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Vulnerabilities

CVE-2021-40655

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
D-Link DIR-605 Router Information Disclosure Vulnerability — D-Link DIR-605 routers contain an information disclosure vulnerability that allows attackers to obtain a username and password by forging a
Published: May 16, 2024  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

D-Link DIR-605 Router Information Disclosure Vulnerability — D-Link DIR-605 routers contain an information disclosure vulnerability that allows attackers to obtain a username and password by forging a post request to the /getcfg.php page.

🤖 AI Executive Summary

D-Link DIR-605 routers contain a critical information disclosure vulnerability (CVE-2021-40655) allowing attackers to extract administrative credentials through forged POST requests to /getcfg.php. With a CVSS score of 9.0 and publicly available exploits, this vulnerability poses an immediate threat to organizations using these routers for network access control. Patching is urgent as compromised router credentials enable lateral movement and network compromise.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 21, 2026 09:14
🇸🇦 Saudi Arabia Impact Assessment
Saudi organizations across multiple sectors face significant risk: Telecom operators (STC, Mobily, Zain) using DIR-605 for network infrastructure; Banking sector (SAMA-regulated institutions) with routers in branch offices or data centers; Government agencies (NCA, NCSC oversight) relying on these devices for network perimeter security; Healthcare facilities managing patient data networks; Energy sector (ARAMCO, utilities) with operational technology networks. Compromised router credentials enable attackers to intercept encrypted traffic, establish persistent backdoors, and pivot into critical internal systems.
🏢 Affected Saudi Sectors
Telecommunications (STC, Mobily, Zain) Banking and Financial Services (SAMA-regulated) Government and Public Administration (NCA, NCSC) Healthcare Energy and Utilities (ARAMCO, regional utilities) Retail and E-commerce Education Small and Medium Enterprises (SMEs)
⚖️ Saudi Risk Score (AI)
8.8
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all D-Link DIR-605 routers in your network using asset discovery tools
2. Isolate affected routers from production networks if patches cannot be applied immediately
3. Change all administrative credentials on DIR-605 devices to complex passwords (minimum 16 characters)
4. Disable remote management access and restrict admin access to trusted IP ranges only
5. Monitor router logs for suspicious POST requests to /getcfg.php

PATCHING:
1. Download latest firmware from D-Link support portal (verify digital signatures)
2. Apply patches during maintenance windows with change management approval
3. Test patches in lab environment before production deployment
4. Document patch deployment across all affected devices

COMPENSATING CONTROLS:
1. Implement network segmentation isolating router management interfaces
2. Deploy WAF/IPS rules blocking POST requests to /getcfg.php from untrusted sources
3. Enable router authentication logging and forward logs to SIEM
4. Implement network access control (NAC) to restrict router access
5. Deploy intrusion detection signatures for CVE-2021-40655 exploitation attempts

DETECTION:
1. Monitor for POST requests to /getcfg.php in web server logs
2. Alert on failed authentication attempts to router management interfaces
3. Track configuration file access and exports
4. Monitor for unusual outbound connections from router IP addresses
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة التوجيه D-Link DIR-605 في شبكتك باستخدام أدوات اكتشاف الأصول
2. عزل الأجهزة المتأثرة عن شبكات الإنتاج إذا لم يكن من الممكن تطبيق التصحيحات فوراً
3. تغيير جميع بيانات اعتماد المسؤول على أجهزة DIR-605 إلى كلمات مرور معقدة (16 حرفاً على الأقل)
4. تعطيل الوصول البعيد وتقييد وصول المسؤول إلى نطاقات IP موثوقة فقط
5. مراقبة سجلات جهاز التوجيه للطلبات المريبة إلى /getcfg.php

التصحيح:
1. تحميل أحدث البرامج الثابتة من بوابة دعم D-Link (التحقق من التوقيعات الرقمية)
2. تطبيق التصحيحات خلال نوافذ الصيانة مع موافقة إدارة التغيير
3. اختبار التصحيحات في بيئة المختبر قبل نشر الإنتاج
4. توثيق نشر التصحيح عبر جميع الأجهزة المتأثرة

الضوابط البديلة:
1. تنفيذ تقسيم الشبكة لعزل واجهات إدارة جهاز التوجيه
2. نشر قواعد WAF/IPS لحظر طلبات POST إلى /getcfg.php من مصادر غير موثوقة
3. تفعيل تسجيل مصادقة جهاز التوجيه وإعادة توجيه السجلات إلى SIEM
4. تنفيذ التحكم في الوصول إلى الشبكة (NAC) لتقييد الوصول إلى جهاز التوجيه
5. نشر توقيعات كشف الاختراق لمحاولات استغلال CVE-2021-40655

الكشف:
1. مراقبة طلبات POST إلى /getcfg.php في سجلات خادم الويب
2. التنبيه على محاولات المصادقة الفاشلة لواجهات إدارة جهاز التوجيه
3. تتبع الوصول إلى ملف التكوين والتصديرات
4. مراقبة الاتصالات الخارجية غير العادية من عناوين IP جهاز التوجيه
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.8.1 - Asset Management and Inventory ECC 2024 A.8.2 - Configuration Management ECC 2024 A.9.1 - Access Control Policy ECC 2024 A.9.2 - User Access Management ECC 2024 A.12.2 - Vulnerability Management ECC 2024 A.12.6 - Management of Technical Vulnerabilities
🔵 SAMA CSF
SAMA CSF ID.AM-1 - Physical and Cyber Assets SAMA CSF ID.AM-2 - Software Platforms and Applications SAMA CSF PR.AC-1 - Access Control Policy SAMA CSF PR.AC-4 - Access Rights Management SAMA CSF DE.CM-8 - Vulnerability Scans SAMA CSF RS.MI-2 - Incident Response Procedures
🟡 ISO 27001:2022
ISO 27001:2022 A.5.15 - Access Control ISO 27001:2022 A.8.1 - Asset Management ISO 27001:2022 A.8.2 - Configuration Management ISO 27001:2022 A.8.6 - Management of Technical Vulnerabilities ISO 27001:2022 A.12.2 - Logging ISO 27001:2022 A.12.6 - Management of Technical Vulnerabilities
🟣 PCI DSS v4.0
PCI DSS 1.1 - Firewall Configuration Standards PCI DSS 2.1 - Default Passwords PCI DSS 2.2 - Configuration Standards PCI DSS 6.2 - Security Patches PCI DSS 11.2 - Vulnerability Scanning
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
D-Link:DIR-605 Router
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS92.61%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2024-06-06
Published 2024-05-16
Source Feed cisa_kev
Views 1
🇸🇦 Saudi Risk Score
8.8
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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