📄 Description (English)
Adobe Acrobat and Reader Use-After-Free Vulnerability — Adobe Acrobat and Reader contains a use-after-free vulnerability that could allow an unauthenticated attacker to achieve code execution in the context of the current user.
🤖 AI Executive Summary
CVE-2021-28550 is a critical use-after-free vulnerability in Adobe Acrobat and Reader (CVSS 9.0) that enables unauthenticated remote code execution through malicious PDF files. With publicly available exploits and widespread use of Adobe products across Saudi organizations, this vulnerability poses an immediate and severe threat to government, banking, and enterprise environments. Immediate patching is essential to prevent potential data breaches and system compromise.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 20, 2026 13:15
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses critical risk to Saudi banking sector (SAMA-regulated institutions), government agencies (NCA, ministries), healthcare organizations, and energy sector (ARAMCO). PDF-based attacks are particularly dangerous in Saudi business culture where document sharing is prevalent. Financial institutions face elevated risk of data exfiltration and fraud. Government agencies handling classified documents are at severe risk. Telecom operators (STC, Mobily) and critical infrastructure operators are also vulnerable through supply chain and business communication channels.
🏢 Affected Saudi Sectors
Banking and Financial Services
Government and Public Administration
Healthcare
Energy and Utilities
Telecommunications
Insurance
Legal Services
Education
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all systems running Adobe Acrobat and Reader versions prior to 2021.001.20138 (Reader) and 2021.001.20149 (Acrobat)
2. Disable PDF preview functionality in email clients and file explorers as temporary mitigation
3. Block execution of PDFs from untrusted sources via endpoint controls
4. Alert users to avoid opening PDF attachments from unknown senders
PATCHING GUIDANCE:
1. Deploy Adobe security updates immediately: Reader 2021.001.20138+ or Acrobat 2021.001.20149+
2. For legacy versions (2020.x, 2017.x), apply corresponding security patches
3. Prioritize patching on systems handling sensitive financial/government documents
4. Test patches in non-production environment before enterprise deployment
COMPENSATING CONTROLS:
1. Implement application whitelisting to restrict PDF reader execution
2. Deploy sandboxing solutions for PDF processing
3. Enable Protected View in Adobe Reader for all documents
4. Implement network-level PDF inspection and filtering
5. Monitor for suspicious PDF file characteristics (embedded scripts, suspicious objects)
DETECTION RULES:
1. Monitor for Adobe Reader/Acrobat process crashes or unexpected terminations
2. Alert on PDF files with embedded JavaScript or suspicious objects
3. Track unusual memory access patterns in Adobe processes
4. Monitor for child processes spawned from Adobe Reader/Acrobat
5. Log all PDF file access from network shares and email systems
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع الأنظمة التي تعمل بإصدارات Adobe Acrobat و Reader السابقة للإصدار 2021.001.20138
2. تعطيل وظيفة معاينة PDF في عملاء البريد الإلكتروني كتدبير مؤقت
3. حظر تنفيذ ملفات PDF من مصادر غير موثوقة عبر عناصر التحكم في نقاط النهاية
4. تنبيه المستخدمين لتجنب فتح مرفقات PDF من مرسلين مجهولين
إرشادات التصحيح:
1. نشر تحديثات أمان Adobe فوراً: Reader 2021.001.20138+ أو Acrobat 2021.001.20149+
2. للإصدارات القديمة (2020.x، 2017.x)، تطبيق تصحيحات الأمان المقابلة
3. إعطاء الأولوية لتصحيح الأنظمة التي تتعامل مع المستندات المالية/الحكومية الحساسة
4. اختبار التصحيحات في بيئة غير الإنتاج قبل النشر على مستوى المؤسسة
الضوابط البديلة:
1. تطبيق قائمة بيضاء للتطبيقات لتقييد تنفيذ قارئ PDF
2. نشر حلول الحماية الرملية لمعالجة PDF
3. تفعيل Protected View في Adobe Reader لجميع المستندات
4. تطبيق فحص وتصفية PDF على مستوى الشبكة
5. مراقبة خصائص ملفات PDF المريبة
قواعد الكشف:
1. مراقبة أعطال عمليات Adobe Reader/Acrobat
2. التنبيه على ملفات PDF التي تحتوي على JavaScript مريب
3. تتبع أنماط الوصول إلى الذاكرة غير العادية
4. مراقبة العمليات الفرعية المنبثقة من Adobe Reader/Acrobat
5. تسجيل جميع عمليات الوصول إلى ملفات PDF من الأسهم والبريد الإلكتروني
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information Security Policies and Procedures
A.6.2.1 - Restriction of Access to Information
A.12.2.1 - Controls Against Malware
A.12.6.1 - Management of Technical Vulnerabilities
A.14.2.1 - Secure Development Policy
🔵 SAMA CSF
ID.RA-1 - Asset Management and Vulnerability Management
PR.IP-12 - Software, Firmware, and Information Integrity Mechanisms
DE.CM-8 - Vulnerability Scans
RS.MI-2 - Incidents are mitigated
🟡 ISO 27001:2022
A.12.6.1 - Management of technical vulnerabilities
A.14.2.1 - Secure development policy and procedures
A.12.2.1 - Controls against malware
A.6.2.1 - User access management
🟣 PCI DSS v4.0
6.2 - Ensure all system components and software are protected from known vulnerabilities
6.1 - Establish a process to identify and assign a risk rating to newly discovered security vulnerabilities
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Adobe:Acrobat and Reader