📄 Description (English)
A vulnerability was identified in D-Link DIR-825 3.00b32. This affects the function NMBD_process of the file sserver.c of the component nmbd. Such manipulation leads to buffer overflow. The attack can only be initiated within the local network. The exploit is publicly available and might be used. This vulnerability only affects products that are no longer supported by the maintainer.
🤖 AI Executive Summary
A buffer overflow vulnerability (CVE-2026-7068) exists in D-Link DIR-825 3.00b32 router's NMBD service, allowing local network attackers to execute arbitrary code with CVSS 8.8 severity. The vulnerability affects end-of-life products with no available patches, making it a persistent threat in organizations still using legacy D-Link equipment. Immediate network segmentation and device replacement are critical for Saudi organizations relying on this hardware.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 29, 2026 20:32
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi government agencies, educational institutions, and small-to-medium enterprises (SMEs) that may still operate legacy D-Link DIR-825 routers in their network infrastructure. Banking sector (SAMA-regulated) and healthcare organizations (MOH) are at risk if these devices are used in network perimeters or branch offices. Telecommunications providers (STC, Mobily, Zain) managing customer networks could face cascading impacts. Energy sector (ARAMCO, SEC) legacy network segments may be vulnerable. The local-network-only attack vector limits exposure but is critical for organizations with inadequate network segmentation.
🏢 Affected Saudi Sectors
Government and Public Administration
Banking and Financial Services
Healthcare and Medical Services
Telecommunications
Energy and Utilities
Education
Small and Medium Enterprises (SMEs)
🎯 MITRE ATT&CK Techniques
T1190 - Exploit Public-Facing Application (local network exploitation)
T1203 - Exploitation for Client Execution (buffer overflow execution)
T1548 - Abuse Elevation Control Mechanism (privilege escalation via NMBD)
T1021 - Remote Service Session Initiation (NMBD service exploitation)
T1059 - Command and Scripting Interpreter (arbitrary code execution)
T1562 - Impair Defenses (disable security controls post-exploitation)
⚖️ Saudi Risk Score (AI)
7.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Inventory all D-Link DIR-825 devices across the organization and document their network locations and criticality
2. Isolate affected devices from critical network segments using VLAN segmentation or air-gapping
3. Restrict administrative access to these devices to authorized personnel only
4. Disable NMBD service if not required for business operations
5. Monitor network traffic for suspicious NMBD communications (port 137-139, 445)
COMPENSATING CONTROLS:
6. Implement network access controls (NAC) to prevent unauthorized devices from connecting
7. Deploy intrusion detection/prevention systems (IDS/IPS) with signatures for buffer overflow attempts
8. Enforce strict firewall rules limiting NMBD traffic to trusted internal subnets only
9. Implement network segmentation with zero-trust architecture
10. Enable logging and alerting for NMBD service anomalies
LONG-TERM REMEDIATION:
11. Develop replacement plan for DIR-825 devices with supported, current-generation routers
12. Prioritize replacement in critical infrastructure (banking, healthcare, government)
13. Conduct security assessment of all legacy network equipment
14. Implement regular vulnerability scanning for remaining legacy devices
DETECTION RULES:
- Monitor for unexpected NMBD process crashes or restarts
- Alert on unusual memory access patterns in sserver.c execution
- Track failed NMBD authentication attempts from internal IPs
- Flag oversized NMBD packets exceeding normal protocol specifications
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. إجراء جرد شامل لجميع أجهزة D-Link DIR-825 في المنظمة وتوثيق مواقعها ودرجة أهميتها
2. عزل الأجهزة المتأثرة عن القطاعات الحرجة في الشبكة باستخدام تقسيم VLAN أو الفصل الكامل
3. تقييد الوصول الإداري لهذه الأجهزة للموظفين المصرح لهم فقط
4. تعطيل خدمة NMBD إذا لم تكن مطلوبة للعمليات التجارية
5. مراقبة حركة المرور على الشبكة للكشف عن اتصالات NMBD المريبة (المنافذ 137-139، 445)
الضوابط البديلة:
6. تطبيق ضوابط الوصول إلى الشبكة (NAC) لمنع الأجهزة غير المصرح بها من الاتصال
7. نشر أنظمة كشف/منع الاختراق (IDS/IPS) مع توقيعات لمحاولات تجاوز المخزن المؤقت
8. فرض قواعد جدار الحماية الصارمة لتقييد حركة NMBD للشبكات الداخلية الموثوقة فقط
9. تطبيق تقسيم الشبكة مع معمارية الثقة الصفرية
10. تفعيل التسجيل والتنبيهات لشذوذ خدمة NMBD
العلاج طويل الأجل:
11. وضع خطة استبدال لأجهزة DIR-825 بأجهزة توجيه حديثة مدعومة
12. إعطاء الأولوية للاستبدال في البنية التحتية الحرجة (البنوك والرعاية الصحية والحكومة)
13. إجراء تقييم أمني لجميع معدات الشبكة القديمة
14. تطبيق المسح الدوري للثغرات الأمنية للأجهزة القديمة المتبقية
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.8.1 - Asset Management (inventory and management of legacy devices)
ECC 2024 A.8.2 - Configuration Management (secure configuration of network devices)
ECC 2024 A.13.1 - Network Security (network segmentation and access controls)
ECC 2024 A.14.2 - System Development and Maintenance (patch management and lifecycle)
🔵 SAMA CSF
Identify - Asset Management (identification of vulnerable legacy systems)
Protect - Access Control (network segmentation and NMBD service restrictions)
Protect - Data Security (isolation of critical systems from vulnerable devices)
Detect - Anomalies and Events (monitoring NMBD service for exploitation attempts)
Respond - Incident Management (containment procedures for compromised routers)
🟡 ISO 27001:2022
A.5.19 - Inventory of information and other assets
A.8.1 - Screening (assessment of legacy device security status)
A.8.3 - Terms and conditions of employment (secure handling of network infrastructure)
A.13.1 - Network controls (network segmentation and access restrictions)
A.14.2 - System development lifecycle (patch management and device replacement)
🟣 PCI DSS v4.0.1
Requirement 1.1 - Firewall configuration standards (network segmentation)
Requirement 2.1 - Default security parameters (disable unnecessary services)
Requirement 6.2 - Security patches (legacy device management strategy)
Requirement 11.2 - Vulnerability scanning (legacy device assessment)
🔗 References & Sources 5
🔗
https://tzh00203.notion.site/D-Link-DIR-825-nmbd-NetBIOS-Name-Service-Stack-Based-Buffe...
cna@vuldb.com
Exploit
Mitigation
Third Party Advisory
🔗
https://vuldb.com/submit/798646
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://vuldb.com/vuln/359643
cna@vuldb.com
Third Party Advisory
VDB Entry
🔗
https://vuldb.com/vuln/359643/cti
cna@vuldb.com
Permissions Required
VDB Entry
🔗
https://www.dlink.com/
cna@vuldb.com
Product
📦 Affected Products / CPE 1 entries
dlink:dir-825_firmware:3.00b32