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Global data_breach Multiple sectors HIGH 58m Global vulnerability Government and Critical Infrastructure CRITICAL 1h Global vulnerability Multiple sectors CRITICAL 1h Global apt Financial Services, Government HIGH 1h Global insider Cross-sector CRITICAL 2h Global vulnerability Multiple sectors CRITICAL 2h Global vulnerability Information Technology / Software Infrastructure CRITICAL 2h Global data_breach Healthcare CRITICAL 2h Global malware Financial Services HIGH 2h Global vulnerability Technology/Software Development HIGH 3h Global data_breach Multiple sectors HIGH 58m Global vulnerability Government and Critical Infrastructure CRITICAL 1h Global vulnerability Multiple sectors CRITICAL 1h Global apt Financial Services, Government HIGH 1h Global insider Cross-sector CRITICAL 2h Global vulnerability Multiple sectors CRITICAL 2h Global vulnerability Information Technology / Software Infrastructure CRITICAL 2h Global data_breach Healthcare CRITICAL 2h Global malware Financial Services HIGH 2h Global vulnerability Technology/Software Development HIGH 3h Global data_breach Multiple sectors HIGH 58m Global vulnerability Government and Critical Infrastructure CRITICAL 1h Global vulnerability Multiple sectors CRITICAL 1h Global apt Financial Services, Government HIGH 1h Global insider Cross-sector CRITICAL 2h Global vulnerability Multiple sectors CRITICAL 2h Global vulnerability Information Technology / Software Infrastructure CRITICAL 2h Global data_breach Healthcare CRITICAL 2h Global malware Financial Services HIGH 2h Global vulnerability Technology/Software Development HIGH 3h
Vulnerabilities

CVE-2021-20090

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Arcadyan Buffalo Firmware Path Traversal Vulnerability — Arcadyan Buffalo firmware contains a path traversal vulnerability that could allow unauthenticated, remote attackers to bypass authentication a
Published: Nov 3, 2021  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Arcadyan Buffalo Firmware Path Traversal Vulnerability — Arcadyan Buffalo firmware contains a path traversal vulnerability that could allow unauthenticated, remote attackers to bypass authentication and access sensitive information. This vulnerability affects multiple routers across several different vendors.

🤖 AI Executive Summary

A critical path traversal vulnerability (CVE-2021-20090) in Arcadyan Buffalo firmware allows unauthenticated remote attackers to bypass authentication and access sensitive information on affected routers. With a CVSS score of 9.0 and publicly available exploits, this poses an immediate threat to Saudi organizations relying on these devices for network access. Urgent patching and network segmentation are required to prevent unauthorized access to critical infrastructure.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 19, 2026 22:56
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses severe risk to Saudi telecommunications sector (STC, Mobily, Zain), government agencies (NCA, CITC), and banking institutions (SAMA-regulated banks) that deploy Arcadyan Buffalo routers for network infrastructure. ISPs and enterprise networks are particularly vulnerable due to widespread router deployment. Compromised routers could enable lateral movement into critical systems, data exfiltration, and network reconnaissance. Healthcare facilities and energy sector organizations (ARAMCO, SEC) using these devices face operational disruption and data breach risks.
🏢 Affected Saudi Sectors
Telecommunications (STC, Mobily, Zain) Banking and Financial Services (SAMA-regulated) Government and Public Administration (NCA, CITC) Energy and Utilities (ARAMCO, SEC) Healthcare Internet Service Providers Enterprise Networks
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Arcadyan Buffalo routers in your network using asset inventory and network scanning tools
2. Isolate affected routers from critical systems using network segmentation and VLANs
3. Implement access controls restricting router management to authorized personnel only
4. Enable logging and monitoring on all router access attempts

PATCHING:
1. Apply latest firmware patches from Arcadyan/Buffalo immediately
2. Verify patch deployment across all affected devices
3. Test patches in non-production environment first
4. Document patch application dates and versions

COMPENSATING CONTROLS (if patching delayed):
1. Implement network-based access controls blocking unauthorized router access
2. Deploy WAF/IPS rules to detect path traversal attempts
3. Restrict router management interfaces to specific IP ranges
4. Disable remote management features if not required
5. Implement strong authentication on router admin accounts

DETECTION:
1. Monitor for HTTP requests containing '../' or encoded path traversal patterns
2. Alert on unauthorized access to router configuration files
3. Track failed authentication attempts followed by successful access
4. Monitor for unusual outbound connections from router IP addresses
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة التوجيه Arcadyan Buffalo في شبكتك باستخدام أدوات جرد الأصول وفحص الشبكة
2. عزل أجهزة التوجيه المتأثرة عن الأنظمة الحرجة باستخدام تقسيم الشبكة و VLANs
3. تطبيق عناصر التحكم في الوصول لتقييد إدارة التوجيه للموظفين المصرحين فقط
4. تفعيل التسجيل والمراقبة على جميع محاولات الوصول إلى التوجيه

التصحيح:
1. تطبيق أحدث تصحيحات البرنامج الثابت من Arcadyan/Buffalo فوراً
2. التحقق من نشر التصحيح عبر جميع الأجهزة المتأثرة
3. اختبار التصحيحات في بيئة غير الإنتاج أولاً
4. توثيق تواريخ وإصدارات تطبيق التصحيح

عناصر التحكم البديلة (إذا تأخر التصحيح):
1. تطبيق عناصر التحكم في الوصول المستندة إلى الشبكة لحظر الوصول غير المصرح إلى التوجيه
2. نشر قواعد WAF/IPS للكشف عن محاولات تجاوز المسار
3. تقييد واجهات إدارة التوجيه على نطاقات IP محددة
4. تعطيل ميزات الإدارة البعيدة إذا لم تكن مطلوبة
5. تطبيق المصادقة القوية على حسابات مسؤول التوجيه

الكشف:
1. مراقبة طلبات HTTP التي تحتوي على '../' أو أنماط تجاوز المسار المشفرة
2. التنبيه على الوصول غير المصرح إلى ملفات تكوين التوجيه
3. تتبع محاولات المصادقة الفاشلة متبوعة بالوصول الناجح
4. مراقبة الاتصالات الخارجية غير العادية من عناوين IP للتوجيه
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information Security Policies and Procedures A.6.1.1 - Organization of Information Security A.8.1.1 - Asset Management A.13.1.1 - Network Security Management A.14.1.1 - Incident Management
🔵 SAMA CSF
Identify - Asset Management (ID.AM) Protect - Access Control (PR.AC) Protect - Data Security (PR.DS) Detect - Anomalies and Events (DE.AE) Respond - Response Planning (RS.RP)
🟡 ISO 27001:2022
A.5.1 - Management Direction A.8.1 - Asset Management A.9.1 - Access Control A.12.6 - Management of Technical Vulnerabilities A.16.1 - Information Security Incident Management
🟣 PCI DSS v4.0
Requirement 1.1 - Firewall Configuration Standards Requirement 2.1 - Default Passwords and Security Parameters Requirement 6.2 - Security Patches and Updates Requirement 11.2 - Vulnerability Scanning
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Arcadyan:Buffalo Firmware
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS94.40%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2021-11-17
Published 2021-11-03
Source Feed cisa_kev
Views 1
🇸🇦 Saudi Risk Score
9.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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