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Vulnerabilities

CVE-2026-2930

Medium
A vulnerability was identified in Tenda A18 15.13.07.13. The affected element is the function webCgiGetUploadFile of the file /cgi-bin/UploadCfg of the component Httpd Service. Such manipulation of th
CWE-119 — Weakness Type
Published: Feb 22, 2026  ·  Modified: Feb 28, 2026  ·  Source: NVD
CVSS v3
6.3
🔗 NVD Official
📄 Description (English)

A vulnerability was identified in Tenda A18 15.13.07.13. The affected element is the function webCgiGetUploadFile of the file /cgi-bin/UploadCfg of the component Httpd Service. Such manipulation of the argument boundary leads to stack-based buffer overflow. The attack can be executed remotely. The exploit is publicly available and might be used.

🤖 AI Executive Summary

A stack-based buffer overflow vulnerability exists in Tenda A18 router firmware (version 15.13.07.13) affecting the HTTP upload functionality. The vulnerability can be exploited remotely through manipulation of the boundary parameter in the UploadCfg endpoint, potentially allowing unauthorized code execution. With a CVSS score of 6.3 and no patch currently available, this poses a significant risk to organizations relying on Tenda networking equipment.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 17, 2026 01:33
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability primarily impacts Saudi organizations in the following sectors: (1) Government agencies and NCA infrastructure using Tenda routers for network connectivity; (2) Banking and financial institutions (SAMA-regulated) utilizing Tenda equipment in branch networks or remote office deployments; (3) Telecommunications providers (STC, Mobily, Zain) using Tenda equipment in network infrastructure; (4) Healthcare facilities relying on Tenda routers for medical device connectivity; (5) Energy sector (ARAMCO and utilities) using Tenda equipment in operational technology networks. The lack of available patches creates immediate risk for all deployed instances.
🏢 Affected Saudi Sectors
Government and Public Administration Banking and Financial Services Telecommunications Healthcare Energy and Utilities Education Retail and E-commerce
⚖️ Saudi Risk Score (AI)
7.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Inventory all Tenda A18 devices running firmware version 15.13.07.13 across your organization
2. Isolate affected devices from internet-facing networks where possible
3. Implement network segmentation to restrict access to the /cgi-bin/UploadCfg endpoint
4. Monitor for suspicious HTTP POST requests with unusual boundary parameters

COMPENSATING CONTROLS (until patch available):
5. Deploy Web Application Firewall (WAF) rules to block requests to /cgi-bin/UploadCfg with malformed boundary parameters
6. Implement strict input validation and rate limiting on HTTP upload endpoints
7. Restrict administrative access to router management interfaces via IP whitelisting
8. Disable remote management features if not operationally required
9. Monitor router logs for failed upload attempts and unusual file operations

DETECTION RULES:
10. Alert on POST requests to /cgi-bin/UploadCfg with boundary parameter length exceeding normal thresholds
11. Monitor for stack-based buffer overflow indicators: unusual process behavior, memory access violations, or unexpected service restarts
12. Track firmware version compliance and flag any A18 devices not updated when patches become available

PATCHING STRATEGY:
13. Contact Tenda support for security updates and timeline for patch release
14. Prepare upgrade procedures and test in non-production environments immediately upon patch availability
15. Establish expedited patching schedule for this vulnerability once fixes are released
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. قم بحصر جميع أجهزة Tenda A18 التي تعمل بإصدار البرنامج الثابت 15.13.07.13 في جميع أنحاء المنظمة
2. عزل الأجهزة المتأثرة عن الشبكات المتصلة بالإنترنت حيثما أمكن
3. تطبيق تقسيم الشبكة لتقييد الوصول إلى نقطة نهاية /cgi-bin/UploadCfg
4. مراقبة طلبات HTTP POST المريبة ذات معاملات الحدود غير العادية

الضوابط التعويضية (حتى توفر التصحيح):
5. نشر قواعد جدار حماية تطبيقات الويب (WAF) لحظر الطلبات إلى /cgi-bin/UploadCfg ذات معاملات الحدود المشوهة
6. تطبيق التحقق الصارم من المدخلات وتحديد معدل الطلبات على نقاط نهاية تحميل HTTP
7. تقييد الوصول الإداري إلى واجهات إدارة التوجيه عبر قائمة بيضاء للعناوين
8. تعطيل ميزات الإدارة البعيدة إذا لم تكن مطلوبة تشغيلياً
9. مراقبة سجلات التوجيه للبحث عن محاولات التحميل الفاشلة والعمليات غير العادية

قواعد الكشف:
10. تنبيهات على طلبات POST إلى /cgi-bin/UploadCfg مع معامل الحدود الذي يتجاوز الحدود الطبيعية
11. مراقبة مؤشرات تجاوز سعة المخزن المؤقت: السلوك غير العادي للعملية أو انتهاكات الوصول إلى الذاكرة أو إعادة تشغيل الخدمة غير المتوقعة
12. تتبع توافق إصدار البرنامج الثابت وتحديد أي أجهزة A18 لم يتم تحديثها عند توفر التصحيحات

استراتيجية التصحيح:
13. اتصل بدعم Tenda للحصول على تحديثات الأمان والجدول الزمني لإصدار التصحيح
14. تحضير إجراءات الترقية والاختبار في بيئات غير الإنتاج فوراً عند توفر التصحيحات
15. إنشاء جدول زمني معجل لتصحيح هذه الثغرة بمجرد إصدار الإصلاحات
📋 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.12.2.1 - Monitoring and logging of network activities
🔵 SAMA CSF
SAMA CSF ID.RA-1 - Asset Management and Vulnerability Assessment SAMA CSF PR.IP-12 - Security patch management SAMA CSF DE.CM-1 - Detection and monitoring of anomalous activities
🟡 ISO 27001:2022
ISO 27001:2022 A.12.2.1 - Monitoring and logging ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities ISO 27001:2022 A.14.2.1 - Secure development and change management
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security patches must be installed within defined timeframe PCI DSS 11.2 - Vulnerability scanning and assessment
📦 Affected Products / CPE 1 entries
tenda:a18_firmware:15.13.07.13
📊 CVSS Score
6.3
/ 10.0 — Medium
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredL — Low / Local
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityL — Low / Local
IntegrityL — Low / Local
AvailabilityL — Low / Local
📋 Quick Facts
Severity Medium
CVSS Score6.3
CWECWE-119
EPSS0.05%
Exploit No
Patch ✗ No
Published 2026-02-22
Source Feed nvd
Views 5
🇸🇦 Saudi Risk Score
7.2
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-119
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