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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.

CVE-2025-9014 identifies a vulnerability in the TP-Link TL-WR841N v14 router, specifically in the web portal's handling of the HTTP referer header. The root cause is improper input validation, classified under CWE-20, which leads to a Null Pointer Dereference condition. When the web portal processes a crafted referer header, it dereferences a null pointer, causing the web service to crash and resulting in a denial of service (DoS). This vulnerability can be exploited remotely without authentication or user interaction, making it accessible to any attacker capable of sending HTTP requests to the router's management interface. The affected firmware versions are those prior to build 250908. The CVSS 4.0 base score is 6.3, reflecting a medium severity level, with attack vector network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and low impact on availability (VA:L). There is no impact on confidentiality or integrity. No known exploits have been reported in the wild yet. The vulnerability primarily threatens the availability of the router's management interface, potentially disrupting network administration and causing temporary loss of control over the device. The lack of authentication requirement increases the risk, especially if the router's web interface is exposed to untrusted networks. However, the impact is limited to the web portal service and does not directly compromise the router's core functionality or data confidentiality. The vulnerability highlights the importance of robust input validation in embedded device web interfaces and the risks posed by exposing management portals to external networks.

Detailed information about CVE-2025-9014: CWE-20 Improper Input Validation in TP-Link Systems Inc. TL-WR841N v14 affecting TP-Link Systems Inc. TL-WR841N v14. G

CVE-2025-9014: CWE-20 Improper Input Validation in TP-Link Systems Inc. TL-WR841N v14 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-9014: CWE-20 Improper Input Validation in TP-Link Systems Inc. TL-WR841N v14

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