📄 Description (English)
Cisco IOS Software for Cisco Industrial Ethernet Switches PROFINET Denial-of-Service Vulnerability — A vulnerability in the implementation of the PROFINET Discovery and Configuration Protocol (PN-DCP) for Cisco IOS could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service.
🤖 AI Executive Summary
CVE-2017-12235 is a critical denial-of-service vulnerability in Cisco IOS Software affecting Cisco Industrial Ethernet Switches through the PROFINET Discovery and Configuration Protocol (PN-DCP). An unauthenticated remote attacker can cause the affected device to reload, disrupting network operations. With a CVSS score of 9.0 and known exploits available, this vulnerability poses a significant risk to industrial control system (ICS) environments. A patch is available from Cisco and should be applied immediately.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 7, 2026 22:34
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability critically impacts Saudi Arabia's industrial and energy sectors, particularly ARAMCO, SABIC, and other petrochemical facilities that rely on Cisco Industrial Ethernet Switches with PROFINET in their OT/ICS networks. Government-operated critical infrastructure managed by NCA-regulated entities, water treatment plants, and power generation facilities using these switches are also at high risk. Telecom providers (STC, Mobily, Zain) using Cisco industrial switches in their infrastructure could experience service disruptions. The vulnerability is especially dangerous in Saudi Arabia given the nation's heavy reliance on industrial automation in the oil and gas sector.
🏢 Affected Saudi Sectors
Energy
Oil & Gas
Government
Manufacturing
Telecommunications
Water & Utilities
Transportation
⚖️ Saudi Risk Score (AI)
9.0
/ 10.0
🔧 Remediation Steps (English)
1. IMMEDIATE ACTIONS:
- Identify all Cisco Industrial Ethernet Switches running affected IOS versions in your environment
- Implement network segmentation to isolate PROFINET-enabled devices from untrusted networks
- Apply ACLs to restrict PN-DCP traffic (UDP port 34964) to authorized sources only
2. PATCHING GUIDANCE:
- Apply the Cisco IOS security update referenced in Cisco Security Advisory cisco-sa-20170927-profinet
- Schedule maintenance windows for OT/ICS environments to minimize operational disruption
- Test patches in a staging environment before deploying to production ICS networks
3. COMPENSATING CONTROLS:
- Deploy IDS/IPS rules to detect malformed PN-DCP packets
- Enable PROFINET traffic monitoring and anomaly detection
- Implement network monitoring for unexpected device reloads
4. DETECTION RULES:
- Monitor for abnormal PN-DCP traffic patterns on industrial network segments
- Alert on unexpected Cisco switch reloads or crash dumps
- Implement Snort/Suricata rules for malformed PROFINET packets
🔧 خطوات المعالجة (العربية)
1. الإجراءات الفورية:
- تحديد جميع محولات Cisco Industrial Ethernet التي تعمل بإصدارات IOS المتأثرة في بيئتك
- تنفيذ تجزئة الشبكة لعزل الأجهزة المُمكّنة لبروتوكول PROFINET عن الشبكات غير الموثوقة
- تطبيق قوائم التحكم في الوصول لتقييد حركة PN-DCP (منفذ UDP 34964) للمصادر المصرح بها فقط
2. إرشادات التصحيح:
- تطبيق تحديث أمان Cisco IOS المشار إليه في تنبيه Cisco الأمني cisco-sa-20170927-profinet
- جدولة نوافذ الصيانة لبيئات OT/ICS لتقليل التعطيل التشغيلي
- اختبار التصحيحات في بيئة اختبار قبل النشر في شبكات ICS الإنتاجية
3. الضوابط التعويضية:
- نشر قواعد IDS/IPS للكشف عن حزم PN-DCP المشوهة
- تمكين مراقبة حركة PROFINET والكشف عن الشذوذ
- تنفيذ مراقبة الشبكة لإعادة تحميل الأجهزة غير المتوقعة
4. قواعد الكشف:
- مراقبة أنماط حركة PN-DCP غير الطبيعية على قطاعات الشبكة الصناعية
- التنبيه عند إعادة تحميل محولات Cisco غير المتوقعة أو تفريغات الأعطال
- تنفيذ قواعد Snort/Suricata لحزم PROFINET المشوهة
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC-2:3-1 (Network Security)
ECC-2:5-2 (Industrial Control Systems Security)
ECC-2:3-4 (Vulnerability Management)
ECC-2:4-1 (Incident Management)
🔵 SAMA CSF
3.3.3 (Network Security Management)
3.3.5 (Vulnerability Management)
3.4.1 (Incident Response)
3.3.7 (Infrastructure Security)
🟡 ISO 27001:2022
A.8.9 (Configuration Management)
A.8.8 (Management of Technical Vulnerabilities)
A.8.20 (Network Security)
A.8.22 (Segregation of Networks)
🟣 PCI DSS v4.0
6.3.3 (Patching Security Vulnerabilities)
11.3 (Vulnerability Scanning)
1.3 (Network Segmentation)
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Cisco:IOS software