📄 Description (English)
A weakness has been identified in Tenda A21 1.0.0.0. This affects the function fromSetIpMacBind of the file /goform/SetIpMacBind. This manipulation of the argument list causes stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.
🤖 AI Executive Summary
A critical stack-based buffer overflow vulnerability exists in Tenda A21 router firmware version 1.0.0.0 affecting the IP-MAC binding function. With a CVSS score of 8.8 and publicly available exploits, this vulnerability allows remote attackers to execute arbitrary code or cause denial of service. Immediate patching is essential as Tenda routers are widely deployed across Saudi organizations for network connectivity.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 22, 2026 22:56
🇸🇦 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 commonly deployed in SMEs, retail banking branches, and government offices across Saudi Arabia. Successful exploitation could lead to network compromise, lateral movement to internal systems, data exfiltration, and disruption of critical services. Telecom operators (STC, Mobily) and energy sector organizations using these devices face elevated risk of network-wide compromise.
🏢 Affected Saudi Sectors
Banking and Financial Services
Government and Public Administration
Telecommunications
Energy and Utilities
Healthcare
Retail and E-commerce
Small and Medium Enterprises
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.9
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda A21 devices running firmware 1.0.0.0 in your network using network scanning tools
2. Isolate affected devices from critical network segments if patching cannot be completed immediately
3. Implement network segmentation to restrict access to the /goform/SetIpMacBind endpoint
4. Monitor for exploitation attempts using IDS/IPS signatures
PATCHING:
1. Download the latest firmware from Tenda's official support portal
2. Verify firmware integrity using provided checksums
3. Apply patches during maintenance windows with documented rollback procedures
4. Test patches in non-production environment first
COMPENSATING CONTROLS (if immediate patching not possible):
1. Disable remote management access to router web interface
2. Restrict access to router management ports (80, 443) via firewall rules
3. Implement IP whitelisting for administrative access
4. Deploy WAF rules to block malformed SetIpMacBind requests
DETECTION:
1. Monitor for HTTP POST requests to /goform/SetIpMacBind with oversized parameters
2. Alert on unexpected process execution from router processes
3. Track firmware version changes across network inventory
4. Monitor for unusual network traffic patterns from affected devices
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda A21 التي تعمل بالإصدار 1.0.0.0 في شبكتك باستخدام أدوات المسح
2. عزل الأجهزة المتأثرة عن أجزاء الشبكة الحرجة إذا لم يكن التصحيح ممكنًا فورًا
3. تنفيذ تقسيم الشبكة لتقييد الوصول إلى نقطة نهاية /goform/SetIpMacBind
4. مراقبة محاولات الاستغلال باستخدام توقيعات IDS/IPS
التصحيح:
1. تحميل أحدث برنامج تثبيت من بوابة دعم Tenda الرسمية
2. التحقق من سلامة البرنامج باستخدام المجاميع المرجعية المتوفرة
3. تطبيق التصحيحات خلال نوافذ الصيانة مع إجراءات التراجع الموثقة
4. اختبار التصحيحات في بيئة غير الإنتاج أولاً
الضوابط البديلة:
1. تعطيل الوصول الإداري البعيد إلى واجهة الويب للجهاز
2. تقييد الوصول إلى منافذ إدارة الجهاز عبر قواعد جدار الحماية
3. تنفيذ قائمة بيضاء IP للوصول الإداري
4. نشر قواعد WAF لحظر طلبات SetIpMacBind المشوهة
الكشف:
1. مراقبة طلبات HTTP POST إلى /goform/SetIpMacBind بمعاملات كبيرة الحجم
2. التنبيه على تنفيذ العمليات غير المتوقعة من عمليات الجهاز
3. تتبع تغييرات إصدار البرنامج عبر جرد الشبكة
4. مراقبة أنماط حركة الشبكة غير العادية من الأجهزة 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 - System and information integrity
DE.CM-8 - Vulnerability scans
🟡 ISO 27001:2022
A.12.6.1 - Management of technical vulnerabilities
A.14.2.1 - Secure development policy
A.12.3.1 - Configuration management
A.12.2.1 - Change management
🟣 PCI DSS v4.0.1
Requirement 6.2 - Security patches and updates
Requirement 11.2 - Vulnerability scanning
🔗 References & Sources 6
🔗
https://github.com/QIU-DIE/cve-nneeww/issues/2
cna@vuldb.com
Exploit
Issue Tracking
Mitigation
Third Party Advisory
🔗
https://vuldb.com/?ctiid.347108
cna@vuldb.com
Permissions Required
VDB Entry
🔗
https://vuldb.com/?id.347108
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://vuldb.com/?submit.754630
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://vuldb.com/?submit.754631
cna@vuldb.com
VDB Entry
Third Party Advisory
🔗
https://www.tenda.com.cn/
cna@vuldb.com
Product
📦 Affected Products / CPE 1 entries
tenda:a21_firmware:1.0.0.0