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Vulnerabilities

CVE-2021-1879

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerability — Apple iOS, iPadOS, and watchOS WebKit contain an unspecified vulnerability that allows for universal cross-site scripti
Published: Nov 3, 2021  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerability — Apple iOS, iPadOS, and watchOS WebKit contain an unspecified vulnerability that allows for universal cross-site scripting (XSS) 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-2021-1879 is a critical universal XSS vulnerability in WebKit affecting Apple iOS, iPadOS, and watchOS with a CVSS score of 9.0. The vulnerability allows attackers to execute arbitrary JavaScript through maliciously crafted web content, potentially compromising user data and device security. With public exploits available, this poses an immediate threat to Saudi organizations and individuals using Apple devices for business and personal use.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 19, 2026 20:50
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi banking sector (SAMA-regulated institutions), government agencies (NCA oversight), and healthcare organizations using iOS devices for secure communications and data access. Telecom operators (STC, Mobily, Zain) face risks from compromised user devices on their networks. Energy sector (ARAMCO) employees using iOS devices for remote access are vulnerable. The widespread use of iPhones and iPads in Saudi Arabia for business purposes makes this a high-impact vulnerability affecting confidentiality and integrity of sensitive organizational data.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Healthcare Energy and Utilities Telecommunications Education Retail and E-commerce
⚖️ Saudi Risk Score (AI)
8.8
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Identify all iOS, iPadOS, and watchOS devices in your organization using device management systems
2. Disable WebKit-based applications or restrict access to untrusted websites until patching is complete
3. Alert users to avoid clicking suspicious links or visiting untrusted websites

Patching Guidance:
1. Update all affected devices to iOS 14.5 or later, iPadOS 14.5 or later, and watchOS 7.4 or later
2. Enable automatic updates in Settings > General > Software Update > Automatic Updates
3. Prioritize patching for devices accessing sensitive business systems

Compensating Controls:
1. Implement Mobile Device Management (MDM) to enforce security policies
2. Deploy Web Content Filtering to block known malicious domains
3. Use VPN for all remote access to corporate resources
4. Implement application whitelisting to restrict browser usage

Detection Rules:
1. Monitor for unusual JavaScript execution patterns in browser logs
2. Alert on unexpected network connections from Safari or WebKit processes
3. Track failed certificate validation attempts
4. Monitor for DOM manipulation and cookie exfiltration attempts
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة iOS و iPadOS و watchOS في مؤسستك باستخدام أنظمة إدارة الأجهزة
2. تعطيل تطبيقات WebKit أو تقييد الوصول إلى المواقع غير الموثوقة حتى اكتمال التصحيح
3. تنبيه المستخدمين لتجنب النقر على الروابط المريبة أو زيارة المواقع غير الموثوقة

إرشادات التصحيح:
1. تحديث جميع الأجهزة المتأثرة إلى iOS 14.5 أو أحدث و iPadOS 14.5 أو أحدث و watchOS 7.4 أو أحدث
2. تفعيل التحديثات التلقائية في الإعدادات > عام > تحديث البرنامج > التحديثات التلقائية
3. إعطاء الأولوية لتصحيح الأجهزة التي تصل إلى الأنظمة التجارية الحساسة

الضوابط البديلة:
1. تنفيذ إدارة أجهزة الجوال (MDM) لفرض سياسات الأمان
2. نشر تصفية محتوى الويب لحظر النطاقات الضارة المعروفة
3. استخدام VPN لجميع الوصول عن بعد إلى موارد الشركة
4. تنفيذ قائمة بيضاء للتطبيقات لتقييد استخدام المتصفح

قواعد الكشف:
1. مراقبة أنماط تنفيذ JavaScript غير العادية في سجلات المتصفح
2. التنبيه على الاتصالات الشبكية غير المتوقعة من عمليات Safari أو WebKit
3. تتبع محاولات التحقق من الشهادات الفاشلة
4. مراقبة محاولات معالجة DOM وسرقة ملفات تعريف الارتباط
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information Security Policies A.6.1.1 - Organization of Information Security A.8.1.1 - User Endpoint Devices A.8.2.1 - User Access Management A.12.6.1 - Management of Technical Vulnerabilities
🔵 SAMA CSF
ID.RA-1 - Asset Management PR.DS-1 - Data Security PR.PT-1 - Security Architecture DE.CM-1 - Detection and Analysis RS.MI-1 - Incident Response
🟡 ISO 27001:2022
A.5.1 - Management Direction A.8.1 - User Endpoint Devices A.12.6 - Management of Technical Vulnerabilities A.14.2 - Development Security
🟣 PCI DSS v4.0
Requirement 6.2 - Security Patches Requirement 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
EPSS1.50%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2021-11-17
Published 2021-11-03
Source Feed cisa_kev
Views 1
🇸🇦 Saudi Risk Score
8.8
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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