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Vulnerabilities

CVE-2026-22925

High
CWE-770 — Weakness Type
Published: May 12, 2026  ·  Modified: May 19, 2026  ·  Source: NVD
CVSS v3
7.5
🔗 NVD Official
📄 Description (English)

A vulnerability has been identified in SIMATIC CN 4100 (All versions < V5.0). The affected application is susceptible to resource exhaustion when subjected to high volume of TCP SYN packets
This could allow an attacker to render the service unavailable and cause denial-of-service conditions by overwhelming system resources.

🤖 AI Executive Summary

CVE-2026-22925 is a resource exhaustion vulnerability in SIMATIC CN 4100 industrial control systems affecting all versions below V5.0. The vulnerability allows attackers to trigger denial-of-service conditions through TCP SYN flood attacks, potentially disrupting critical industrial operations. With a CVSS score of 7.5 and no available patch, immediate compensating controls are essential for affected Saudi organizations.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 15, 2026 08:32
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi critical infrastructure sectors: Energy (ARAMCO, refineries, power generation facilities), Water and Wastewater (SWCC), Petrochemical industries, and Manufacturing. SIMATIC CN 4100 devices are commonly deployed in industrial automation and SCADA environments. Exploitation could disrupt production lines, compromise operational technology networks, and impact national economic output. Government entities managing critical infrastructure and telecommunications providers (STC, Mobily) using these systems for network management are also at risk.
🏢 Affected Saudi Sectors
Energy and Utilities (ARAMCO, power generation, refineries) Water and Wastewater Management (SWCC) Petrochemical Manufacturing Government and Critical Infrastructure Telecommunications (STC, Mobily) Industrial Manufacturing and Automation
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Inventory all SIMATIC CN 4100 devices in your environment and document current firmware versions
2. Isolate affected systems from untrusted networks and implement network segmentation
3. Deploy TCP SYN flood protection mechanisms (SYN cookies, rate limiting)
4. Implement network-based DDoS mitigation at perimeter firewalls

Compensating Controls:
5. Configure stateful firewalls to limit TCP connection rates and implement connection timeouts
6. Deploy intrusion detection/prevention systems (IDS/IPS) with rules to detect SYN flood patterns
7. Implement rate limiting on TCP SYN packets (e.g., limit to 100 SYN packets/second per source)
8. Enable TCP connection tracking and implement aggressive timeout settings
9. Consider deploying DDoS mitigation appliances or cloud-based DDoS protection services
10. Monitor system resource utilization (CPU, memory, network bandwidth) for anomalies

Patching Strategy:
11. Plan immediate upgrade to V5.0 or later when available
12. Test patches in isolated lab environment before production deployment
13. Coordinate with Siemens for security advisories and patch timelines

Detection Rules:
14. Monitor for excessive TCP SYN packets from single source IPs
15. Alert on sustained connection attempts exceeding baseline thresholds
16. Track system resource exhaustion events in CN 4100 logs
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. قم بحصر جميع أجهزة SIMATIC CN 4100 في بيئتك وتوثيق إصدارات البرامج الثابتة الحالية
2. عزل الأنظمة المتأثرة عن الشبكات غير الموثوقة وتنفيذ تقسيم الشبكة
3. نشر آليات حماية فيضان TCP SYN (ملفات تعريف الارتباط، تحديد المعدل)
4. تنفيذ تخفيف DDoS على مستوى جدران الحماية المحيطة

الضوابط التعويضية:
5. تكوين جدران الحماية ذات الحالة لتحديد معدلات اتصال TCP وتنفيذ انتهاء الاتصال
6. نشر أنظمة كشف/منع الاختراق مع قواعد للكشف عن أنماط فيضان SYN
7. تنفيذ تحديد المعدل على حزم TCP SYN (على سبيل المثال، تحديد 100 حزمة SYN/ثانية لكل مصدر)
8. تفعيل تتبع اتصال TCP وتنفيذ إعدادات انتهاء الصلاحية العدوانية
9. النظر في نشر أجهزة تخفيف DDoS أو خدمات حماية DDoS المستندة إلى السحابة
10. مراقبة استخدام موارد النظام (CPU والذاكرة وعرض النطاق الترددي للشبكة) للكشف عن الشذوذ

استراتيجية التصحيح:
11. التخطيط للترقية الفورية إلى V5.0 أو إصدار أحدث عند توفره
12. اختبار التصحيحات في بيئة معملية معزولة قبل نشر الإنتاج
13. التنسيق مع Siemens للحصول على التنبيهات الأمنية والجداول الزمنية للتصحيح

قواعد الكشف:
14. مراقبة حزم TCP SYN المفرطة من عناوين IP مصدر واحدة
15. تنبيه محاولات الاتصال المستمرة التي تتجاوز خطوط الأساس
16. تتبع أحداث استنزاف موارد النظام في سجلات CN 4100
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 - 5.1.1: Information Security Policies and Procedures ECC 2024 - 5.2.1: Access Control and Authentication ECC 2024 - 5.3.1: Cryptography and Data Protection ECC 2024 - 5.4.1: System and Network Security ECC 2024 - 5.5.1: Incident Management and Response
🔵 SAMA CSF
SAMA CSF - Governance: Risk Management Framework SAMA CSF - Protect: System and Network Security SAMA CSF - Detect: Monitoring and Anomaly Detection SAMA CSF - Respond: Incident Response Procedures
🟡 ISO 27001:2022
ISO 27001:2022 - A.5.1: Policies for information security ISO 27001:2022 - A.8.1: User endpoint devices ISO 27001:2022 - A.8.2: Privileged access rights ISO 27001:2022 - A.8.3: Information access restriction ISO 27001:2022 - A.13.1: Network security ISO 27001:2022 - A.13.2: Information transfer
📊 CVSS Score
7.5
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityN — None / Network
IntegrityN — None / Network
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score7.5
CWECWE-770
EPSS0.05%
Exploit No
Patch ✗ No
Published 2026-05-12
Source Feed nvd
🇸🇦 Saudi Risk Score
8.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
CWE-770
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