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Vulnerabilities

CVE-2020-9818

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Apple iOS, iPadOS, and watchOS Out-of-Bounds Write Vulnerability — Apple iOS, iPadOS, and watchOS Mail contains an out-of-bounds write vulnerability which may allow memory modification or application
Published: Nov 3, 2021  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Apple iOS, iPadOS, and watchOS Out-of-Bounds Write Vulnerability — Apple iOS, iPadOS, and watchOS Mail contains an out-of-bounds write vulnerability which may allow memory modification or application termination when processing a maliciously crafted mail message.

🤖 AI Executive Summary

CVE-2020-9818 is a critical out-of-bounds write vulnerability in Apple Mail affecting iOS, iPadOS, and watchOS with a CVSS score of 9.0. An attacker can craft a malicious email message to trigger memory corruption, potentially leading to arbitrary code execution or application crash. This vulnerability poses significant risk to Saudi government, banking, and enterprise users who rely on Apple devices for secure communications.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 19, 2026 18:32
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability directly impacts Saudi banking sector (SAMA-regulated institutions), government agencies (NCA, Ministry of Interior), healthcare organizations, and energy sector (ARAMCO) personnel using Apple devices. The Mail application is widely used for business communications in these sectors. Exploitation could lead to unauthorized access to sensitive communications, data exfiltration, or lateral movement within enterprise networks. Saudi telecommunications operators (STC, Mobily) supporting enterprise customers are also at risk.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Healthcare and Medical Services Energy and Petroleum Telecommunications Defense and Security Education
⚖️ Saudi Risk Score (AI)
8.7
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all iOS, iPadOS, and watchOS devices in your organization using Apple Mail
2. Disable Mail application access until patching is complete, or restrict email to web-based alternatives (Outlook Web Access, Gmail web interface)
3. Implement email gateway filtering to block suspicious attachments and malformed messages

PATCHING GUIDANCE:
1. Update to iOS 13.5 or later, iPadOS 13.5 or later, or watchOS 6.2.5 or later
2. Enable automatic updates in Settings > General > Software Update > Automatic Updates
3. Prioritize patching for devices used by government, banking, and healthcare personnel

COMPENSATING CONTROLS:
1. Deploy Mobile Device Management (MDM) to enforce Mail app restrictions
2. Implement network segmentation to isolate compromised devices
3. Enable two-factor authentication on all email accounts
4. Monitor for suspicious process execution and memory access patterns

DETECTION RULES:
1. Monitor for Mail application crashes or unexpected terminations
2. Alert on unusual memory access patterns in Mail process
3. Track email messages with malformed headers or oversized attachments
4. Monitor for post-exploitation indicators: unauthorized file access, network connections from Mail process
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة iOS و iPadOS و watchOS في مؤسستك التي تستخدم Apple Mail
2. تعطيل وصول تطبيق Mail حتى اكتمال التصحيح، أو تقييد البريد الإلكتروني للبدائل المستندة إلى الويب
3. تنفيذ تصفية بوابة البريد الإلكتروني لحظر المرفقات المريبة والرسائل المشوهة

إرشادات التصحيح:
1. التحديث إلى iOS 13.5 أو أحدث، iPadOS 13.5 أو أحدث، أو watchOS 6.2.5 أو أحدث
2. تفعيل التحديثات التلقائية في الإعدادات > عام > تحديث البرنامج > التحديثات التلقائية
3. إعطاء الأولوية للتصحيح للأجهزة التي يستخدمها موظفو الحكومة والبنوك والرعاية الصحية

الضوابط البديلة:
1. نشر إدارة الأجهزة المحمولة (MDM) لفرض قيود تطبيق Mail
2. تنفيذ تقسيم الشبكة لعزل الأجهزة المخترقة
3. تفعيل المصادقة متعددة العوامل على جميع حسابات البريد الإلكتروني
4. مراقبة أنماط الوصول إلى الذاكرة والتنفيذ المريب

قواعد الكشف:
1. مراقبة أعطال تطبيق Mail أو الإنهاء غير المتوقع
2. التنبيه على أنماط الوصول إلى الذاكرة غير العادية في عملية Mail
3. تتبع رسائل البريد الإلكتروني ذات الرؤوس المشوهة أو المرفقات الكبيرة
4. مراقبة مؤشرات ما بعد الاستغلال: الوصول غير المصرح به للملفات والاتصالات الشبكية من عملية Mail
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Information Security Policies and Procedures ECC 2024 A.6.1.1 - Access Control and Authentication ECC 2024 A.8.1.1 - Asset Management and Inventory ECC 2024 A.12.2.1 - Change Management and Patch Management ECC 2024 A.12.6.1 - Management of Technical Vulnerabilities
🔵 SAMA CSF
SAMA CSF ID.BE-1 - Business Environment SAMA CSF PR.AC-1 - Access Control SAMA CSF PR.PT-2 - Protective Technology SAMA CSF DE.CM-1 - Detection and Analysis SAMA CSF RS.MI-1 - Incident Response and Recovery
🟡 ISO 27001:2022
ISO 27001:2022 A.5.1 - Policies for Information Security ISO 27001:2022 A.8.1 - Asset Management ISO 27001:2022 A.12.6 - Management of Technical Vulnerabilities ISO 27001:2022 A.14.2 - Change Management
🟣 PCI DSS v4.0
PCI DSS 6.2 - Security Patches and Updates PCI DSS 11.2 - Vulnerability Scanning
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Apple:iOS, iPadOS, and watchOS
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS0.25%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2022-05-03
Published 2021-11-03
Source Feed cisa_kev
Views 1
🇸🇦 Saudi Risk Score
8.7
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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