📄 Description (English)
Heap-based buffer overflow in Windows Cryptographic Services allows an authorized attacker to elevate privileges locally.
🤖 AI Executive Summary
CVE-2026-40377 is a heap-based buffer overflow in Windows Cryptographic Services affecting multiple Windows 10 versions, allowing authorized local attackers to escalate privileges. With a CVSS score of 7.8 and no patch currently available, this vulnerability poses a significant risk to Saudi organizations relying on Windows infrastructure. The vulnerability requires local access but can lead to complete system compromise through privilege escalation.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: May 18, 2026 21:55
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability directly impacts Saudi government agencies (NCA, NCSC), banking sector (SAMA-regulated institutions, major banks), healthcare organizations (MOH facilities), energy sector (ARAMCO, SEC), and telecommunications providers (STC, Mobily). Windows 10 is widely deployed across these critical sectors. The privilege escalation capability is particularly dangerous in environments where administrative controls are critical for compliance with SAMA CSF and NCA ECC 2024 requirements. Organizations with legacy Windows 10 deployments (versions 1607, 1809) face elevated risk due to extended support timelines.
🏢 Affected Saudi Sectors
Banking & Financial Services
Government & Public Administration
Healthcare
Energy & Utilities
Telecommunications
Defense & Security
Education
Transportation
🎯 MITRE ATT&CK Techniques
T1548.004 — Abuse Elevation Control Mechanism: Bypass User Account Control
T1190 — Exploit Public-Facing Application
T1068 — Exploitation for Privilege Escalation
T1547.001 — Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder
T1547.008 — Boot or Logon Autostart Execution: LSASS Driver
T1134.003 — Access Token Manipulation: Make and Impersonate Token
T1055 — Process Injection
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Inventory all Windows 10 systems across affected versions (1607, 1809, 21H2, 22H2) in your environment
2. Prioritize systems with cryptographic services enabled or handling sensitive data
3. Implement application whitelisting to restrict execution of unsigned cryptographic service modifications
4. Enable Windows Defender Application Guard for high-risk systems
COMPENSATING CONTROLS (until patch available):
5. Restrict local administrative access using principle of least privilege
6. Implement Windows Defender Credential Guard to protect cached credentials
7. Enable User Account Control (UAC) with highest security settings
8. Deploy Windows Defender for Endpoint with behavioral threat detection enabled
9. Monitor Event Viewer for cryptographic service anomalies (Event IDs: 4688, 4689, 4703)
10. Restrict access to cryptographic service binaries using NTFS permissions
DETECTION RULES:
- Monitor for unusual heap memory allocation patterns in cryptographic processes (crypt32.dll, cryptsvc.exe)
- Alert on privilege escalation attempts from cryptographic service contexts
- Track modifications to cryptographic service registry keys (HKLM\System\CurrentControlSet\Services\CryptSvc)
- Monitor for abnormal child process creation from cryptographic services
PATCHING STRATEGY:
11. Subscribe to Microsoft Security Update Guide for CVE-2026-40377 patch release
12. Establish expedited patching timeline upon patch availability (target: 30 days for critical systems)
13. Test patches in isolated lab environment before production deployment
14. Plan staged rollout prioritizing systems handling financial/government data
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. قم بحصر جميع أنظمة Windows 10 عبر الإصدارات المتأثرة (1607، 1809، 21H2، 22H2) في بيئتك
2. أعط الأولوية للأنظمة التي تحتوي على خدمات التشفير المفعلة أو التي تتعامل مع البيانات الحساسة
3. تطبيق قائمة التطبيقات المسموحة لتقييد تنفيذ تعديلات خدمات التشفير غير الموقعة
4. تفعيل Windows Defender Application Guard للأنظمة عالية المخاطر
الضوابط البديلة (حتى توفر التصحيح):
5. تقييد الوصول الإداري المحلي باستخدام مبدأ الحد الأدنى من الامتيازات
6. تطبيق Windows Defender Credential Guard لحماية بيانات الاعتماد المخزنة مؤقتًا
7. تفعيل User Account Control (UAC) بأعلى إعدادات الأمان
8. نشر Windows Defender for Endpoint مع تفعيل كشف التهديدات السلوكية
9. مراقبة Event Viewer للشذوذ في خدمات التشفير (معرفات الأحداث: 4688، 4689، 4703)
10. تقييد الوصول إلى ملفات خدمات التشفير باستخدام أذونات NTFS
قواعد الكشف:
- مراقبة أنماط تخصيص الذاكرة العميقة غير العادية في عمليات التشفير (crypt32.dll، cryptsvc.exe)
- تنبيهات محاولات تصعيد الامتيازات من سياقات خدمات التشفير
- تتبع التعديلات على مفاتيح سجل خدمات التشفير (HKLM\System\CurrentControlSet\Services\CryptSvc)
- مراقبة إنشاء العمليات الفرعية غير الطبيعية من خدمات التشفير
استراتيجية التصحيح:
11. الاشتراك في دليل تحديث أمان Microsoft لإصدار تصحيح CVE-2026-40377
12. إنشاء جدول زمني معجل للتصحيح عند توفر التصحيح (الهدف: 30 يومًا للأنظمة الحرجة)
13. اختبار التصحيحات في بيئة معملية معزولة قبل نشرها في الإنتاج
14. التخطيط لنشر مرحلي يعطي الأولوية للأنظمة التي تتعامل مع البيانات المالية والحكومية
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 - 5.1.1 Access Control Policy
ECC 2024 - 5.2.1 User Registration and De-registration
ECC 2024 - 5.3.1 Privilege Management
ECC 2024 - 6.1.1 Cryptography Policy
ECC 2024 - 6.2.1 Cryptographic Controls Implementation
🔵 SAMA CSF
SAMA CSF - Governance & Risk Management (GRM-01: Risk Assessment)
SAMA CSF - Information Security (IS-02: Access Control)
SAMA CSF - Information Security (IS-03: Cryptography)
SAMA CSF - Resilience (RES-01: System Resilience)
SAMA CSF - Incident Management (IM-01: Incident Detection)
🟡 ISO 27001:2022
ISO 27001:2022 - A.5.2 Information security policies
ISO 27001:2022 - A.8.2 Privileged access rights
ISO 27001:2022 - A.8.3 Information access restriction
ISO 27001:2022 - A.10.1 Cryptography
ISO 27001:2022 - A.12.6 Change management
🟣 PCI DSS v4.0.1
PCI DSS 4.0 - Requirement 2: Apply Secure Configurations
PCI DSS 4.0 - Requirement 6: Develop and Maintain Secure Systems
PCI DSS 4.0 - Requirement 7: Restrict Access to Data
PCI DSS 4.0 - Requirement 8: Identify and Authenticate Access
📦 Affected Products / CPE 25 entries
microsoft:windows_10_1607
microsoft:windows_10_1607
microsoft:windows_10_1809
microsoft:windows_10_1809
microsoft:windows_10_21h2
microsoft:windows_10_21h2
microsoft:windows_10_21h2
microsoft:windows_10_22h2
microsoft:windows_10_22h2
microsoft:windows_10_22h2
microsoft:windows_11_23h2
microsoft:windows_11_23h2
microsoft:windows_11_24h2
microsoft:windows_11_24h2
microsoft:windows_11_25h2
microsoft:windows_11_25h2
microsoft:windows_11_26h1
microsoft:windows_11_26h1
microsoft:windows_server_2012:-
microsoft:windows_server_2012:r2
microsoft:windows_server_2016
microsoft:windows_server_2019
microsoft:windows_server_2022
microsoft:windows_server_2022_23h2
microsoft:windows_server_2025