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Vulnerabilities

CVE-2025-9014

High
A Null Pointer Dereference vulnerability exists in the referer header check of the web portal of TP-Link TL-WR841N v14, caused by improper input validation.  A remote, unauthenticated attacker can exp
CWE-20 — Weakness Type
Published: Jan 15, 2026  ·  Modified: Feb 28, 2026  ·  Source: NVD
CVSS v3
7.5
🔗 NVD Official
📄 Description (English)

A Null Pointer Dereference vulnerability exists in the referer header check of the web portal of TP-Link TL-WR841N v14, caused by improper input validation.  A remote, unauthenticated attacker can exploit this flaw and cause Denial of Service on the web portal service.This issue affects TL-WR841N v14: before 250908.

🤖 AI Executive Summary

A null pointer dereference vulnerability in TP-Link TL-WR841N v14 router firmware allows unauthenticated remote attackers to cause denial of service against the web portal through improper referer header validation. The vulnerability affects firmware versions before 250908 and requires no authentication, making it easily exploitable. Organizations relying on these routers for network access should prioritize patching to prevent service disruption.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 2, 2026 23:37
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi organizations using TP-Link TL-WR841N v14 routers as network infrastructure. Primary impact sectors include: Government agencies and NCA infrastructure relying on these routers for network access; Banking and financial institutions (SAMA-regulated) using these devices in branch networks; Telecommunications providers (STC, Mobily) potentially deploying these routers; Healthcare facilities using these for network connectivity; Small to medium enterprises across all sectors. The DoS impact could disrupt critical network services, affecting business continuity and regulatory compliance. Given the prevalence of TP-Link routers in Saudi SME and government networks, widespread exploitation could cause significant operational disruption.
🏢 Affected Saudi Sectors
Government Banking and Financial Services Telecommunications Healthcare Energy and Utilities Small and Medium Enterprises Education
⚖️ Saudi Risk Score (AI)
7.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Identify all TP-Link TL-WR841N v14 devices in your network using network scanning tools
2. Implement network segmentation to restrict access to router web portals from untrusted networks
3. Disable remote management features on affected routers if not required
4. Monitor router logs for suspicious referer header patterns and DoS attempts

Patching Guidance:
1. Update firmware to version 250908 or later immediately
2. Download firmware from official TP-Link support portal (tp-link.com/sa for Saudi region)
3. Follow TP-Link's firmware update procedure: access router admin panel > System Tools > Firmware Upgrade
4. Verify successful update by checking firmware version in router settings

Compensating Controls (if immediate patching not possible):
1. Implement WAF/IPS rules to filter malformed referer headers
2. Restrict web portal access to specific IP ranges using firewall rules
3. Implement rate limiting on router web portal access
4. Deploy network monitoring to detect DoS patterns

Detection Rules:
1. Monitor for HTTP requests with null/malformed referer headers to router management interfaces
2. Alert on sudden spike in failed connections to router web portal (port 80/443)
3. Track firmware versions across network inventory for compliance tracking
4. Log and alert on any access attempts to router admin interfaces from unexpected sources
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة TP-Link TL-WR841N الإصدار 14 في شبكتك باستخدام أدوات المسح
2. تطبيق تقسيم الشبكة لتقييد الوصول إلى بوابات الويب للموجهات من الشبكات غير الموثوقة
3. تعطيل ميزات الإدارة البعيدة على الأجهزة المتأثرة إذا لم تكن مطلوبة
4. مراقبة سجلات الموجه للأنماط المريبة لرأس المرجع ومحاولات DoS

إرشادات التصحيح:
1. تحديث البرنامج الثابت إلى الإصدار 250908 أو أحدث فوراً
2. تنزيل البرنامج الثابت من بوابة دعم TP-Link الرسمية (tp-link.com/sa للمنطقة السعودية)
3. اتبع إجراء تحديث البرنامج الثابت: الوصول إلى لوحة إدارة الموجه > أدوات النظام > ترقية البرنامج الثابت
4. التحقق من نجاح التحديث بفحص إصدار البرنامج الثابت في إعدادات الموجه

الضوابط البديلة (إذا لم يكن التصحيح الفوري ممكناً):
1. تطبيق قواعد WAF/IPS لتصفية رؤوس المرجع المشوهة
2. تقييد وصول بوابة الويب إلى نطاقات IP محددة باستخدام قواعد جدار الحماية
3. تطبيق تحديد معدل الوصول إلى بوابة الويب للموجه
4. نشر مراقبة الشبكة للكشف عن أنماط DoS

قواعد الكشف:
1. مراقبة طلبات HTTP برؤوس مرجع فارغة/مشوهة إلى واجهات إدارة الموجه
2. التنبيه على الارتفاع المفاجئ في الاتصالات الفاشلة ببوابة الويب للموجه (المنفذ 80/443)
3. تتبع إصدارات البرنامج الثابت عبر جرد الشبكة للامتثال
4. تسجيل والتنبيه على أي محاولات وصول إلى واجهات إدارة الموجه من مصادر غير متوقعة
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Network security controls for infrastructure devices ECC 2024 A.5.2.1 - Vulnerability management and patching procedures ECC 2024 A.5.3.1 - Access control to network management interfaces ECC 2024 A.6.1.1 - Incident response for availability incidents
🔵 SAMA CSF
SAMA CSF ID.GV-1 - Organizational governance and risk management SAMA CSF PR.IP-1 - Information protection processes and procedures SAMA CSF PR.AC-1 - Access control policy and procedures SAMA CSF DE.CM-1 - Detection and analysis of anomalies
🟡 ISO 27001:2022
ISO 27001:2022 A.5.16 - Change management ISO 27001:2022 A.5.23 - Information security for supplier relationships ISO 27001:2022 A.8.1 - User endpoint devices ISO 27001:2022 A.8.6 - Management of technical vulnerabilities
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security patches and updates for system components PCI DSS 11.2 - Vulnerability scanning and remediation
📦 Affected Products / CPE 1 entries
tp-link:tl-wr841n_firmware
📊 CVSS Score
7.5
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityN — None / Network
IntegrityN — None / Network
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score7.5
CWECWE-20
EPSS0.13%
Exploit No
Patch ✓ Yes
Published 2026-01-15
Source Feed nvd
Views 5
🇸🇦 Saudi Risk Score
7.2
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
patch-available CWE-20
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