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Global phishing Financial Services, Technology, Multiple Sectors CRITICAL 3h Global insider Education HIGH 21h Global supply_chain Software Development and Technology HIGH 1d Global apt Government/Critical Infrastructure CRITICAL 1d Global vulnerability Enterprise Software / Data Analytics CRITICAL 1d Global vulnerability Artificial Intelligence and Technology HIGH 1d Global general Technology and Artificial Intelligence MEDIUM 1d Global general Technology and Artificial Intelligence HIGH 1d Global vulnerability Higher Education CRITICAL 1d Global data_breach Government HIGH 1d Global phishing Financial Services, Technology, Multiple Sectors CRITICAL 3h Global insider Education HIGH 21h Global supply_chain Software Development and Technology HIGH 1d Global apt Government/Critical Infrastructure CRITICAL 1d Global vulnerability Enterprise Software / Data Analytics CRITICAL 1d Global vulnerability Artificial Intelligence and Technology HIGH 1d Global general Technology and Artificial Intelligence MEDIUM 1d Global general Technology and Artificial Intelligence HIGH 1d Global vulnerability Higher Education CRITICAL 1d Global data_breach Government HIGH 1d Global phishing Financial Services, Technology, Multiple Sectors CRITICAL 3h Global insider Education HIGH 21h Global supply_chain Software Development and Technology HIGH 1d Global apt Government/Critical Infrastructure CRITICAL 1d Global vulnerability Enterprise Software / Data Analytics CRITICAL 1d Global vulnerability Artificial Intelligence and Technology HIGH 1d Global general Technology and Artificial Intelligence MEDIUM 1d Global general Technology and Artificial Intelligence HIGH 1d Global vulnerability Higher Education CRITICAL 1d Global data_breach Government HIGH 1d
Vulnerabilities

CVE-2021-47961

High
CWE-256 — Weakness Type
Published: Apr 10, 2026  ·  Modified: Apr 17, 2026  ·  Source: NVD
CVSS v3
8.1
🔗 NVD Official
📄 Description (English)

A plaintext storage of a password vulnerability in Synology SSL VPN Client before 1.4.5-0684 allows remote attackers to access or influence the user's PIN code due to insecure storage. This may lead to unauthorized VPN configuration and potential interception of subsequent VPN traffic when combined with user interaction.

🤖 AI Executive Summary

Synology SSL VPN Client versions before 1.4.5-0684 store user PIN codes in plaintext, allowing attackers with local access to extract credentials and compromise VPN connections. This vulnerability is particularly critical for Saudi organizations using Synology VPN solutions for remote workforce access, as compromised credentials could enable unauthorized network access and traffic interception. The lack of available patches requires immediate compensating controls and client updates.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 25, 2026 20:21
🇸🇦 Saudi Arabia Impact Assessment
Saudi banking sector (SAMA-regulated institutions) and government agencies (NCA oversight) using Synology VPN for secure remote access face significant risk of credential compromise. Telecom operators (STC, Mobily) managing VPN infrastructure for employee access are particularly vulnerable. Energy sector (ARAMCO, downstream operators) relying on VPN for operational technology access could experience unauthorized network penetration. Healthcare organizations using Synology solutions for telemedicine and remote consultations risk patient data exposure. The vulnerability affects any organization with local endpoint access, making it critical for organizations with hybrid workforce models prevalent in Saudi Arabia.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Telecommunications Energy and Utilities Healthcare Manufacturing Education
⚖️ Saudi Risk Score (AI)
7.8
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Audit all Synology SSL VPN Client installations and identify versions prior to 1.4.5-0684
2. Restrict local access to affected systems through endpoint security controls and physical access restrictions
3. Implement endpoint detection and response (EDR) solutions to monitor for credential extraction attempts
4. Force password/PIN resets for all VPN users immediately after patching

Patching Guidance:
1. Upgrade Synology SSL VPN Client to version 1.4.5-0684 or later as soon as available
2. Test patches in non-production environments before enterprise deployment
3. Prioritize patching for systems with administrative privileges and sensitive data access

Compensating Controls:
1. Enable multi-factor authentication (MFA) for VPN access to mitigate credential-only compromise
2. Implement VPN connection logging and monitoring for anomalous access patterns
3. Use encrypted credential storage solutions at the OS level (Windows Credential Manager, macOS Keychain)
4. Deploy host-based intrusion detection to flag plaintext credential access attempts
5. Implement network segmentation to limit lateral movement from compromised VPN sessions

Detection Rules:
1. Monitor for unauthorized access to Synology VPN Client configuration files (typically in %APPDATA% or ~/.config)
2. Alert on multiple failed VPN authentication attempts from single source
3. Flag VPN connections from unusual geographic locations or at unusual times
4. Monitor for process execution attempting to read VPN client memory or configuration files
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تدقيق جميع تثبيتات عميل Synology SSL VPN وتحديد الإصدارات السابقة للإصدار 1.4.5-0684
2. تقييد الوصول المحلي للأنظمة المتأثرة من خلال ضوابط أمان نقطة النهاية والقيود المادية
3. تنفيذ حلول الكشف والاستجابة للنقاط النهائية (EDR) لمراقبة محاولات استخراج بيانات الاعتماد
4. فرض إعادة تعيين كلمة المرور/PIN لجميع مستخدمي VPN فوراً بعد التصحيح

إرشادات التصحيح:
1. ترقية عميل Synology SSL VPN إلى الإصدار 1.4.5-0684 أو أحدث عند توفره
2. اختبار التصحيحات في بيئات غير الإنتاج قبل النشر على مستوى المؤسسة
3. إعطاء الأولوية لتصحيح الأنظمة ذات امتيازات إدارية والوصول إلى البيانات الحساسة

الضوابط التعويضية:
1. تفعيل المصادقة متعددة العوامل (MFA) لوصول VPN للتخفيف من خطر اختراق بيانات الاعتماد فقط
2. تنفيذ تسجيل وتراقبة اتصالات VPN للكشف عن أنماط الوصول الشاذة
3. استخدام حلول تخزين بيانات الاعتماد المشفرة على مستوى نظام التشغيل
4. نشر الكشف عن الاختراقات المستندة إلى المضيف لتحديد محاولات الوصول غير المصرح به
5. تنفيذ تقسيم الشبكة لتحديد الحركة الجانبية من جلسات VPN المخترقة

قواعد الكشف:
1. مراقبة الوصول غير المصرح به إلى ملفات تكوين عميل Synology SSL VPN
2. تنبيهات محاولات المصادقة الفاشلة المتعددة من مصدر واحد
3. تحديد اتصالات VPN من مواقع جغرافية غير عادية أو في أوقات غير عادية
4. مراقبة تنفيذ العمليات التي تحاول قراءة ذاكرة عميل VPN أو ملفات التكوين
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information security policies and procedures A.6.2.1 - User registration and de-registration A.8.2.3 - Password management A.9.2.1 - User access management A.10.1.1 - Cryptography policy
🔵 SAMA CSF
ID.AM-1 - Asset Management PR.AC-1 - Access Control Policy PR.DS-1 - Data Security Policy DE.CM-1 - Detection and Analysis
🟡 ISO 27001:2022
A.5.1.1 - Information security policies A.6.2.1 - User registration and access rights A.8.2.3 - Password management A.8.3.1 - Password quality requirements A.10.1.1 - Cryptographic controls
🟣 PCI DSS v4.0.1
Requirement 2.1 - Configuration standards Requirement 8.2.3 - Password strength Requirement 8.2.4 - Password management
📊 CVSS Score
8.1
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionR — Required
ScopeU — Unchanged
ConfidentialityH — High
IntegrityH — High
AvailabilityN — None / Network
📋 Quick Facts
Severity High
CVSS Score8.1
CWECWE-256
EPSS0.04%
Exploit No
Patch ✗ No
Published 2026-04-10
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
7.8
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-256
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