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Vulnerabilities

CVE-2026-2874

High ⚡ Exploit Available
A flaw has been found in Tenda A21 1.0.0.0. Impacted is the function form_fast_setting_wifi_set of the file /goform/fast_setting_wifi_set. Executing a manipulation of the argument ssid can lead to sta
CWE-119 — Weakness Type
Published: Feb 21, 2026  ·  Modified: Feb 28, 2026  ·  Source: NVD
CVSS v3
8.8
🔗 NVD Official
📄 Description (English)

A flaw has been found in Tenda A21 1.0.0.0. Impacted is the function form_fast_setting_wifi_set of the file /goform/fast_setting_wifi_set. Executing a manipulation of the argument ssid can lead to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been published and may be used.

🤖 AI Executive Summary

A critical stack-based buffer overflow vulnerability exists in Tenda A21 router firmware version 1.0.0.0 affecting the WiFi configuration function. The vulnerability can be exploited remotely through manipulation of the SSID parameter, allowing unauthenticated attackers to execute arbitrary code. 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 22, 2026 22:55
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi organizations across multiple sectors: Banking and Financial Services (SAMA-regulated institutions) using Tenda routers for network infrastructure; Government agencies and NCA-regulated entities; Healthcare facilities relying on these routers for medical device connectivity; Energy sector (ARAMCO and related entities) using Tenda equipment in operational networks; Telecommunications providers (STC, Mobily, Zain) and their infrastructure; Educational institutions and research centers. The remote exploitability without authentication makes this particularly dangerous for organizations with internet-facing Tenda devices.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Healthcare and Medical Services Energy and Utilities Telecommunications Education and Research Retail and E-commerce Manufacturing
⚖️ Saudi Risk Score (AI)
8.9
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda A21 devices running firmware version 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. Disable remote management features on affected routers
4. Implement network segmentation to restrict access to router management interfaces

PATCHING GUIDANCE:
1. Download the latest firmware patch from Tenda's official support portal
2. Backup current router configuration before patching
3. Apply firmware update through router's web interface or management console
4. Verify successful patch installation by checking firmware version post-update
5. Test network connectivity and WiFi functionality after patching

COMPENSATING CONTROLS (if patching delayed):
1. Implement firewall rules to block unauthorized access to router management ports (typically 80, 443, 8080)
2. Restrict SSID broadcast and implement MAC address filtering
3. Change default router credentials to strong, unique passwords
4. Monitor router logs for suspicious configuration attempts
5. Implement IDS/IPS rules to detect buffer overflow exploitation attempts

DETECTION RULES:
1. Monitor for HTTP POST requests to /goform/fast_setting_wifi_set with abnormally long SSID parameters (>32 characters)
2. Alert on any SSID parameter values containing special characters or binary data
3. Track failed authentication attempts to router management interface
4. Monitor for unexpected router reboots or configuration changes
5. Implement YARA rules to detect malicious payloads in network traffic targeting this endpoint
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda A21 التي تعمل بإصدار البرنامج الثابت 1.0.0.0 في شبكتك باستخدام أدوات المسح
2. عزل الأجهزة المتأثرة عن القطاعات الحرجة في الشبكة إذا لم يكن يمكن إكمال التصحيح فوراً
3. تعطيل ميزات الإدارة البعيدة على أجهزة التوجيه المتأثرة
4. تنفيذ تقسيم الشبكة لتقييد الوصول إلى واجهات إدارة جهاز التوجيه

إرشادات التصحيح:
1. تحميل أحدث تصحيح البرنامج الثابت من بوابة دعم Tenda الرسمية
2. عمل نسخة احتياطية من إعدادات جهاز التوجيه الحالية قبل التصحيح
3. تطبيق تحديث البرنامج الثابت من خلال واجهة الويب أو وحدة التحكم
4. التحقق من نجاح تثبيت التصحيح بفحص إصدار البرنامج الثابت بعد التحديث
5. اختبار اتصال الشبكة وعمل WiFi بعد التصحيح

الضوابط البديلة (إذا تأخر التصحيح):
1. تنفيذ قواعد جدار الحماية لحظر الوصول غير المصرح إلى منافذ إدارة جهاز التوجيه
2. تقييد بث SSID وتنفيذ تصفية عناوين MAC
3. تغيير بيانات اعتماد جهاز التوجيه الافتراضية إلى كلمات مرور قوية وفريدة
4. مراقبة سجلات جهاز التوجيه للمحاولات المريبة
5. تنفيذ قواعد IDS/IPS للكشف عن محاولات استغلال تجاوز المخزن المؤقت
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 - 5.1.1: Asset Management and Inventory Control ECC 2024 - 5.2.1: Vulnerability Management ECC 2024 - 5.3.1: Patch Management ECC 2024 - 5.4.1: Configuration Management ECC 2024 - 6.1.1: Access Control and Authentication
🔵 SAMA CSF
SAMA CSF - Identify: Asset Management (ID.AM-1, ID.AM-2) SAMA CSF - Protect: Access Control (PR.AC-1, PR.AC-2) SAMA CSF - Protect: Data Security (PR.DS-1) SAMA CSF - Detect: Anomalies and Events (DE.AE-1, DE.AE-2) SAMA CSF - Respond: Response Planning (RS.RP-1)
🟡 ISO 27001:2022
ISO 27001:2022 - A.5.19: Vulnerability Management ISO 27001:2022 - A.8.1: User Endpoint Devices ISO 27001:2022 - A.8.2: Privileged Access Rights ISO 27001:2022 - A.8.6: Access Control for Change Management ISO 27001:2022 - A.12.6: Management of Technical Vulnerabilities
🟣 PCI DSS v4.0.1
PCI DSS 4.0 - Requirement 6.2: Security patches and updates PCI DSS 4.0 - Requirement 11.2: Vulnerability scanning PCI DSS 4.0 - Requirement 1.1: Network segmentation
📦 Affected Products / CPE 1 entries
tenda:a21_firmware:1.0.0.0
📊 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
Exploit ✓ Yes
Patch ✓ Yes
Published 2026-02-21
Source Feed nvd
Views 5
🇸🇦 Saudi Risk Score
8.9
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
exploit-available CWE-119
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