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Vulnerabilities

CVE-2021-30858

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Apple iOS, iPadOS, macOS Use-After-Free Vulnerability — Apple iOS, iPadOS, and macOS WebKit contain a use-after-free vulnerability that leads to code execution when processing maliciously crafted web
Published: Nov 3, 2021  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Apple iOS, iPadOS, macOS Use-After-Free Vulnerability — Apple iOS, iPadOS, and macOS WebKit contain a use-after-free vulnerability that leads to code execution when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.

🤖 AI Executive Summary

CVE-2021-30858 is a critical use-after-free vulnerability in WebKit affecting Apple iOS, iPadOS, and macOS with a CVSS score of 9.0. Successful exploitation through maliciously crafted web content enables arbitrary code execution on affected devices. With publicly available exploits and widespread device adoption across Saudi organizations, this vulnerability poses an immediate and severe threat requiring urgent patching.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 20, 2026 15:31
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses critical risk to Saudi banking sector (SAMA-regulated institutions, payment processors), government agencies (NCA, ministries), healthcare organizations, and energy sector (ARAMCO, utilities). High-value targets including financial institutions, critical infrastructure operators, and government entities using iOS/macOS devices are at elevated risk. Telecom operators (STC, Mobily, Zain) managing enterprise networks face significant exposure. The vulnerability enables remote code execution without user interaction beyond visiting a malicious website, making it particularly dangerous for organizations with BYOD policies or mobile-first operations.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Healthcare and Medical Services Energy and Utilities Telecommunications Critical Infrastructure Defense and Security Education
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all iOS, iPadOS, and macOS devices in your organization using asset management tools
2. Disable WebKit-based browsers (Safari) on non-critical devices until patching is complete
3. Block access to untrusted websites via web filtering and DNS controls
4. Implement network segmentation to isolate critical systems

PATCHING GUIDANCE:
1. Apply Apple security updates immediately: iOS 14.7+, iPadOS 14.7+, macOS 11.5+, macOS 12+
2. Prioritize patching for devices accessing sensitive financial/government systems
3. Test patches in non-production environment before enterprise rollout
4. Establish mandatory update policies with 48-72 hour compliance windows

COMPENSATING CONTROLS (if immediate patching not possible):
1. Deploy Mobile Device Management (MDM) to enforce Safari restrictions
2. Implement application whitelisting to prevent unauthorized code execution
3. Enable Content Security Policy (CSP) headers on internal web applications
4. Deploy endpoint detection and response (EDR) solutions on macOS devices
5. Monitor for suspicious process execution and memory access patterns

DETECTION RULES:
1. Monitor for WebKit process crashes followed by unexpected child process spawning
2. Alert on Safari/WebKit accessing suspicious memory regions
3. Track unusual network connections initiated from Safari process
4. Monitor for exploitation indicators: heap spray patterns, ROP gadget chains
5. Log all WebKit-related security events in SIEM with correlation rules
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة iOS و iPadOS و macOS في المنظمة باستخدام أدوات إدارة الأصول
2. تعطيل متصفحات WebKit (Safari) على الأجهزة غير الحرجة حتى اكتمال التصحيح
3. حظر الوصول إلى المواقع غير الموثوقة عبر تصفية الويب وعناصم التحكم في DNS
4. تنفيذ تقسيم الشبكة لعزل الأنظمة الحرجة

إرشادات التصحيح:
1. تطبيق تحديثات أمان Apple فوراً: iOS 14.7+ و iPadOS 14.7+ و macOS 11.5+ و macOS 12+
2. إعطاء الأولوية لتصحيح الأجهزة التي تصل إلى الأنظمة المالية/الحكومية الحساسة
3. اختبار التصحيحات في بيئة غير الإنتاج قبل النشر على مستوى المؤسسة
4. إنشاء سياسات تحديث إلزامية مع نوافذ امتثال 48-72 ساعة

الضوابط البديلة (إذا لم يكن التصحيح الفوري ممكناً):
1. نشر إدارة الأجهزة المحمولة (MDM) لفرض قيود Safari
2. تنفيذ قائمة بيضاء للتطبيقات لمنع تنفيذ الكود غير المصرح به
3. تفعيل رؤوس سياسة أمان المحتوى (CSP) على تطبيقات الويب الداخلية
4. نشر حلول الكشف والاستجابة للنقاط النهائية (EDR) على أجهزة macOS
5. مراقبة أنماط تنفيذ العمليات المريبة والوصول إلى الذاكرة

قواعد الكشف:
1. مراقبة أعطال عملية WebKit متبوعة بتوليد عملية فرعية غير متوقعة
2. تنبيه عند وصول Safari/WebKit إلى مناطق ذاكرة مريبة
3. تتبع الاتصالات الشبكية غير العادية التي تبدأ من عملية Safari
4. مراقبة مؤشرات الاستغلال: أنماط رش الكومة وسلاسل ROP
5. تسجيل جميع أحداث أمان WebKit في SIEM مع قواعد الارتباط
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information security policies and procedures A.8.1.1 - User endpoint devices security A.8.2.1 - User access management A.12.2.1 - Change management procedures A.12.6.1 - Management of technical vulnerabilities
🔵 SAMA CSF
ID.RA-1 - Asset management and vulnerability identification PR.IP-12 - Security patch management DE.CM-8 - Vulnerability scanning and management RS.MI-2 - Incident response and containment
🟡 ISO 27001:2022
A.12.6.1 - Management of technical vulnerabilities A.14.2.1 - Secure development policy A.12.2.1 - Change management A.16.1.5 - Response to information security incidents
🟣 PCI DSS v4.0
6.2 - Security patches and updates 6.1 - Secure development processes 11.2 - Vulnerability scanning
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Apple:iOS, iPadOS, and macOS
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS0.79%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2021-11-17
Published 2021-11-03
Source Feed cisa_kev
Views 2
🇸🇦 Saudi Risk Score
9.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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