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Vulnerabilities

CVE-2021-47960

Medium
CWE-552 — Weakness Type
Published: Apr 10, 2026  ·  Modified: Apr 13, 2026  ·  Source: NVD
CVSS v3
6.5
🔗 NVD Official
📄 Description (English)

A files or directories accessible to external parties vulnerability in Synology SSL VPN Client before 1.4.5-0684 allows remote attackers to access files within the installation directory via a local HTTP server bound to the loopback interface. By leveraging user interaction with a crafted web page, attackers may retrieve sensitive files such as configuration files, certificates, and logs, leading to information disclosure.

🤖 AI Executive Summary

CVE-2021-47960 is a local information disclosure vulnerability in Synology SSL VPN Client that exposes sensitive files through an insecure local HTTP server. Attackers can retrieve configuration files, certificates, and logs by tricking users into visiting malicious web pages. While requiring user interaction, this vulnerability poses significant risk to organizations using Synology VPN solutions for remote access, particularly in Saudi Arabia's banking and government sectors.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 11, 2026 01:02
🇸🇦 Saudi Arabia Impact Assessment
Saudi banking institutions (SAMA-regulated banks) and government agencies (NCA, NCSC) using Synology SSL VPN Client face significant risk of credential and certificate theft. Energy sector organizations (ARAMCO, downstream companies) relying on VPN for remote operations could experience unauthorized access to critical infrastructure data. Telecom providers (STC, Mobily) managing VPN infrastructure for enterprise customers are at risk. The vulnerability enables attackers to extract VPN certificates and configuration data, potentially leading to lateral movement and unauthorized access to critical systems.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Energy and Utilities Telecommunications Healthcare Defense and Security
⚖️ Saudi Risk Score (AI)
7.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Inventory all Synology SSL VPN Client installations across the organization and identify versions prior to 1.4.5-0684
2. Disable or restrict access to the local HTTP server if possible through Synology client settings
3. Implement network segmentation to limit loopback interface access
4. Educate users about phishing and malicious web pages that could trigger the vulnerability

Patching Guidance:
1. Upgrade Synology SSL VPN Client to version 1.4.5-0684 or later immediately
2. Verify patch deployment across all endpoints using MDM/endpoint management tools
3. Test VPN connectivity after patching to ensure business continuity

Compensating Controls:
1. Implement browser isolation or sandboxing for users accessing untrusted websites
2. Deploy web filtering to block known malicious domains
3. Monitor local HTTP traffic on loopback interface (127.0.0.1:port) for suspicious access patterns
4. Implement certificate pinning for VPN client communications
5. Rotate all VPN certificates and credentials immediately

Detection Rules:
1. Monitor for HTTP requests to 127.0.0.1 from browser processes
2. Alert on access to Synology VPN Client installation directory from web browsers
3. Track extraction of .conf, .pem, .crt, and .key files from VPN client directories
4. Monitor for unusual process execution from VPN client installation paths
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حصر جميع تثبيتات عميل Synology SSL VPN في المنظمة وتحديد الإصدارات السابقة للإصدار 1.4.5-0684
2. تعطيل أو تقييد الوصول إلى خادم HTTP المحلي إن أمكن من خلال إعدادات عميل Synology
3. تنفيذ تقسيم الشبكة لتحديد الوصول إلى واجهة loopback
4. تثقيف المستخدمين حول رسائل البريد الإلكتروني المزيفة والصفحات الويب الضارة التي قد تؤدي إلى الثغرة

إرشادات التصحيح:
1. ترقية عميل Synology SSL VPN إلى الإصدار 1.4.5-0684 أو أحدث فوراً
2. التحقق من نشر التصحيح عبر جميع نقاط النهاية باستخدام أدوات إدارة الأجهزة
3. اختبار اتصال VPN بعد التصحيح لضمان استمرارية العمل

الضوابط البديلة:
1. تنفيذ عزل المتصفح أو الحماية الرملية للمستخدمين الذين يصلون إلى مواقع ويب غير موثوقة
2. نشر تصفية الويب لحجب النطاقات الضارة المعروفة
3. مراقبة حركة HTTP المحلية على واجهة loopback للكشف عن أنماط الوصول المريبة
4. تنفيذ تثبيت الشهادات لاتصالات عميل VPN
5. تدوير جميع شهادات بيانات اعتماد VPN فوراً

قواعد الكشف:
1. مراقبة طلبات HTTP إلى 127.0.0.1 من عمليات المتصفح
2. التنبيه على الوصول إلى دليل تثبيت عميل Synology VPN من متصفحات الويب
3. تتبع استخراج ملفات .conf و .pem و .crt و .key من أدلة عميل VPN
4. مراقبة تنفيذ العمليات غير العادية من مسارات تثبيت عميل VPN
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information security policies and procedures A.6.1.1 - Access control policy A.8.1.1 - Asset management policy A.12.2.1 - Change management procedures A.13.1.1 - Network security policy
🔵 SAMA CSF
ID.AM-2 - Software inventory PR.AC-1 - Access control policy PR.PT-2 - Removable media protection DE.CM-1 - Network monitoring RS.MI-2 - Incident response procedures
🟡 ISO 27001:2022
A.5.1 - Management direction for information security A.6.1 - Internal organization A.8.1 - Asset management A.12.2 - Change management A.13.1 - Network security management A.14.2 - Development and support processes
🟣 PCI DSS v4.0.1
Requirement 2.1 - Default security parameters Requirement 6.2 - Security patches Requirement 8.1 - User identification Requirement 10.1 - Audit trails
📊 CVSS Score
6.5
/ 10.0 — Medium
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionR — Required
ScopeU — Unchanged
ConfidentialityH — High
IntegrityN — None / Network
AvailabilityN — None / Network
📋 Quick Facts
Severity Medium
CVSS Score6.5
CWECWE-552
EPSS0.03%
Exploit No
Patch ✗ No
Published 2026-04-10
Source Feed nvd
Views 5
🇸🇦 Saudi Risk Score
7.2
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-552
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