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Vulnerabilities

CVE-2026-5605

High
CWE-119 — Weakness Type
Published: Apr 6, 2026  ·  Modified: Apr 13, 2026  ·  Source: NVD
CVSS v3
8.8
🔗 NVD Official
📄 Description (English)

A weakness has been identified in Tenda CH22 1.0.0.1. This affects the function formWrlExtraSet of the file /goform/WrlExtraSet. Executing a manipulation of the argument GO can lead to stack-based buffer overflow. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks.

🤖 AI Executive Summary

CVE-2026-5605 is a critical stack-based buffer overflow vulnerability in Tenda CH22 router firmware (version 1.0.0.1) affecting the WrlExtraSet function. The vulnerability allows remote attackers to execute arbitrary code by manipulating the GO parameter, with public exploit availability increasing immediate risk. No patch is currently available, requiring urgent mitigation measures for affected organizations.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 23, 2026 18:08
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi organizations relying on Tenda CH22 routers for network infrastructure. Primary impact sectors include: Banking and Financial Services (SAMA-regulated institutions using these routers for branch connectivity), Government agencies (NCA oversight), Telecommunications providers (STC, Mobily, Zain), Healthcare facilities, and Energy sector (ARAMCO subsidiaries). The remote code execution capability enables complete network compromise, data exfiltration, and lateral movement into critical systems. Small to medium enterprises and government offices commonly deploy Tenda equipment, making this a widespread threat across Saudi infrastructure.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Telecommunications Healthcare Energy and Utilities Education Retail and E-commerce Small and Medium Enterprises
⚖️ Saudi Risk Score (AI)
8.9
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda CH22 devices in your network using asset discovery tools and network scanning
2. Isolate affected devices from critical networks or implement network segmentation to limit exposure
3. Disable remote management features on Tenda CH22 routers immediately
4. Implement firewall rules to block external access to port 80/443 on affected devices
5. Monitor for suspicious access patterns to /goform/WrlExtraSet endpoint

PATCHING GUIDANCE:
1. Contact Tenda support for firmware updates (check vendor advisories regularly)
2. If no patch available within 30 days, plan device replacement with alternative vendors
3. Maintain inventory of affected devices for future patch deployment

COMPENSATING CONTROLS:
1. Deploy Web Application Firewall (WAF) rules to block requests with suspicious GO parameter values
2. Implement network-based intrusion detection signatures for buffer overflow attempts
3. Restrict administrative access to router management interfaces via VPN only
4. Enable detailed logging on affected devices and forward logs to SIEM
5. Implement network segmentation to isolate router management traffic

DETECTION RULES:
1. Monitor HTTP POST requests to /goform/WrlExtraSet with oversized GO parameters (>256 bytes)
2. Alert on any remote access attempts to router management interfaces from external IPs
3. Track failed authentication attempts on router admin panels
4. Monitor for unexpected process execution or system calls from router processes
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda CH22 في شبكتك باستخدام أدوات اكتشاف الأصول والمسح الشبكي
2. عزل الأجهزة المتأثرة عن الشبكات الحرجة أو تطبيق تقسيم الشبكة لتحديد التعرض
3. تعطيل ميزات الإدارة البعيدة على أجهزة Tenda CH22 فوراً
4. تطبيق قواعد جدار الحماية لحظر الوصول الخارجي إلى المنافذ 80/443 على الأجهزة المتأثرة
5. مراقبة أنماط الوصول المريبة إلى نقطة نهاية /goform/WrlExtraSet

إرشادات التصحيح:
1. الاتصال بدعم Tenda للحصول على تحديثات البرامج الثابتة (تحقق من إشعارات البائع بانتظام)
2. إذا لم يتوفر تصحيح خلال 30 يوماً، خطط لاستبدال الجهاز ببدائل من بائعين آخرين
3. الحفاظ على جرد الأجهزة المتأثرة لنشر التصحيح المستقبلي

الضوابط التعويضية:
1. نشر قواعد جدار تطبيقات الويب (WAF) لحظر الطلبات ذات قيم معاملات GO المريبة
2. تطبيق توقيعات الكشف عن الاختراق المستندة إلى الشبكة لمحاولات تجاوز المخزن المؤقت
3. تقييد الوصول الإداري إلى واجهات إدارة جهاز التوجيه عبر VPN فقط
4. تفعيل السجلات التفصيلية على الأجهزة المتأثرة وإعادة توجيه السجلات إلى SIEM
5. تطبيق تقسيم الشبكة لعزل حركة مرور إدارة جهاز التوجيه

قواعد الكشف:
1. مراقبة طلبات HTTP POST إلى /goform/WrlExtraSet بمعاملات GO كبيرة الحجم (>256 بايت)
2. التنبيه على أي محاولات وصول بعيدة إلى واجهات إدارة جهاز التوجيه من عناوين IP خارجية
3. تتبع محاولات المصادقة الفاشلة على لوحات إدارة جهاز التوجيه
4. مراقبة تنفيذ العمليات غير المتوقعة أو استدعاءات النظام من عمليات جهاز التوجيه
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Network security controls for internet-facing devices ECC 2024 A.6.2.1 - Vulnerability management and patch deployment ECC 2024 A.8.2.3 - Monitoring and detection of unauthorized access attempts ECC 2024 A.12.6.1 - Management of technical vulnerabilities
🔵 SAMA CSF
SAMA CSF ID.RA-1 - Asset management and inventory SAMA CSF PR.PT-1 - Boundary protection and network segmentation SAMA CSF DE.CM-1 - Detection and monitoring of anomalous activity SAMA CSF RS.MI-1 - Incident response and containment
🟡 ISO 27001:2022
ISO 27001:2022 A.5.1.1 - Policies for information security ISO 27001:2022 A.8.1.1 - Screening and vetting of personnel ISO 27001:2022 A.8.2.3 - Segregation of duties ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities ISO 27001:2022 A.14.2.1 - Secure development policy
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Ensure security patches are installed within defined timeframe PCI DSS 11.2 - Run automated vulnerability scans regularly PCI DSS 1.1 - Firewall configuration standards
📊 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
EPSS0.02%
Exploit No
Patch ✗ No
Published 2026-04-06
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
8.9
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
CWE-119
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