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Vulnerabilities

CVE-2021-25296

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Nagios XI OS Command Injection — Nagios XI contains a vulnerability which can lead to OS command injection on the Nagios XI server.
Published: Jan 18, 2022  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Nagios XI OS Command Injection — Nagios XI contains a vulnerability which can lead to OS command injection on the Nagios XI server.

🤖 AI Executive Summary

Nagios XI contains a critical OS command injection vulnerability (CVSS 9.0) allowing unauthenticated attackers to execute arbitrary commands on the monitoring server. This vulnerability poses severe risk to Saudi organizations relying on Nagios XI for infrastructure monitoring, potentially compromising the entire monitoring and alerting infrastructure. Immediate patching is essential as exploits are publicly available.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 20, 2026 03:56
🇸🇦 Saudi Arabia Impact Assessment
Critical impact on Saudi government agencies (NCA, NCSC), ARAMCO and energy sector infrastructure monitoring, banking sector (SAMA-regulated institutions), telecommunications (STC, Mobily), and healthcare facilities using Nagios XI. Compromise of monitoring infrastructure could mask attacks on critical systems, prevent incident detection, and enable lateral movement across monitored networks. Government and critical infrastructure sectors face highest risk due to reliance on centralized monitoring.
🏢 Affected Saudi Sectors
Government (NCA, NCSC, ministries) Energy (ARAMCO, power utilities) Banking (SAMA-regulated institutions) Telecommunications (STC, Mobily, Zain) Healthcare (MOH facilities) Critical Infrastructure Large Enterprises with centralized monitoring
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Nagios XI instances in your environment using network scanning and asset inventory
2. Restrict network access to Nagios XI web interface to authorized IPs only via firewall rules
3. Disable or restrict API endpoints if not required for operations
4. Review access logs for suspicious activity patterns (command injection attempts, unusual API calls)

PATCHING:
1. Apply latest Nagios XI security patches immediately (version 5.8.1 or later)
2. Test patches in non-production environment first
3. Schedule maintenance window for production deployment
4. Verify patch installation by checking version and reviewing security advisories

COMPENSATING CONTROLS (if patching delayed):
1. Implement Web Application Firewall (WAF) rules to detect/block command injection patterns
2. Deploy IDS/IPS signatures for Nagios XI exploitation attempts
3. Run Nagios XI in isolated network segment with minimal trust relationships
4. Implement strict input validation at application level
5. Monitor for suspicious process execution from Nagios XI process

DETECTION:
1. Monitor for HTTP requests containing shell metacharacters (;, |, &, $, backticks) to Nagios XI endpoints
2. Alert on unexpected child processes spawned by Nagios XI daemon
3. Monitor system logs for command execution from nagios user context
4. Track failed authentication attempts and API abuse patterns
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع نسخ Nagios XI في بيئتك باستخدام المسح الشبكي وجرد الأصول
2. تقييد الوصول الشبكي إلى واجهة ويب Nagios XI للعناوين المصرح بها فقط عبر قواعد جدار الحماية
3. تعطيل أو تقييد نقاط نهاية API إذا لم تكن مطلوبة للعمليات
4. مراجعة سجلات الوصول للأنشطة المريبة (محاولات حقن الأوامر، استدعاءات API غير العادية)

التصحيح:
1. تطبيق أحدث تصحيحات أمان Nagios XI فوراً (الإصدار 5.8.1 أو أحدث)
2. اختبار التصحيحات في بيئة غير الإنتاج أولاً
3. جدولة نافذة صيانة لنشر الإنتاج
4. التحقق من تثبيت التصحيح بفحص الإصدار ومراجعة التنبيهات الأمنية

الضوابط البديلة (إذا تأخر التصحيح):
1. تنفيذ قواعد جدار تطبيقات الويب (WAF) للكشف عن أنماط حقن الأوامر وحجبها
2. نشر توقيعات IDS/IPS لمحاولات استغلال Nagios XI
3. تشغيل Nagios XI في قطاع شبكة معزول مع علاقات ثقة دنيا
4. تنفيذ التحقق الصارم من المدخلات على مستوى التطبيق
5. مراقبة تنفيذ العمليات غير المتوقعة من عملية Nagios XI

الكشف:
1. مراقبة طلبات HTTP التي تحتوي على أحرف shell (;، |، &، $، علامات الاقتباس العكسية) لنقاط نهاية Nagios XI
2. التنبيه على العمليات الفرعية غير المتوقعة التي يتم إنشاؤها بواسطة daemon Nagios XI
3. مراقبة سجلات النظام لتنفيذ الأوامر من سياق مستخدم nagios
4. تتبع محاولات المصادقة الفاشلة وأنماط إساءة استخدام API
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.12.6.1 - Management of technical vulnerabilities ECC 2024 A.14.2.1 - Secure development policy ECC 2024 A.12.2.1 - Monitoring and logging ECC 2024 A.13.1.1 - Network security perimeter
🔵 SAMA CSF
SAMA CSF ID.BE-5 - Organizational resilience SAMA CSF PR.DS-6 - Data is protected from unauthorized access SAMA CSF DE.CM-1 - The network is monitored to detect potential cybersecurity events SAMA CSF RS.MI-2 - Incidents are mitigated
🟡 ISO 27001:2022
ISO 27001:2022 A.12.2.1 - Monitoring ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities ISO 27001:2022 A.14.2.1 - Secure development policy ISO 27001:2022 A.13.1.1 - Network security perimeter
🟣 PCI DSS v4.0
PCI DSS 6.2 - Security patches must be installed within defined timeframe PCI DSS 11.2 - Vulnerability scanning required PCI DSS 10.2 - Logging and monitoring of access
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Nagios:Nagios XI
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS93.56%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2022-02-01
Published 2022-01-18
Source Feed cisa_kev
Views 4
🇸🇦 Saudi Risk Score
9.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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