة طلبات HTTP POST إلى /goform/L7Im بمعاملات 'page' كبيرة الحجم
2. التنبيه على أي وصول إلى /goform/L7Im من عناوين IP خارجية
3. تتبع إصدار البرنامج الثابت لجميع أجهزة Tenda والإشارة إلى الإصدار 1.0.0.7_cn_svn7958
4. مراقبة تنفيذ العمليات غير العادية على الموجه
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information security policies and procedures A.8.1.1 - User access management A.12.2.1 - Change management procedures A.12.6.1 - Management of technical vulnerabilities
🔵 SAMA CSF
ID.RA-1 - Asset management and inventory PR.DS-6 - Integrity checking mechanisms PR.IP-1 - System development and change management DE.CM-8 - Vulnerability scans
🟡 ISO 27001:2022
A.12.6.1 - Management of technical vulnerabilities A.14.2.1 - Secure development policy A.12.2.1 - Change management A.13.1.3 - Segregation of networks
🟣 PCI DSS v4.0.1
Requirement 6.2 - Security patches and updates Requirement 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
EPSS0.05%
Exploit No
Patch ✗ No
Published 2026-04-13
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
8.5
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
CWE-119
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