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Vulnerabilities

CVE-2026-5021

High ⚡ Exploit Available
A flaw has been found in Tenda F453 1.0.0.3. This affects the function fromPPTPUserSetting of the file /goform/PPTPUserSetting of the component httpd. This manipulation of the argument delno causes st
CWE-119 — Weakness Type
Published: Mar 29, 2026  ·  Modified: Apr 4, 2026  ·  Source: NVD
CVSS v3
8.8
🔗 NVD Official
📄 Description (English)

A flaw has been found in Tenda F453 1.0.0.3. This affects the function fromPPTPUserSetting of the file /goform/PPTPUserSetting of the component httpd. This manipulation of the argument delno causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been published and may be used.

🤖 AI Executive Summary

A critical stack-based buffer overflow vulnerability exists in Tenda F453 router firmware version 1.0.0.3 affecting the PPTP user settings function. The vulnerability allows unauthenticated remote attackers to execute arbitrary code by manipulating the 'delno' parameter. With a CVSS score of 8.8 and publicly available exploits, this poses an immediate threat to organizations using this router model.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 23, 2026 13:56
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi telecommunications infrastructure (STC, Mobily, Zain), government agencies using Tenda routers for network connectivity, and financial institutions relying on these devices for branch/office connectivity. Banking sector (SAMA-regulated entities) faces elevated risk if F453 routers are deployed in payment processing networks. Healthcare facilities and energy sector organizations (ARAMCO subsidiaries) using this equipment for network segmentation are also at risk. The lack of authentication requirement makes this particularly dangerous for organizations with internet-facing Tenda F453 devices.
🏢 Affected Saudi Sectors
Telecommunications (STC, Mobily, Zain) Banking and Financial Services Government and Public Administration Healthcare Energy and Utilities Retail and E-commerce
⚖️ 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 network scanning tools
2. Isolate affected devices from internet-facing networks immediately
3. Disable PPTP functionality if not required for business operations
4. Implement network segmentation to restrict access to affected routers

PATCHING GUIDANCE:
1. Check Tenda's official website for firmware updates beyond 1.0.0.3
2. If no patch is available, contact Tenda support for security advisory
3. Plan firmware upgrade testing in isolated environment before production deployment

COMPENSATING CONTROLS:
1. Deploy Web Application Firewall (WAF) rules to block requests to /goform/PPTPUserSetting endpoint
2. Implement strict access control lists (ACLs) limiting access to router management interfaces
3. Monitor for suspicious HTTP POST requests with 'delno' parameter manipulation
4. Deploy intrusion detection signatures for buffer overflow attempts
5. Implement network-based rate limiting on router management ports

DETECTION RULES:
1. Monitor for HTTP requests to /goform/PPTPUserSetting with abnormally long 'delno' parameter values
2. Alert on any remote access attempts to router management interfaces from untrusted sources
3. Track failed authentication attempts to router web interface
4. Monitor for unexpected process execution or system crashes on affected routers
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda F453 التي تعمل بالإصدار 1.0.0.3 في شبكتك باستخدام أدوات المسح
2. عزل الأجهزة المتأثرة عن الشبكات المتصلة بالإنترنت فوراً
3. تعطيل وظيفة PPTP إذا لم تكن مطلوبة للعمليات التجارية
4. تطبيق تقسيم الشبكة لتقييد الوصول إلى أجهزة التوجيه المتأثرة

إرشادات التصحيح:
1. التحقق من موقع Tenda الرسمي للحصول على تحديثات البرامج الثابتة
2. التواصل مع دعم Tenda للحصول على استشارة أمان إذا لم يكن هناك تصحيح
3. التخطيط لاختبار ترقية البرامج الثابتة في بيئة معزولة

الضوابط البديلة:
1. نشر قواعد جدار حماية تطبيقات الويب لحجب الطلبات إلى نقطة نهاية PPTPUserSetting
2. تطبيق قوائم التحكم في الوصول الصارمة لتقييد الوصول إلى واجهات إدارة التوجيه
3. مراقبة طلبات HTTP المريبة مع التلاعب بمعامل 'delno'
4. نشر توقيعات كشف الاختراق لمحاولات تجاوز المخزن المؤقت
5. تطبيق تحديد معدل قائم على الشبكة على منافذ إدارة التوجيه

قواعد الكشف:
1. مراقبة طلبات HTTP إلى /goform/PPTPUserSetting بقيم معامل 'delno' طويلة بشكل غير طبيعي
2. التنبيه على محاولات الوصول البعيد إلى واجهات إدارة التوجيه من مصادر غير موثوقة
3. تتبع محاولات المصادقة الفاشلة على واجهة الويب للتوجيه
4. مراقبة تنفيذ العمليات غير المتوقعة أو أعطال النظام على أجهزة التوجيه المتأثرة
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.12.6.1 - Management of technical vulnerabilities ECC 2024 A.14.2.1 - Secure development policy ECC 2024 A.12.3.1 - Configuration management
🔵 SAMA CSF
ID.RA-1 - Asset management and vulnerability identification PR.IP-12 - Security patches and updates DE.CM-8 - Vulnerability scanning and management
🟡 ISO 27001:2022
A.12.6.1 - Management of technical vulnerabilities A.14.2.1 - Secure development and change management A.12.3.1 - Configuration management A.12.2.1 - Change management procedures
🟣 PCI DSS v4.0.1
Requirement 6.2 - Security patches and updates Requirement 11.2 - Vulnerability scanning
📦 Affected Products / CPE 1 entries
tenda:f453_firmware:1.0.0.3
📊 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
EPSS0.08%
Exploit ✓ Yes
Patch ✗ No
Published 2026-03-29
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
8.9
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
exploit-available CWE-119
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