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Vulnerabilities

CVE-2026-5155

High ⚡ Exploit Available
A vulnerability was found in Tenda CH22 1.0.0.1. This affects the function fromAdvSetWan of the file /goform/AdvSetWan of the component Parameter Handler. The manipulation of the argument wanmode resu
CWE-119 — Weakness Type
Published: Mar 30, 2026  ·  Modified: Apr 6, 2026  ·  Source: NVD
CVSS v3
8.8
🔗 NVD Official
📄 Description (English)

A vulnerability was found in Tenda CH22 1.0.0.1. This affects the function fromAdvSetWan of the file /goform/AdvSetWan of the component Parameter Handler. The manipulation of the argument wanmode results in stack-based buffer overflow. The attack can be executed remotely. The exploit has been made public and could be used.

🤖 AI Executive Summary

A critical stack-based buffer overflow vulnerability exists in Tenda CH22 router firmware (v1.0.0.1) affecting the /goform/AdvSetWan parameter handler. The vulnerability allows remote attackers to execute arbitrary code by manipulating the wanmode argument, with public exploits already available. This poses immediate risk to Saudi organizations using this router model for network infrastructure.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 23, 2026 16:03
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability directly impacts Saudi telecommunications infrastructure (STC, Mobily, Zain), government agencies (NCA, CITC), banking sector network perimeters, and enterprise organizations using Tenda CH22 routers for WAN connectivity. The remote code execution capability enables attackers to establish persistent access, intercept communications, and pivot into internal networks. Critical impact for ARAMCO and energy sector facilities relying on these devices for network segmentation.
🏢 Affected Saudi Sectors
Telecommunications (STC, Mobily, Zain) Government (NCA, CITC, Ministry of Interior) Banking and Financial Services Energy and Utilities (ARAMCO, SEC) Healthcare Enterprise/Corporate Networks
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda CH22 devices in your network using asset discovery tools
2. Isolate affected devices from production networks or restrict WAN access via firewall rules
3. Disable remote management features on the router web interface
4. Change default credentials immediately (admin/admin)
5. Monitor for exploitation attempts using IDS/IPS signatures

PATCHING GUIDANCE:
- No official patch available; contact Tenda for firmware updates
- Check Tenda support portal regularly for security updates
- Consider firmware alternatives if available

COMPENSATING CONTROLS:
1. Implement network segmentation: place router in DMZ with strict ACLs
2. Deploy WAF/IPS rules blocking POST requests to /goform/AdvSetWan with suspicious wanmode parameters
3. Enable router access logs and forward to SIEM for analysis
4. Implement rate limiting on /goform endpoints
5. Use VPN for remote administration instead of direct web access

DETECTION RULES:
- Monitor HTTP POST requests to /goform/AdvSetWan with wanmode parameter containing special characters or excessive length (>256 bytes)
- Alert on multiple failed authentication attempts to router management interface
- Track unusual process execution on router (if accessible via SSH)
- Monitor for unexpected outbound connections from router IP addresses
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda CH22 في شبكتك باستخدام أدوات اكتشاف الأصول
2. عزل الأجهزة المتأثرة عن شبكات الإنتاج أو تقييد الوصول إلى WAN عبر قواعد جدار الحماية
3. تعطيل ميزات الإدارة البعيدة على واجهة الويب للموجه
4. تغيير بيانات الاعتماد الافتراضية فوراً (admin/admin)
5. مراقبة محاولات الاستغلال باستخدام توقيعات IDS/IPS

إرشادات التصحيح:
- لا يوجد تصحيح رسمي متاح؛ اتصل بـ Tenda للحصول على تحديثات البرامج الثابتة
- تحقق من بوابة دعم Tenda بانتظام للحصول على تحديثات الأمان
- فكر في بدائل البرامج الثابتة إن أمكن

الضوابط البديلة:
1. تنفيذ تقسيم الشبكة: ضع الموجه في DMZ مع قوائم تحكم الوصول الصارمة
2. نشر قواعد WAF/IPS تحظر طلبات POST إلى /goform/AdvSetWan بمعاملات wanmode مريبة
3. تفعيل سجلات وصول الموجه وإعادة توجيهها إلى SIEM
4. تنفيذ تحديد معدل على نقاط نهاية /goform
5. استخدام VPN للإدارة البعيدة بدلاً من الوصول المباشر إلى الويب

قواعد الكشف:
- مراقبة طلبات HTTP POST إلى /goform/AdvSetWan بمعامل wanmode يحتوي على أحرف خاصة أو طول مفرط (>256 بايت)
- تنبيه محاولات المصادقة الفاشلة المتعددة لواجهة إدارة الموجه
- تتبع تنفيذ العمليات غير المتوقعة على الموجه
- مراقبة الاتصالات الصادرة غير المتوقعة من عناوين IP للموجه
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.8.1 - Asset Management and Inventory ECC 2024 A.12.6 - Change Management ECC 2024 A.14.2 - System Development and Maintenance ECC 2024 A.5.2 - Information Security Policies
🔵 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.5.23 - Information Security for Supplier Relationships ISO 27001:2022 A.8.1 - Asset Management ISO 27001:2022 A.8.2 - Configuration Management ISO 27001:2022 A.12.6 - Change Management
🟣 PCI DSS v4.0.1
PCI DSS 1.1 - Firewall Configuration Standards PCI DSS 2.1 - Default Security Parameters PCI DSS 6.2 - Security Patches and Updates
📦 Affected Products / CPE 1 entries
tenda:ch22_firmware:1.0.0.1
📊 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
EPSS0.03%
Exploit ✓ Yes
Patch ✗ No
Published 2026-03-30
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
9.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
exploit-available CWE-119
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