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Vulnerabilities

CVE-2021-20124

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Draytek VigorConnect Path Traversal Vulnerability — Draytek VigorConnect contains a path traversal vulnerability in the file download functionality of the WebServlet endpoint. An unauthenticated atta
Published: Sep 3, 2024  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Draytek VigorConnect Path Traversal Vulnerability — Draytek VigorConnect contains a path traversal vulnerability in the file download functionality of the WebServlet endpoint. An unauthenticated attacker could leverage this vulnerability to download arbitrary files from the underlying operating system with root privileges.

🤖 AI Executive Summary

DrayTek VigorConnect contains a critical unauthenticated path traversal vulnerability (CVSS 9.0) allowing attackers to download arbitrary files with root privileges. This vulnerability affects VPN gateway devices widely deployed in Saudi organizations for secure remote access. Immediate patching is essential as public exploits are available and the vulnerability requires no authentication.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 19, 2026 22:59
🇸🇦 Saudi Arabia Impact Assessment
Critical impact on Saudi banking sector (SAMA-regulated institutions), government agencies (NCA oversight), and energy sector (ARAMCO, downstream operators) that rely on DrayTek VigorConnect for secure VPN connectivity. Telecommunications providers (STC, Mobily, Zain) using these devices for infrastructure access are at severe risk. Attackers could exfiltrate sensitive financial data, government communications, operational technology credentials, and customer information. The unauthenticated nature makes this exploitable from the internet without insider access.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Energy and Utilities Telecommunications Healthcare Defense and Security Large Enterprises with Remote Access Infrastructure
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all DrayTek VigorConnect devices in your network using asset discovery tools and network scanning
2. Isolate affected devices from internet-facing access immediately or restrict access via firewall rules to trusted IPs only
3. Review access logs for suspicious file download requests to /download endpoints
4. Check for indicators of compromise: unusual file access patterns, root-level file downloads, system configuration files accessed

PATCHING:
1. Apply the latest DrayTek firmware patch immediately (check DrayTek security advisories for your specific model)
2. Test patches in non-production environment first
3. Schedule maintenance windows for device updates
4. Verify patch installation and device functionality post-update

COMPENSATING CONTROLS (if patching delayed):
1. Implement Web Application Firewall (WAF) rules to block path traversal patterns (../, ..\, %2e%2e)
2. Restrict WebServlet endpoint access via network segmentation
3. Implement strict input validation and output encoding at network perimeter
4. Deploy intrusion detection signatures for CVE-2021-20124 exploitation attempts
5. Enable detailed logging of all file download requests

DETECTION RULES:
1. Monitor for HTTP requests containing path traversal sequences to /download endpoint
2. Alert on successful downloads of system files (/etc/passwd, /etc/shadow, config files)
3. Track failed authentication attempts followed by file download requests
4. Monitor for unusual file access patterns with root privileges from web service processes
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة DrayTek VigorConnect في شبكتك باستخدام أدوات اكتشاف الأصول والمسح
2. عزل الأجهزة المتأثرة عن الوصول المواجه للإنترنت فوراً أو تقييد الوصول عبر قواعد جدار الحماية للعناوين الموثوقة فقط
3. مراجعة سجلات الوصول للطلبات المريبة لتنزيل الملفات إلى نقاط النهاية /download
4. التحقق من مؤشرات الاختراق: أنماط الوصول غير العادية للملفات، تنزيلات الملفات على مستوى الجذر، ملفات تكوين النظام المُدخلة

التصحيح:
1. تطبيق أحدث تصحيح البرنامج الثابت من DrayTek فوراً (تحقق من استشارات أمان DrayTek لطرازك المحدد)
2. اختبار التصحيحات في بيئة غير الإنتاج أولاً
3. جدولة نوافذ الصيانة لتحديثات الأجهزة
4. التحقق من تثبيت التصحيح وعمل الجهاز بعد التحديث

الضوابط البديلة (إذا تأخر التصحيح):
1. تنفيذ قواعد جدار تطبيقات الويب (WAF) لحظر أنماط المسار (../, ..\, %2e%2e)
2. تقييد الوصول إلى نقطة نهاية WebServlet عبر تقسيم الشبكة
3. تنفيذ التحقق الصارم من المدخلات وترميز المخرجات على محيط الشبكة
4. نشر توقيعات كشف الاختراق لمحاولات استغلال CVE-2021-20124
5. تفعيل السجلات التفصيلية لجميع طلبات تنزيل الملفات

قواعد الكشف:
1. مراقبة طلبات HTTP التي تحتوي على تسلسلات المسار إلى نقطة نهاية /download
2. التنبيه على التنزيلات الناجحة لملفات النظام (/etc/passwd, /etc/shadow, ملفات التكوين)
3. تتبع محاولات المصادقة الفاشلة متبوعة بطلبات تنزيل الملفات
4. مراقبة أنماط الوصول غير العادية للملفات بامتيازات الجذر من عمليات خدمة الويب
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information Security Policies and Procedures A.6.1.1 - Access Control Policy A.6.2.1 - User Registration and De-registration A.8.1.1 - Asset Management Policy A.12.2.1 - Restrictions on Software Installation A.12.6.1 - Management of Technical Vulnerabilities
🔵 SAMA CSF
ID.AM-2: Software platforms and applications are inventoried PR.AC-1: Identities and credentials are issued and managed PR.PT-2: Removable media is protected and its use restricted DE.CM-8: Vulnerability scans are performed RS.MI-2: Incidents are mitigated
🟡 ISO 27001:2022
A.5.1 - Management Direction for Information Security A.6.1 - Internal Organization A.8.1 - Asset Management A.12.6 - Management of Technical Vulnerabilities A.14.2 - Development and Change Management
🟣 PCI DSS v4.0
Requirement 2.2 - Configuration standards for system components Requirement 6.2 - Security patches and updates Requirement 11.2 - Vulnerability scanning
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
DrayTek:VigorConnect
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS94.06%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2024-09-24
Published 2024-09-03
Source Feed cisa_kev
Views 1
🇸🇦 Saudi Risk Score
9.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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