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Global vulnerability Multiple sectors CRITICAL 1h Global vulnerability Information Technology / Software Infrastructure CRITICAL 1h Global data_breach Healthcare CRITICAL 2h Global data_breach Mobile Technology / Consumer Electronics HIGH 2h Global ransomware Cybersecurity Services / Multiple Sectors CRITICAL 2h Global apt Cryptocurrency and Blockchain CRITICAL 3h Global malware Financial Services, Mobile Payments HIGH 4h Global vulnerability Government and Critical Infrastructure CRITICAL 6h Global apt Cryptocurrency and Blockchain CRITICAL 14h Global malware Financial Services / Cryptocurrency CRITICAL 15h Global vulnerability Multiple sectors CRITICAL 1h Global vulnerability Information Technology / Software Infrastructure CRITICAL 1h Global data_breach Healthcare CRITICAL 2h Global data_breach Mobile Technology / Consumer Electronics HIGH 2h Global ransomware Cybersecurity Services / Multiple Sectors CRITICAL 2h Global apt Cryptocurrency and Blockchain CRITICAL 3h Global malware Financial Services, Mobile Payments HIGH 4h Global vulnerability Government and Critical Infrastructure CRITICAL 6h Global apt Cryptocurrency and Blockchain CRITICAL 14h Global malware Financial Services / Cryptocurrency CRITICAL 15h Global vulnerability Multiple sectors CRITICAL 1h Global vulnerability Information Technology / Software Infrastructure CRITICAL 1h Global data_breach Healthcare CRITICAL 2h Global data_breach Mobile Technology / Consumer Electronics HIGH 2h Global ransomware Cybersecurity Services / Multiple Sectors CRITICAL 2h Global apt Cryptocurrency and Blockchain CRITICAL 3h Global malware Financial Services, Mobile Payments HIGH 4h Global vulnerability Government and Critical Infrastructure CRITICAL 6h Global apt Cryptocurrency and Blockchain CRITICAL 14h Global malware Financial Services / Cryptocurrency CRITICAL 15h
Vulnerabilities

CVE-2021-36741

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Trend Micro Multiple Products Improper Input Validation Vulnerability — Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security contain an improper input validation vulnerability
Published: Nov 3, 2021  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Trend Micro Multiple Products Improper Input Validation Vulnerability — Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security contain an improper input validation vulnerability that allows a remote attacker to upload files.

🤖 AI Executive Summary

Trend Micro Apex One and related products contain a critical improper input validation vulnerability (CVE-2021-36741, CVSS 9.0) allowing remote attackers to upload arbitrary files without authentication. This vulnerability poses an immediate threat to organizations using these endpoint protection solutions across Saudi Arabia, potentially enabling malware deployment, lateral movement, and system compromise. Exploitation is actively occurring in the wild with public exploits available.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 21, 2026 00:35
🇸🇦 Saudi Arabia Impact Assessment
Critical impact on Saudi banking sector (SAMA-regulated institutions), government agencies (NCA oversight), healthcare organizations (MOH), energy sector (ARAMCO, SEC), and telecommunications (STC, Mobily). Trend Micro Apex One is widely deployed across Saudi enterprises as primary endpoint protection. Successful exploitation could lead to complete endpoint compromise, data exfiltration, ransomware deployment, and supply chain attacks affecting critical infrastructure. Government and financial institutions face highest risk due to regulatory compliance requirements and sensitive data handling.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Healthcare Energy and Utilities Telecommunications Manufacturing Retail and E-commerce Education
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all systems running Trend Micro Apex One, Apex One as a Service, or Worry-Free Business Security using asset inventory tools
2. Isolate affected systems from network if exploitation is suspected
3. Review Trend Micro console logs for suspicious file upload activities and unauthorized access attempts
4. Check for indicators of compromise: unexpected files in system directories, suspicious process execution, network connections to unknown IPs

PATCHING GUIDANCE:
1. Apply Trend Micro security patches immediately (prioritize production systems)
2. For Apex One: Update to version 14.0 SP1 or later
3. For Apex One as a Service: Patches deployed automatically; verify console shows latest version
4. For Worry-Free Business Security: Update to version 9.0 SP3 or later
5. Test patches in non-production environment first, then deploy to production

COMPENSATING CONTROLS (if immediate patching not possible):
1. Implement network segmentation to restrict access to Trend Micro management console
2. Restrict administrative access to console via IP whitelisting
3. Disable unnecessary file upload features if available
4. Monitor network traffic for suspicious uploads to Trend Micro services
5. Implement Web Application Firewall (WAF) rules to block malicious file uploads

DETECTION RULES:
1. Monitor for HTTP POST requests to Trend Micro console with suspicious file extensions (.exe, .dll, .ps1, .bat, .cmd)
2. Alert on file uploads to Trend Micro directories from unexpected sources
3. Track failed authentication attempts followed by successful file uploads
4. Monitor for process execution from Trend Micro temporary directories
5. Implement YARA rules for known malware signatures uploaded via this vulnerability
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع الأنظمة التي تعمل بـ Trend Micro Apex One باستخدام أدوات جرد الأصول
2. عزل الأنظمة المتأثرة عن الشبكة في حالة الاشتباه بالاستغلال
3. مراجعة سجلات وحدة تحكم Trend Micro للأنشطة المريبة برفع الملفات
4. التحقق من مؤشرات الاختراق: الملفات غير المتوقعة، تنفيذ العمليات المريبة

إرشادات التصحيح:
1. تطبيق تحديثات أمان Trend Micro فوراً
2. لـ Apex One: التحديث إلى الإصدار 14.0 SP1 أو أحدث
3. لـ Apex One as a Service: التحديثات مطبقة تلقائياً
4. لـ Worry-Free Business Security: التحديث إلى الإصدار 9.0 SP3 أو أحدث
5. اختبار التحديثات في بيئة غير الإنتاج أولاً

الضوابط البديلة (إذا لم يكن التصحيح الفوري ممكناً):
1. تطبيق تقسيم الشبكة لتقييد الوصول إلى وحدة تحكم Trend Micro
2. تقييد الوصول الإداري عبر قائمة بيضاء للعناوين
3. تعطيل ميزات رفع الملفات غير الضرورية
4. مراقبة حركة الشبكة للرفع المريب
5. تطبيق قواعد جدار حماية تطبيقات الويب

قواعد الكشف:
1. مراقبة طلبات HTTP POST المريبة برفع الملفات
2. تنبيهات على رفع الملفات من مصادر غير متوقعة
3. تتبع محاولات المصادقة الفاشلة متبوعة برفع ملفات ناجح
4. مراقبة تنفيذ العمليات من مجلدات Trend Micro المؤقتة
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.12.6.1 - Management of technical vulnerabilities ECC 2024 A.14.2.1 - Secure development policy ECC 2024 A.12.2.1 - Monitoring and logging ECC 2024 A.13.1.1 - Network security perimeter
🔵 SAMA CSF
SAMA CSF ID.BE-1 - Asset management and inventory SAMA CSF PR.IP-12 - Software, firmware, and information integrity SAMA CSF DE.CM-1 - Detection processes and tools SAMA CSF RS.MI-2 - Incident response and recovery
🟡 ISO 27001:2022
ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities ISO 27001:2022 A.14.2.1 - Secure development, test and acceptance ISO 27001:2022 A.12.2.1 - Monitoring ISO 27001:2022 A.8.1.1 - Inventory of assets
🟣 PCI DSS v4.0
PCI DSS 6.2 - Security patches and updates PCI DSS 11.2 - Vulnerability scanning PCI DSS 12.2 - Configuration standards
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Trend Micro:Apex One, Apex One as a Service, and Worry-Free Business Security
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS0.58%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2021-11-17
Published 2021-11-03
Source Feed cisa_kev
Views 3
🇸🇦 Saudi Risk Score
9.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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