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Vulnerabilities

CVE-2026-5688

High
CWE-77 — Weakness Type
Published: Apr 6, 2026  ·  Modified: Apr 13, 2026  ·  Source: NVD
CVSS v3
7.3
🔗 NVD Official
📄 Description (English)

A security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. Impacted is the function setDdnsCfg of the file /cgi-bin/cstecgi.cgi. Such manipulation of the argument provider leads to os command injection. The attack may be launched remotely. The exploit has been disclosed publicly and may be used.

🤖 AI Executive Summary

A critical OS command injection vulnerability exists in Totolik A7100RU router firmware (version 7.4cu.2313_b20191024) affecting the DDNS configuration function. The vulnerability allows remote attackers to execute arbitrary system commands through the 'provider' parameter, potentially compromising network infrastructure. With no patch available and public exploit disclosure, this poses immediate risk to organizations using affected routers.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 7, 2026 17:54
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability primarily impacts Saudi telecommunications providers (STC, Mobily, Zain) and government agencies using Totolik routers for network infrastructure. Banking sector organizations and healthcare facilities relying on these routers for network connectivity face significant risk of unauthorized access and data exfiltration. Energy sector (ARAMCO) and critical infrastructure operators using affected equipment are at elevated risk. Small and medium enterprises across all sectors utilizing these routers as primary network devices are vulnerable to complete network compromise.
🏢 Affected Saudi Sectors
Telecommunications (STC, Mobily, Zain) Banking and Financial Services Government and Public Administration Healthcare Energy (ARAMCO) Critical Infrastructure Small and Medium Enterprises
⚖️ Saudi Risk Score (AI)
8.7
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Totolik A7100RU devices running firmware version 7.4cu.2313_b20191024 in your network inventory
2. Isolate affected routers from critical network segments if possible
3. Implement network segmentation to limit lateral movement from compromised devices
4. Enable enhanced logging and monitoring on affected devices

PATCHING GUIDANCE:
1. Check Totolik's official website for firmware updates beyond version 7.4cu.2313_b20191024
2. If updates available, schedule immediate patching during maintenance windows
3. Test patches in isolated lab environment before production deployment

COMPENSATING CONTROLS (if no patch available):
1. Restrict access to /cgi-bin/cstecgi.cgi endpoint using firewall rules
2. Implement Web Application Firewall (WAF) rules to block suspicious DDNS configuration requests
3. Disable DDNS functionality if not required for operations
4. Implement strict input validation and sanitization at network perimeter
5. Monitor for command injection patterns: pipe characters (|), command substitution ($(), backticks), semicolons (;), && operators

DETECTION RULES:
1. Monitor HTTP POST requests to /cgi-bin/cstecgi.cgi with 'setDdnsCfg' function calls
2. Alert on 'provider' parameter containing shell metacharacters or suspicious strings
3. Track failed authentication attempts to router management interfaces
4. Monitor outbound connections from router to unusual destinations
5. Implement IDS/IPS signatures for OS command injection patterns in DDNS requests
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Totolik A7100RU التي تعمل بإصدار البرنامج الثابت 7.4cu.2313_b20191024 في جرد الشبكة
2. عزل أجهزة التوجيه المتأثرة عن أجزاء الشبكة الحرجة إن أمكن
3. تنفيذ تقسيم الشبكة لتحديد الحركة الجانبية من الأجهزة المخترقة
4. تفعيل السجلات المحسنة والمراقبة على الأجهزة المتأثرة

إرشادات التصحيح:
1. التحقق من موقع Totolik الرسمي للحصول على تحديثات البرنامج الثابت بعد الإصدار 7.4cu.2313_b20191024
2. إذا كانت التحديثات متاحة، جدولة التصحيح الفوري أثناء نوافذ الصيانة
3. اختبار التصحيحات في بيئة معملية معزولة قبل نشرها في الإنتاج

الضوابط البديلة (إذا لم يكن هناك تصحيح متاح):
1. تقييد الوصول إلى نقطة نهاية /cgi-bin/cstecgi.cgi باستخدام قواعد جدار الحماية
2. تنفيذ قواعد جدار تطبيقات الويب لحظر طلبات تكوين DDNS المريبة
3. تعطيل وظيفة DDNS إذا لم تكن مطلوبة للعمليات
4. تنفيذ التحقق من صحة الإدخال والتطهير الصارم على محيط الشبكة
5. مراقبة أنماط حقن الأوامر: أحرف الأنابيب (|)، استبدال الأوامر ($())، الفواصل المنقوطة (;)، عوامل &&

قواعد الكشف:
1. مراقبة طلبات HTTP POST إلى /cgi-bin/cstecgi.cgi مع استدعاءات وظيفة 'setDdnsCfg'
2. التنبيه على معامل 'provider' يحتوي على أحرف shell أو سلاسل مريبة
3. تتبع محاولات المصادقة الفاشلة لواجهات إدارة جهاز التوجيه
4. مراقبة الاتصالات الصادرة من جهاز التوجيه إلى وجهات غير عادية
5. تنفيذ توقيعات IDS/IPS لأنماط حقن أوامر نظام التشغيل في طلبات DDNS
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Network security perimeter controls ECC 2024 A.5.2.1 - Access control to network resources ECC 2024 A.5.3.1 - Segregation of networks ECC 2024 A.6.2.1 - Vulnerability management and patching ECC 2024 A.6.2.2 - Security testing and assessment
🔵 SAMA CSF
SAMA CSF ID.BE-1 - Asset management SAMA CSF PR.AC-1 - Access control policy SAMA CSF PR.DS-6 - Data security and integrity SAMA CSF DE.CM-1 - Detection and analysis SAMA CSF RS.MI-1 - Incident response and recovery
🟡 ISO 27001:2022
ISO 27001:2022 A.5.1 - Policies for information security ISO 27001:2022 A.5.2 - Information security roles and responsibilities ISO 27001:2022 A.6.1 - Screening and assessment 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
🟣 PCI DSS v4.0.1
PCI DSS 1.1 - Firewall configuration standards PCI DSS 2.1 - Default security parameters PCI DSS 6.2 - Security patches and updates PCI DSS 11.3 - Penetration testing
📊 CVSS Score
7.3
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityL — Low / Local
IntegrityL — Low / Local
AvailabilityL — Low / Local
📋 Quick Facts
Severity High
CVSS Score7.3
CWECWE-77
EPSS2.96%
Exploit No
Patch ✗ No
Published 2026-04-06
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
8.7
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
CWE-77
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