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Global vulnerability Multiple sectors CRITICAL 28m Global vulnerability Information Technology / Software Infrastructure CRITICAL 30m Global data_breach Healthcare CRITICAL 45m Global data_breach Mobile Technology / Consumer Electronics HIGH 1h Global ransomware Cybersecurity Services / Multiple Sectors CRITICAL 1h Global apt Cryptocurrency and Blockchain CRITICAL 1h Global malware Financial Services, Mobile Payments HIGH 2h Global vulnerability Government and Critical Infrastructure CRITICAL 5h Global apt Cryptocurrency and Blockchain CRITICAL 13h Global malware Financial Services / Cryptocurrency CRITICAL 13h Global vulnerability Multiple sectors CRITICAL 28m Global vulnerability Information Technology / Software Infrastructure CRITICAL 30m Global data_breach Healthcare CRITICAL 45m Global data_breach Mobile Technology / Consumer Electronics HIGH 1h Global ransomware Cybersecurity Services / Multiple Sectors CRITICAL 1h Global apt Cryptocurrency and Blockchain CRITICAL 1h Global malware Financial Services, Mobile Payments HIGH 2h Global vulnerability Government and Critical Infrastructure CRITICAL 5h Global apt Cryptocurrency and Blockchain CRITICAL 13h Global malware Financial Services / Cryptocurrency CRITICAL 13h Global vulnerability Multiple sectors CRITICAL 28m Global vulnerability Information Technology / Software Infrastructure CRITICAL 30m Global data_breach Healthcare CRITICAL 45m Global data_breach Mobile Technology / Consumer Electronics HIGH 1h Global ransomware Cybersecurity Services / Multiple Sectors CRITICAL 1h Global apt Cryptocurrency and Blockchain CRITICAL 1h Global malware Financial Services, Mobile Payments HIGH 2h Global vulnerability Government and Critical Infrastructure CRITICAL 5h Global apt Cryptocurrency and Blockchain CRITICAL 13h Global malware Financial Services / Cryptocurrency CRITICAL 13h
Vulnerabilities

CVE-2021-26411

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Microsoft Internet Explorer Memory Corruption Vulnerability — Microsoft Internet Explorer contains an unspecified vulnerability that allows for memory corruption.
Published: Nov 3, 2021  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Microsoft Internet Explorer Memory Corruption Vulnerability — Microsoft Internet Explorer contains an unspecified vulnerability that allows for memory corruption.

🤖 AI Executive Summary

A critical memory corruption vulnerability in Microsoft Internet Explorer (CVSS 9.0) allows remote attackers to execute arbitrary code through specially crafted web content. With public exploits available and widespread IE usage in Saudi government and banking sectors, this poses an immediate threat to organizational security. Immediate patching is essential to prevent potential data breaches and system compromise.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 20, 2026 08:50
🇸🇦 Saudi Arabia Impact Assessment
Critical impact on Saudi banking sector (SAMA-regulated institutions, major banks using IE for legacy systems), government agencies (NCA, ministries relying on IE), healthcare providers, and energy sector (ARAMCO subsidiaries). Telecom operators (STC, Mobily) managing critical infrastructure are at high risk. Legacy systems in government and financial institutions running unpatched IE versions are particularly vulnerable to remote code execution attacks.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Healthcare Energy and Utilities Telecommunications Education Insurance
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all systems running Microsoft Internet Explorer across your organization
2. Prioritize patching for government, banking, and critical infrastructure systems
3. Apply latest Windows security updates containing IE patches immediately
4. For systems unable to patch immediately, disable IE or restrict access to untrusted websites

PATCHING GUIDANCE:
1. Deploy Windows Update KB patches for affected IE versions (IE 9, 10, 11)
2. Verify patch installation with 'winver' command and Windows Update history
3. Test patched systems for application compatibility before full deployment
4. Consider upgrading to Microsoft Edge as a long-term solution

COMPENSATING CONTROLS:
1. Implement web content filtering to block malicious sites
2. Deploy endpoint detection and response (EDR) solutions
3. Enable Windows Defender Exploit Guard and Attack Surface Reduction rules
4. Restrict IE usage through Group Policy (disable for non-essential users)
5. Implement network segmentation to isolate legacy systems

DETECTION RULES:
1. Monitor for iexplore.exe process crashes or unexpected memory access patterns
2. Alert on suspicious script execution from IE processes
3. Track Windows Update failures related to IE patches
4. Monitor for CVE-2021-26411 exploitation attempts in web logs and IDS/IPS systems
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع الأنظمة التي تعمل بـ Microsoft Internet Explorer في المنظمة
2. إعطاء الأولوية لتصحيح الأنظمة الحكومية والمصرفية والبنية التحتية الحرجة
3. تطبيق أحدث تحديثات أمان Windows التي تحتوي على تصحيحات IE فوراً
4. للأنظمة غير القادرة على التصحيح فوراً، قم بتعطيل IE أو تقييد الوصول إلى المواقع غير الموثوقة

إرشادات التصحيح:
1. نشر تحديثات Windows KB للإصدارات المتأثرة من IE (IE 9, 10, 11)
2. التحقق من تثبيت التصحيح باستخدام أمر 'winver' وسجل Windows Update
3. اختبار الأنظمة المصححة لتوافق التطبيقات قبل النشر الكامل
4. النظر في الترقية إلى Microsoft Edge كحل طويل الأجل

الضوابط البديلة:
1. تنفيذ تصفية محتوى الويب لحجب المواقع الضارة
2. نشر حلول كشف الاستجابة على نقاط النهاية (EDR)
3. تفعيل Windows Defender Exploit Guard وقواعد تقليل سطح الهجوم
4. تقييد استخدام IE من خلال Group Policy (تعطيل المستخدمين غير الأساسيين)
5. تنفيذ تقسيم الشبكة لعزل الأنظمة القديمة

قواعد الكشف:
1. مراقبة أعطال عملية iexplore.exe أو أنماط الوصول إلى الذاكرة غير المتوقعة
2. التنبيه على تنفيذ البرامج النصية المريبة من عمليات IE
3. تتبع فشل Windows Update المتعلقة بتصحيحات IE
4. مراقبة محاولات استغلال CVE-2021-26411 في سجلات الويب وأنظمة IDS/IPS
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information Security Policies and Procedures A.6.2.1 - Authorized Access to Information and Other Assets A.12.2.1 - Restrictions on Software Installation A.12.6.1 - Management of Technical Vulnerabilities
🔵 SAMA CSF
ID.RA-1 - Asset Management and Vulnerability Management PR.IP-12 - System and Information Integrity DE.CM-8 - Vulnerability Scans RS.MI-2 - Incident Response and Recovery
🟡 ISO 27001:2022
A.12.6.1 - Management of technical vulnerabilities A.14.2.1 - Secure development policy A.12.2.1 - Restrictions on software installation A.12.3.1 - Information backup
🟣 PCI DSS v4.0
Requirement 6.2 - Ensure security patches are installed Requirement 11.2 - Run automated vulnerability scans Requirement 6.1 - Maintain secure development processes
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Microsoft:Internet Explorer
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS92.47%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2021-11-17
Published 2021-11-03
Source Feed cisa_kev
Views 1
🇸🇦 Saudi Risk Score
9.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited ransomware
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