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Vulnerabilities

CVE-2020-5135

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
SonicWall SonicOS Buffer Overflow Vulnerability — A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending
Published: Mar 15, 2022  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

SonicWall SonicOS Buffer Overflow Vulnerability — A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall.

🤖 AI Executive Summary

CVE-2020-5135 is a critical buffer overflow vulnerability in SonicWall SonicOS firewalls with a CVSS score of 9.0, allowing remote attackers to execute arbitrary code or cause denial of service without authentication. This vulnerability poses an immediate threat to organizations relying on SonicWall firewalls for network perimeter defense. Exploitation is actively occurring in the wild, making immediate patching essential for all affected deployments.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 19, 2026 11:49
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability critically impacts Saudi organizations across multiple sectors: Banking and financial institutions (SAMA-regulated) relying on SonicWall firewalls for network security face potential compromise of customer data and transaction systems; Government agencies (NCA oversight) using SonicOS for critical infrastructure protection are at risk of network infiltration; Energy sector (ARAMCO and related entities) dependent on SonicWall for operational technology network segmentation; Telecommunications providers (STC, Mobily) using SonicOS for carrier-grade security; Healthcare institutions managing patient data through SonicWall-protected networks. The remote, unauthenticated nature of exploitation makes this particularly dangerous for Saudi organizations with internet-facing SonicWall deployments.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Energy and Utilities Telecommunications Healthcare Critical Infrastructure Large Enterprises
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all SonicWall SonicOS deployments in your environment and document firmware versions
2. Isolate or restrict external access to affected SonicWall devices immediately as a temporary measure
3. Enable enhanced logging and monitoring on all SonicWall firewalls for suspicious connection attempts

PATCHING GUIDANCE:
1. Apply SonicWall security patches immediately (firmware versions 6.5.4.6, 6.5.4.7, 6.6.0.5, 6.6.1.2, 6.7.0.1 or later)
2. Test patches in non-production environment first, then deploy to production with change management approval
3. Schedule patching during maintenance windows with minimal business impact
4. Verify patch installation by confirming firmware version post-update

COMPENSATING CONTROLS (if patching delayed):
1. Implement network segmentation to limit direct internet access to SonicWall management interfaces
2. Deploy intrusion detection/prevention systems (IDS/IPS) to detect buffer overflow exploitation attempts
3. Restrict administrative access to SonicWall devices to authorized personnel only
4. Monitor firewall logs for unusual traffic patterns or connection attempts

DETECTION RULES:
1. Monitor for HTTP requests with abnormally large payloads to SonicWall web interface
2. Alert on unexpected process execution or memory corruption events on SonicWall devices
3. Track failed authentication attempts followed by suspicious network activity
4. Implement YARA rules to detect known exploit signatures in network traffic
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حدد جميع نشرات SonicWall SonicOS في بيئتك وقم بتوثيق إصدارات البرامج الثابتة
2. عزل أو تقييد الوصول الخارجي إلى أجهزة SonicWall المتأثرة فوراً كإجراء مؤقت
3. تفعيل السجلات المحسنة والمراقبة على جميع جدران حماية SonicWall للكشف عن محاولات الاتصال المريبة

إرشادات التصحيح:
1. تطبيق تصحيحات أمان SonicWall فوراً (إصدارات البرامج الثابتة 6.5.4.6 أو 6.5.4.7 أو 6.6.0.5 أو 6.6.1.2 أو 6.7.0.1 أو أحدث)
2. اختبر التصحيحات في بيئة غير الإنتاج أولاً، ثم انشرها في الإنتاج مع موافقة إدارة التغيير
3. جدولة التصحيح خلال نوافذ الصيانة بأقل تأثير على الأعمال
4. تحقق من تثبيت التصحيح بتأكيد إصدار البرنامج الثابت بعد التحديث

الضوابط البديلة (إذا تأخر التصحيح):
1. تنفيذ تقسيم الشبكة لتحديد الوصول المباشر للإنترنت إلى واجهات إدارة SonicWall
2. نشر أنظمة كشف/منع الاختراق (IDS/IPS) للكشف عن محاولات استغلال تجاوز المخزن المؤقت
3. تقييد الوصول الإداري إلى أجهزة SonicWall للموظفين المصرح لهم فقط
4. مراقبة سجلات جدار الحماية للكشف عن أنماط حركة المرور غير العادية

قواعد الكشف:
1. مراقبة طلبات HTTP بأحمال حمولة كبيرة بشكل غير طبيعي لواجهة ويب SonicWall
2. تنبيه عند تنفيذ عملية غير متوقعة أو أحداث تلف الذاكرة على أجهزة SonicWall
3. تتبع محاولات المصادقة الفاشلة متبوعة بنشاط شبكة مريب
4. تنفيذ قواعد YARA للكشف عن توقيعات الاستغلال المعروفة في حركة المرور على الشبكة
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.12.6.1 - Management of technical vulnerabilities ECC 2024 A.12.2.1 - Change management procedures ECC 2024 A.13.1.1 - Network security perimeter ECC 2024 A.14.2.1 - Security incident management
🔵 SAMA CSF
SAMA CSF ID.RA-1 - Asset management and vulnerability identification SAMA CSF PR.IP-12 - Security patch management SAMA CSF DE.CM-1 - Detection and monitoring of anomalies SAMA CSF RS.RP-1 - Response planning and procedures
🟡 ISO 27001:2022
ISO 27001:2022 A.12.3.1 - Configuration management ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities ISO 27001:2022 A.14.2.1 - Security incident management ISO 27001:2022 A.8.1.1 - Inventory of assets
🟣 PCI DSS v4.0
PCI DSS 6.2 - Security patches for system components PCI DSS 11.2 - Vulnerability scanning and management PCI DSS 12.2 - Configuration standards for system components
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
SonicWall:SonicOS
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS24.99%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2022-04-05
Published 2022-03-15
Source Feed cisa_kev
Views 1
🇸🇦 Saudi Risk Score
9.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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