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Vulnerabilities

CVE-2020-6820

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Mozilla Firefox And Thunderbird Use-After-Free Vulnerability — Mozilla Firefox and Thunderbird contain a race condition vulnerability when handling a ReadableStream under certain conditions. The race
Published: Nov 3, 2021  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Mozilla Firefox And Thunderbird Use-After-Free Vulnerability — Mozilla Firefox and Thunderbird contain a race condition vulnerability when handling a ReadableStream under certain conditions. The race condition creates a use-after-free vulnerability, causing unspecified impacts.

🤖 AI Executive Summary

CVE-2020-6820 is a critical use-after-free vulnerability in Mozilla Firefox and Thunderbird affecting versions prior to Firefox 76 and Thunderbird 68.8. The vulnerability exploits a race condition in ReadableStream handling, allowing remote attackers to execute arbitrary code with user privileges. With a CVSS score of 9.0 and publicly available exploits, this poses an immediate threat to Saudi organizations relying on these browsers for secure communications and web access.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 19, 2026 13:56
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi government entities (NCA, MISA), banking sector (SAMA-regulated institutions, major banks), healthcare organizations, and energy sector (ARAMCO). Government employees using Firefox for secure communications and web access are at high risk. Financial institutions face potential data breach and unauthorized access risks. Telecommunications companies (STC, Mobily) and critical infrastructure operators relying on Firefox for administrative access are vulnerable to remote code execution attacks.
🏢 Affected Saudi Sectors
Government (NCA, MISA, Ministry of Interior) Banking and Financial Services (SAMA-regulated institutions) Healthcare Energy (ARAMCO, utilities) Telecommunications (STC, Mobily, Zain) Education Critical Infrastructure
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Firefox and Thunderbird installations across the organization using asset management tools
2. Disable Firefox and Thunderbird usage until patching is complete, or restrict to non-critical tasks only
3. Block malicious websites known to host exploits using web filtering

PATCHING GUIDANCE:
1. Update Firefox to version 76 or later immediately
2. Update Thunderbird to version 68.8 or later
3. Enable automatic updates in browser settings: Preferences > General > Updates
4. Verify patch installation by checking Help > About Firefox/Thunderbird

COMPENSATING CONTROLS (if immediate patching not possible):
1. Implement network segmentation to isolate affected systems
2. Deploy endpoint protection with behavioral analysis capabilities
3. Monitor for suspicious process execution and memory access patterns
4. Restrict user privileges to prevent privilege escalation
5. Disable JavaScript execution in Firefox if not required for business operations

DETECTION RULES:
1. Monitor for firefox.exe or thunderbird.exe spawning unexpected child processes
2. Alert on abnormal memory access patterns or heap corruption indicators
3. Track ReadableStream API calls in browser console logs
4. Monitor for suspicious network connections initiated by browser processes
5. Implement EDR rules detecting use-after-free exploitation patterns
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع تثبيتات Firefox و Thunderbird عبر المنظمة باستخدام أدوات إدارة الأصول
2. تعطيل استخدام Firefox و Thunderbird حتى اكتمال التصحيح، أو تقييد الاستخدام للمهام غير الحرجة فقط
3. حجب المواقع الضارة المعروفة التي تستضيف الاستغلالات باستخدام تصفية الويب

إرشادات التصحيح:
1. تحديث Firefox إلى الإصدار 76 أو أحدث على الفور
2. تحديث Thunderbird إلى الإصدار 68.8 أو أحدث
3. تفعيل التحديثات التلقائية في إعدادات المتصفح: التفضيلات > عام > التحديثات
4. التحقق من تثبيت التصحيح بالتحقق من المساعدة > حول Firefox/Thunderbird

الضوابط البديلة (إذا لم يكن التصحيح الفوري ممكناً):
1. تنفيذ تقسيم الشبكة لعزل الأنظمة المتأثرة
2. نشر حماية نقطة النهاية مع قدرات التحليل السلوكي
3. مراقبة أنماط الوصول إلى الذاكرة المريبة
4. تقييد امتيازات المستخدم لمنع تصعيد الامتيازات
5. تعطيل تنفيذ JavaScript في Firefox إذا لم يكن مطلوباً للعمليات التجارية

قواعد الكشف:
1. مراقبة firefox.exe أو thunderbird.exe لإنشاء عمليات فرعية غير متوقعة
2. التنبيه على أنماط الوصول إلى الذاكرة غير الطبيعية
3. تتبع استدعاءات ReadableStream API في سجلات وحدة تحكم المتصفح
4. مراقبة الاتصالات الشبكية المريبة التي يبدأها المتصفح
5. تنفيذ قواعد EDR للكشف عن أنماط استغلال use-after-free
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information Security Policies and Procedures A.6.1.1 - Organization of Information Security A.8.1.1 - User Endpoint Devices A.8.2.1 - User Access Management A.12.2.1 - Restrictions on Software Installation A.12.6.1 - Management of Technical Vulnerabilities
🔵 SAMA CSF
ID.RA-1 - Asset Management PR.IP-12 - Software Development and Quality Assurance PR.PT-2 - Removable Media Protection DE.CM-8 - Vulnerability Scans RS.MI-2 - Incidents are mitigated
🟡 ISO 27001:2022
A.12.2.1 - Change management procedures A.12.6.1 - Management of technical vulnerabilities A.14.2.1 - Secure development policy A.14.2.5 - Secure development environment
🟣 PCI DSS v4.0
6.2 - Security patches and updates 6.3.1 - Vulnerability scanning 11.2.2 - Vulnerability scanning frequency
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Mozilla:Firefox and Thunderbird
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS5.00%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2022-05-03
Published 2021-11-03
Source Feed cisa_kev
Views 3
🇸🇦 Saudi Risk Score
9.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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