📄 Description (English)
Cisco IOS Software for Cisco Integrated Services Routers Denial-of-Service Vulnerability — A vulnerability in the implementation of a protocol in Cisco Integrated Services Routers Generation 2 (ISR G2) Routers running Cisco IOS could allow an unauthenticated, adjacent attacker to cause an affected device to reload, resulting in a denial of service.
🤖 AI Executive Summary
CVE-2017-12232 is a critical denial-of-service vulnerability in Cisco IOS Software running on Cisco Integrated Services Routers Generation 2 (ISR G2). An unauthenticated, adjacent attacker can exploit this vulnerability to cause the affected device to reload, resulting in a complete denial of service. A public exploit is available, increasing the risk of active exploitation. While this is a 2017 vulnerability, unpatched Cisco ISR G2 routers remain prevalent in many enterprise and government networks.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 7, 2026 20:33
🇸🇦 Saudi Arabia Impact Assessment
Cisco ISR G2 routers are widely deployed across Saudi Arabia in government agencies, banking institutions regulated by SAMA, telecommunications providers like STC/Mobily/Zain, energy sector organizations including ARAMCO and SEC, and healthcare facilities. This DoS vulnerability could disrupt critical network infrastructure, branch office connectivity, and WAN links. Government entities under NCA oversight and financial institutions are particularly at risk given their reliance on Cisco routing infrastructure. The adjacent attack vector limits remote exploitation but insider threats and compromised network segments remain a concern in large Saudi enterprise environments.
🏢 Affected Saudi Sectors
Government
Banking
Telecommunications
Energy
Healthcare
Education
Retail
⚖️ Saudi Risk Score (AI)
7.5
/ 10.0
🔧 Remediation Steps (English)
1. IMMEDIATE ACTIONS:
- Identify all Cisco ISR G2 routers in your network inventory
- Verify current IOS versions against Cisco's advisory (cisco-sa-20170927-ios-ios-xe)
- Implement network segmentation to limit adjacent network access to router management interfaces
2. PATCHING GUIDANCE:
- Apply the Cisco IOS software update as specified in Cisco Security Advisory cisco-sa-20170927-ios-ios-xe
- Schedule maintenance windows for router upgrades, prioritizing internet-facing and critical infrastructure routers
- Test patches in a lab environment before production deployment
3. COMPENSATING CONTROLS:
- Enable Control Plane Policing (CoPP) to rate-limit protocol traffic to the router
- Implement 802.1X or MAC-based port security to restrict unauthorized adjacent access
- Configure infrastructure ACLs to limit access to router interfaces
- Enable logging and SNMP traps for unexpected device reloads
4. DETECTION RULES:
- Monitor for unexpected router reloads via syslog (RELOAD messages)
- Set up SNMP monitoring for device uptime resets
- Deploy network anomaly detection for unusual Layer 2 protocol traffic patterns
- Review Cisco IOS crash dump files for exploitation indicators
🔧 خطوات المعالجة (العربية)
1. الإجراءات الفورية:
- تحديد جميع أجهزة التوجيه Cisco ISR G2 في جرد الشبكة
- التحقق من إصدارات IOS الحالية مقابل تحذير Cisco (cisco-sa-20170927-ios-ios-xe)
- تطبيق تجزئة الشبكة للحد من الوصول المجاور إلى واجهات إدارة أجهزة التوجيه
2. إرشادات التحديث:
- تطبيق تحديث برنامج Cisco IOS وفقاً لتحذير Cisco الأمني
- جدولة نوافذ صيانة لترقية أجهزة التوجيه مع إعطاء الأولوية للأجهزة الحرجة
- اختبار التحديثات في بيئة معملية قبل النشر في بيئة الإنتاج
3. الضوابط التعويضية:
- تفعيل سياسة حماية مستوى التحكم (CoPP) للحد من حركة البروتوكول
- تطبيق 802.1X أو أمان المنافذ القائم على MAC لتقييد الوصول المجاور غير المصرح به
- تكوين قوائم التحكم في الوصول للبنية التحتية
- تفعيل التسجيل وتنبيهات SNMP لإعادة التشغيل غير المتوقعة
4. قواعد الكشف:
- مراقبة إعادة التشغيل غير المتوقعة عبر سجلات النظام
- إعداد مراقبة SNMP لإعادة تعيين وقت تشغيل الجهاز
- نشر كشف الشذوذ في الشبكة لأنماط حركة البروتوكول غير العادية
- مراجعة ملفات تفريغ الأعطال للكشف عن مؤشرات الاستغلال
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC-2:3-1 (Network Security)
ECC-2:5-2 (Vulnerability Management)
ECC-2:3-4 (Infrastructure Protection)
ECC-2:4-1 (Incident Management)
🔵 SAMA CSF
3.3.3 (Network Security Management)
3.3.4 (Patch Management)
3.3.7 (Infrastructure Security)
3.4.1 (Incident Detection and Response)
🟡 ISO 27001:2022
A.8.8 (Management of technical vulnerabilities)
A.8.20 (Networks security)
A.8.21 (Security of network services)
A.8.9 (Configuration management)
🟣 PCI DSS v4.0
6.3.3 (Install applicable security patches)
11.3 (External and internal penetration testing)
1.2 (Network security controls)
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Cisco:IOS software