📄 Description (English)
Adobe Acrobat and Reader Heap-based Buffer Overflow Vulnerability — Acrobat Acrobat and Reader contain a heap-based buffer overflow vulnerability that could allow an unauthenticated attacker to achieve code execution in the context of the current user.
🤖 AI Executive Summary
CVE-2021-21017 is a critical heap-based buffer overflow vulnerability in Adobe Acrobat and Reader (CVSS 9.0) that enables unauthenticated remote code execution when users open malicious PDF documents. With public exploits available and widespread use of Adobe products across Saudi organizations, this poses an immediate and severe threat to enterprise security. Patching is urgent and should be prioritized across all affected systems.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 19, 2026 22:57
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses critical risk to Saudi banking sector (SAMA-regulated institutions), government agencies (NCA oversight), healthcare organizations, and energy sector (ARAMCO and subsidiaries). Telecom operators (STC, Mobily, Zain) and financial services are particularly vulnerable due to heavy reliance on PDF document processing for compliance, reporting, and customer communications. Threat actors could target organizations through spear-phishing campaigns with malicious PDFs to establish initial access for data exfiltration or lateral movement.
🏢 Affected Saudi Sectors
Banking and Financial Services
Government and Public Administration
Healthcare and Medical Services
Energy and Utilities (ARAMCO, subsidiaries)
Telecommunications (STC, Mobily, Zain)
Insurance
Legal Services
Education
Manufacturing
🎯 MITRE ATT&CK Techniques
T1566.001 - Phishing: Spearphishing Attachment
T1203 - Exploitation for Client Execution
T1055 - Process Injection
T1059.001 - Command and Scripting Interpreter: PowerShell
T1059.003 - Command and Scripting Interpreter: Windows Command Shell
T1190 - Exploit Public-Facing Application
T1547.001 - Boot or Logon Autostart Execution: Registry Run Keys
T1547.009 - Boot or Logon Autostart Execution: Shortcut Modification
T1140 - Deobfuscate/Decode Files or Information
T1005 - Data from Local System
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all systems running Adobe Acrobat and Reader across the organization using asset inventory tools
2. Disable PDF opening in email clients as a temporary measure until patching is complete
3. Block suspicious PDF attachments at email gateways using content filtering rules
4. Alert users not to open PDF attachments from untrusted sources
PATCHING GUIDANCE:
1. Apply Adobe security updates immediately (versions 2020.013.20074 or later for Acrobat DC, 2020.013.20074 or later for Reader)
2. Prioritize patching for systems in high-risk departments (finance, legal, executive offices)
3. Test patches in non-production environment before enterprise deployment
4. Implement automated patch management for future Adobe updates
COMPENSATING CONTROLS:
1. Deploy application whitelisting to restrict PDF reader execution
2. Implement sandboxing for PDF processing using isolated virtual environments
3. Enable Protected View in Adobe Reader to restrict functionality of untrusted documents
4. Use endpoint detection and response (EDR) solutions to monitor for suspicious process behavior
DETECTION RULES:
1. Monitor for abnormal Adobe Reader/Acrobat process spawning (cmd.exe, powershell.exe)
2. Alert on heap memory corruption patterns in Adobe processes
3. Track file access patterns for suspicious PDF modifications
4. Monitor network connections initiated by Adobe Reader processes to unknown destinations
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع الأنظمة التي تقوم بتشغيل Adobe Acrobat و Reader باستخدام أدوات جرد الأصول
2. تعطيل فتح ملفات PDF في عملاء البريد الإلكتروني كإجراء مؤقت
3. حظر مرفقات PDF المريبة على بوابات البريد الإلكتروني
4. تنبيه المستخدمين بعدم فتح مرفقات PDF من مصادر غير موثوقة
إرشادات التصحيح:
1. تطبيق تحديثات أمان Adobe فوراً (الإصدارات 2020.013.20074 أو أحدث)
2. إعطاء الأولوية لتصحيح الأنظمة في الأقسام عالية المخاطر
3. اختبار التصحيحات في بيئة غير الإنتاج قبل النشر
4. تنفيذ إدارة التصحيحات الآلية
الضوابط البديلة:
1. نشر قائمة التطبيقات المسموحة لتقييد تنفيذ قارئ PDF
2. تنفيذ الحماية الرملية لمعالجة PDF
3. تفعيل Protected View في Adobe Reader
4. استخدام حلول كشف الاستجابة على نقطة النهاية (EDR)
قواعد الكشف:
1. مراقبة عمليات Adobe Reader/Acrobat غير الطبيعية
2. التنبيه على أنماط تلف الذاكرة
3. تتبع أنماط الوصول إلى الملفات المريبة
4. مراقبة الاتصالات الشبكية من عمليات Adobe Reader
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information security policies and procedures
A.5.2.1 - User access management and authentication
A.5.2.3 - Access rights review and revocation
A.6.1.1 - Cryptographic controls for data protection
A.6.2.1 - Physical and logical access controls
A.7.1.1 - Event logging and monitoring
A.7.1.2 - Protection of log information
A.8.1.1 - Incident response procedures
A.8.1.3 - Assessment and decision on security incidents
🔵 SAMA CSF
Governance - Risk Management Framework
Governance - Third-party Risk Management
Protective - Access Control and Authentication
Protective - Endpoint Protection and Hardening
Protective - Vulnerability Management
Detective - Security Monitoring and Logging
Detective - Threat Detection and Analysis
Responsive - Incident Response and Management
🟡 ISO 27001:2022
A.5.1.1 - Policies for information security
A.6.1.1 - Information security roles and responsibilities
A.6.2.1 - Information security awareness, education and training
A.7.1.1 - Cryptography
A.8.1.1 - User endpoint devices
A.8.1.3 - Information and other assets associated with information processing facilities
A.8.2.1 - Classification of information
A.8.3.1 - Handling of assets
A.12.2.1 - Restrictions on software installation
A.12.6.1 - Management of technical vulnerabilities
🟣 PCI DSS v4.0
Requirement 2.2.4 - Configure system security parameters
Requirement 6.2 - Ensure security patches are installed
Requirement 6.2.1 - Maintain inventory of system components
Requirement 11.2 - Run automated vulnerability scans
Requirement 12.2.1 - Implement change control procedures
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Adobe:Acrobat and Reader