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Vulnerabilities

CVE-2017-3881

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Cisco IOS and IOS XE Remote Code Execution Vulnerability — A vulnerability in the Cisco Cluster Management Protocol (CMP) processing code in Cisco IOS and Cisco IOS XE Software could allow an unauthen
Published: Mar 25, 2022  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Cisco IOS and IOS XE Remote Code Execution Vulnerability — A vulnerability in the Cisco Cluster Management Protocol (CMP) processing code in Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a reload of an affected device or remotely execute code with elevated privileges.

🤖 AI Executive Summary

CVE-2017-3881 is a critical remote code execution vulnerability in Cisco IOS and IOS XE Software's Cluster Management Protocol (CMP) processing code. An unauthenticated remote attacker can exploit this flaw via a specially crafted Telnet connection to cause a device reload (denial of service) or execute arbitrary code with elevated privileges. This vulnerability was disclosed as part of the Vault 7 CIA leaks and has known public exploits, making it extremely dangerous. With a CVSS score of 9.0, immediate patching is essential for all organizations running affected Cisco network infrastructure.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 8, 2026 09:17
🇸🇦 Saudi Arabia Impact Assessment
هذه الثغرة تشكل خطراً بالغاً على البنية التحتية السعودية نظراً للانتشار الواسع لأجهزة Cisco في جميع القطاعات الحيوية. القطاع المصرفي (البنوك الخاضعة لرقابة ساما) والقطاع الحكومي (الجهات المرتبطة بالهيئة الوطنية للأمن السيبراني) وقطاع الطاقة (أرامكو وشركات الطاقة) وقطاع الاتصالات (STC وزين وموبايلي) جميعها تعتمد بشكل كبير على محولات وموجهات Cisco. استغلال هذه الثغرة يمكن أن يؤدي إلى تعطيل الشبكات الحرجة أو اختراقها بالكامل، مما يهدد الأمن الوطني والاستقرار الاقتصادي.
🏢 Affected Saudi Sectors
Banking Government Energy Telecommunications Healthcare Defense Education Transportation Retail
⚖️ Saudi Risk Score (AI)
9.5
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Disable Telnet on all Cisco IOS/IOS XE devices and switch to SSH for remote management immediately.
2. If Telnet cannot be disabled, apply ACLs to restrict Telnet access to trusted management IP addresses only.
3. Disable the CMP subsystem if not required using 'no service cluster' command where supported.

Patching Guidance:
4. Apply Cisco's official security patches — refer to Cisco Security Advisory cisco-sa-20170317-cmp for specific fixed software versions.
5. Prioritize patching internet-facing and DMZ switches/routers first, then internal infrastructure.
6. Verify patch application using 'show version' command.

Compensating Controls:
7. Implement network segmentation to limit lateral movement if a device is compromised.
8. Deploy IDS/IPS signatures to detect CMP exploitation attempts (Snort SIDs available from Cisco).
9. Monitor for unusual Telnet traffic patterns and unexpected device reloads.

Detection Rules:
10. Alert on any Telnet connections to network infrastructure devices from non-management subnets.
11. Monitor syslog for unexpected reload events or CMP-related error messages.
12. Implement NetFlow analysis to detect anomalous traffic to TCP port 23 on infrastructure devices.
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تعطيل بروتوكول Telnet على جميع أجهزة Cisco IOS/IOS XE والتحول إلى SSH للإدارة عن بُعد فوراً.
2. إذا تعذر تعطيل Telnet، تطبيق قوائم التحكم بالوصول (ACL) لتقييد الوصول عبر Telnet لعناوين IP الإدارية الموثوقة فقط.
3. تعطيل نظام CMP الفرعي إذا لم يكن مطلوباً باستخدام أمر 'no service cluster' حيثما أمكن.

إرشادات التصحيح:
4. تطبيق تصحيحات Cisco الأمنية الرسمية — الرجوع إلى نشرة Cisco الأمنية cisco-sa-20170317-cmp للحصول على إصدارات البرامج المصححة.
5. إعطاء الأولوية لتصحيح المحولات والموجهات المواجهة للإنترنت ومنطقة DMZ أولاً، ثم البنية التحتية الداخلية.
6. التحقق من تطبيق التصحيح باستخدام أمر 'show version'.

الضوابط التعويضية:
7. تنفيذ تجزئة الشبكة للحد من الحركة الجانبية في حالة اختراق جهاز.
8. نشر توقيعات IDS/IPS للكشف عن محاولات استغلال CMP.
9. مراقبة أنماط حركة Telnet غير المعتادة وإعادة التشغيل غير المتوقعة للأجهزة.

قواعد الكشف:
10. إنشاء تنبيهات لأي اتصالات Telnet بأجهزة البنية التحتية من شبكات فرعية غير إدارية.
11. مراقبة سجلات النظام لأحداث إعادة التشغيل غير المتوقعة أو رسائل خطأ CMP.
12. تنفيذ تحليل NetFlow للكشف عن حركة المرور الشاذة إلى منفذ TCP 23 على أجهزة البنية التحتية.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2-3-1 (Network Security) ECC 2-3-4 (Secure Configuration Management) ECC 2-5-1 (Vulnerability Management) ECC 2-6-1 (Security Monitoring and Event Management) ECC 2-2-1 (Asset Management)
🔵 SAMA CSF
3.3.3 (Network Security Management) 3.3.4 (Secure Configuration) 3.3.7 (Vulnerability Management) 3.4.1 (Security Event Monitoring) 3.3.1 (Infrastructure Security)
🟡 ISO 27001:2022
A.8.9 (Configuration Management) A.8.8 (Management of Technical Vulnerabilities) A.8.20 (Networks Security) A.8.21 (Security of Network Services) A.8.16 (Monitoring Activities)
🟣 PCI DSS v4.0
Requirement 1 (Install and maintain network security controls) Requirement 2 (Apply secure configurations to all system components) Requirement 6.3.3 (Patch critical vulnerabilities within one month) Requirement 11.4 (External and internal penetration testing)
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Cisco:IOS and IOS XE
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS94.28%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2022-04-15
Published 2022-03-25
Source Feed cisa_kev
Views 1
🇸🇦 Saudi Risk Score
9.5
/ 10.0 — Saudi Risk
🏷️ Tags
kev actively-exploited
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