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Vulnerabilities

CVE-2026-5156

High ⚡ Exploit Available
A vulnerability was determined in Tenda CH22 1.0.0.1. This impacts the function formQuickIndex of the file /goform/QuickIndex of the component Parameter Handler. This manipulation of the argument mit_
CWE-119 — Weakness Type
Published: Mar 31, 2026  ·  Modified: Apr 6, 2026  ·  Source: NVD
CVSS v3
8.8
🔗 NVD Official
📄 Description (English)

A vulnerability was determined in Tenda CH22 1.0.0.1. This impacts the function formQuickIndex of the file /goform/QuickIndex of the component Parameter Handler. This manipulation of the argument mit_linktype causes stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been publicly disclosed and may be utilized.

🤖 AI Executive Summary

A critical stack-based buffer overflow vulnerability exists in Tenda CH22 router firmware version 1.0.0.1 affecting the QuickIndex parameter handler. The vulnerability allows remote unauthenticated attackers to execute arbitrary code by manipulating the mit_linktype parameter. With a CVSS score of 8.8 and publicly disclosed exploit code available, this poses an immediate threat to organizations using affected Tenda routers for network access and management.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 23, 2026 16:04
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi organizations across multiple sectors: (1) Banking and Financial Services (SAMA-regulated) — routers used in branch networks and data centers could be compromised, enabling lateral movement to critical systems; (2) Government entities (NCA oversight) — administrative networks relying on Tenda routers for connectivity face remote code execution risks; (3) Telecommunications (STC, Mobily) — infrastructure routers could be weaponized for network-wide attacks; (4) Energy sector (ARAMCO, utilities) — operational technology networks using these routers for management access are at risk; (5) Healthcare institutions — patient data networks could be compromised through router exploitation; (6) SMEs and retail — widespread Tenda router adoption in small business networks creates a large attack surface. The lack of available patches makes this particularly critical for Saudi organizations.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Telecommunications Energy and Utilities Healthcare Retail and E-commerce Small and Medium Enterprises Education
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda CH22 devices running firmware 1.0.0.1 in your network using network scanning tools (nmap, Shodan queries)
2. Isolate affected routers from production networks if possible, or restrict administrative access to trusted networks only
3. Disable remote management features (WAN access to admin interface) immediately
4. Change all default credentials on affected devices
5. Monitor for suspicious connections to port 80/443 and /goform/QuickIndex endpoint

PATCHING GUIDANCE:
1. Check Tenda's official website for firmware updates beyond 1.0.0.1
2. If updates available, schedule maintenance window and apply patches immediately
3. If no patches available, implement network segmentation to isolate routers

COMPENSATING CONTROLS (if patching unavailable):
1. Deploy WAF/IPS rules to block requests to /goform/QuickIndex with suspicious mit_linktype parameters
2. Implement network access controls (ACLs) restricting access to router management interfaces
3. Deploy intrusion detection signatures for stack overflow exploitation attempts
4. Use VPN for all remote administrative access to routers
5. Implement egress filtering to prevent data exfiltration from compromised routers

DETECTION RULES:
1. Monitor HTTP POST requests to /goform/QuickIndex endpoint
2. Alert on mit_linktype parameter values exceeding normal length (>256 bytes)
3. Detect unusual process execution from router processes
4. Monitor for unexpected outbound connections from router IP addresses
5. Track failed authentication attempts followed by successful access
6. Log all administrative access to affected devices with full packet capture
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda CH22 التي تعمل بالإصدار 1.0.0.1 في شبكتك باستخدام أدوات المسح (nmap، استعلامات Shodan)
2. عزل الأجهزة المتأثرة عن شبكات الإنتاج إن أمكن، أو تقييد الوصول الإداري للشبكات الموثوقة فقط
3. تعطيل ميزات الإدارة البعيدة (الوصول عبر WAN إلى واجهة المسؤول) فوراً
4. تغيير جميع بيانات الاعتماد الافتراضية على الأجهزة المتأثرة
5. مراقبة الاتصالات المريبة بالمنفذ 80/443 ونقطة نهاية /goform/QuickIndex

إرشادات التصحيح:
1. تحقق من موقع Tenda الرسمي للحصول على تحديثات البرنامج الثابت بعد 1.0.0.1
2. إذا كانت التحديثات متاحة، جدول نافذة صيانة وطبق التصحيحات فوراً
3. إذا لم تكن التصحيحات متاحة، طبق تقسيم الشبكة لعزل أجهزة التوجيه

الضوابط البديلة (إذا لم يكن التصحيح متاحاً):
1. نشر قواعد WAF/IPS لحجب الطلبات إلى /goform/QuickIndex بمعاملات mit_linktype مريبة
2. تطبيق ضوابط الوصول إلى الشبكة (ACLs) تقيد الوصول إلى واجهات إدارة جهاز التوجيه
3. نشر توقيعات كشف الاختراق لمحاولات استغلال تجاوز المخزن المؤقت
4. استخدام VPN لجميع الوصول الإداري البعيد إلى أجهزة التوجيه
5. تطبيق تصفية الخروج لمنع تسرب البيانات من أجهزة التوجيه المخترقة

قواعد الكشف:
1. مراقبة طلبات HTTP POST إلى نقطة نهاية /goform/QuickIndex
2. تنبيه قيم معامل mit_linktype التي تتجاوز الطول الطبيعي (>256 بايت)
3. كشف تنفيذ العمليات غير المعتادة من عمليات جهاز التوجيه
4. مراقبة الاتصالات الخارجية غير المتوقعة من عناوين IP جهاز التوجيه
5. تتبع محاولات المصادقة الفاشلة متبوعة بالوصول الناجح
6. تسجيل جميع الوصول الإداري إلى الأجهزة المتأثرة مع التقاط الحزم الكامل
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.8.1 - Asset Management and Inventory Control ECC 2024 A.12.6 - Management of Technical Vulnerabilities ECC 2024 A.14.2 - System Development and Change Management ECC 2024 A.5.1 - Policies for Information Security
🔵 SAMA CSF
SAMA CSF ID.RA-1 - Asset Management SAMA CSF PR.IP-12 - Vulnerability Management SAMA CSF DE.CM-8 - Vulnerability Scans SAMA CSF RS.MI-2 - Incident Response and Recovery
🟡 ISO 27001:2022
ISO 27001:2022 A.5.1 - Policies for Information Security ISO 27001:2022 A.8.1 - Asset Management ISO 27001:2022 A.12.6 - Management of Technical Vulnerabilities ISO 27001:2022 A.14.2 - System Development and Change Management
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security Patches and Updates PCI DSS 11.2 - Vulnerability Scanning PCI DSS 1.1 - Firewall Configuration Standards
📦 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
EPSS0.08%
Exploit ✓ Yes
Patch ✗ No
Published 2026-03-31
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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