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Vulnerabilities

CVE-2026-5981

High
CWE-119 — Weakness Type
Published: Apr 9, 2026  ·  Modified: Apr 16, 2026  ·  Source: NVD
CVSS v3
8.8
🔗 NVD Official
📄 Description (English)

A vulnerability has been found in D-Link DIR-605L 2.13B01. This affects the function formAdvFirewall of the file /goform/formAdvFirewall of the component POST Request Handler. Such manipulation of the argument curTime leads to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

🤖 AI Executive Summary

A critical buffer overflow vulnerability exists in D-Link DIR-605L router firmware version 2.13B01 affecting the advanced firewall configuration function. The vulnerability can be exploited remotely through POST requests with malicious curTime parameters, potentially allowing unauthorized code execution. Since this product is end-of-life with no patch available, organizations must implement immediate compensating controls or device replacement.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 23, 2026 18:16
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi organizations using legacy D-Link DIR-605L routers, particularly in: (1) Banking sector (SAMA-regulated institutions) using these devices for branch connectivity or backup internet links; (2) Government agencies and critical infrastructure operators relying on aging network equipment; (3) Healthcare facilities with legacy network infrastructure; (4) Small-to-medium enterprises and retail operations across Saudi Arabia. The end-of-life status makes this especially critical as no vendor support is available. Organizations in regulated sectors (banking, healthcare, energy) face compliance violations if exploited.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Healthcare and Medical Facilities Energy and Utilities Telecommunications Retail and E-commerce Education Small and Medium Enterprises
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Inventory all D-Link DIR-605L devices across your organization and document their network criticality
2. Isolate affected routers from internet-facing positions immediately
3. Implement network segmentation to restrict access to the /goform/formAdvFirewall endpoint
4. Enable firewall rules to block POST requests to /goform/formAdvFirewall from untrusted sources
5. Monitor for suspicious POST requests with curTime parameters in firewall logs

COMPENSATING CONTROLS:
6. Deploy a Web Application Firewall (WAF) or IPS in front of affected devices to filter malicious POST requests
7. Implement strict input validation at network perimeter for any traffic destined to these devices
8. Restrict administrative access to these routers to specific trusted IP addresses only
9. Disable remote management features if not absolutely required
10. Enable detailed logging and alerting for all access attempts to the device

LONG-TERM REMEDIATION:
11. Develop a device replacement plan with timeline for upgrading to supported D-Link firmware versions or alternative vendors
12. Prioritize replacement for devices in critical network paths or handling sensitive data
13. For interim period, consider replacing with managed switches or modern routers with active vendor support

DETECTION RULES:
- Alert on POST requests to /goform/formAdvFirewall with curTime parameter containing special characters or exceeding normal length
- Monitor for multiple failed authentication attempts followed by POST requests to firewall configuration endpoints
- Track any firmware modification attempts or unexpected device reboots
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. قم بحصر جميع أجهزة D-Link DIR-605L في مؤسستك وتوثيق أهميتها في الشبكة
2. عزل الأجهزة المتأثرة عن المواضع المواجهة للإنترنت فوراً
3. تطبيق تقسيم الشبكة لتقييد الوصول إلى نقطة نهاية /goform/formAdvFirewall
4. تفعيل قواعد جدار الحماية لحظر طلبات POST إلى /goform/formAdvFirewall من مصادر غير موثوقة
5. مراقبة طلبات POST المريبة بمعاملات curTime في سجلات جدار الحماية

الضوابط التعويضية:
6. نشر جدار حماية تطبيقات الويب (WAF) أو نظام منع الاختراق أمام الأجهزة المتأثرة
7. تطبيق التحقق الصارم من المدخلات على محيط الشبكة لأي حركة مرور موجهة لهذه الأجهزة
8. تقييد الوصول الإداري لهذه الأجهزة إلى عناوين IP موثوقة محددة فقط
9. تعطيل ميزات الإدارة البعيدة إذا لم تكن مطلوبة بشكل مطلق
10. تفعيل السجلات التفصيلية والتنبيهات لجميع محاولات الوصول إلى الجهاز

العلاج طويل الأجل:
11. وضع خطة استبدال الأجهزة مع جدول زمني لترقية إصدارات D-Link المدعومة أو البدائل
12. إعطاء الأولوية لاستبدال الأجهزة في مسارات الشبكة الحرجة أو التي تتعامل مع بيانات حساسة
13. للفترة الانتقالية، يمكن استبدالها بمحاولات مُدارة أو أجهزة توجيه حديثة مع دعم البائع النشط

قواعد الكشف:
- تنبيه على طلبات POST إلى /goform/formAdvFirewall بمعامل curTime يحتوي على أحرف خاصة أو يتجاوز الطول الطبيعي
- مراقبة محاولات المصادقة الفاشلة المتعددة متبوعة بطلبات POST إلى نقاط نهاية إعدادات جدار الحماية
- تتبع أي محاولات تعديل البرنامج الثابت أو إعادة تشغيل الجهاز غير المتوقعة
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.8.1 - Asset Management and Inventory Control ECC 2024 A.8.2 - Information and Other Assets ECC 2024 A.13.1 - Network Security ECC 2024 A.14.2 - System Development and Maintenance ECC 2024 A.12.6 - Management of Technical Vulnerabilities
🔵 SAMA CSF
SAMA CSF ID.AM-1 - Physical Devices and Software Assets SAMA CSF PR.AC-1 - Access Control Policy SAMA CSF PR.DS-1 - Data Security SAMA CSF DE.CM-1 - Network Monitoring SAMA CSF RS.MI-1 - Incident Mitigation
🟡 ISO 27001:2022
ISO 27001:2022 A.5.9 - Access Control ISO 27001:2022 A.8.1 - Asset Management ISO 27001:2022 A.8.2 - Information Classification ISO 27001:2022 A.12.6 - Management of Technical Vulnerabilities ISO 27001:2022 A.14.2 - System Development and Maintenance
🟣 PCI DSS v4.0.1
PCI DSS 1.1 - Firewall Configuration Standards PCI DSS 2.1 - Default Passwords and Security Parameters PCI DSS 6.2 - Security Patches and Updates PCI DSS 11.2 - Vulnerability Scanning
📊 CVSS Score
8.8
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredL — Low / Local
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityH — High
IntegrityH — High
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score8.8
CWECWE-119
EPSS0.05%
Exploit No
Patch ✗ No
Published 2026-04-09
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
8.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
CWE-119
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