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Improper input validation vulnerability in TP-Link System Inc. TL-WR940N V6 (UPnP modules), which allows unauthenticated adjacent attackers to perform DoS attack. This issue affects TL-WR940N V6 <= Build 220801.

CVE-2025-11676 identifies an improper input validation vulnerability (CWE-20) in the Universal Plug and Play (UPnP) modules of the TP-Link TL-WR940N V6 router, specifically affecting firmware versions up to Build 220801. The flaw allows unauthenticated attackers located on adjacent networks—such as those connected to the same local network segment or Wi-Fi—to send malformed input to the UPnP service, causing the device to crash or become unresponsive, resulting in a denial-of-service (DoS) condition. The vulnerability arises because the UPnP module fails to correctly validate incoming data, permitting crafted packets to disrupt normal operation. The CVSS v4.0 score of 7.1 reflects a high severity, with an attack vector classified as adjacent network (AV:A), no privileges or user interaction required, and a high impact on availability. No known exploits have been reported in the wild, but the lack of authentication and ease of triggering the DoS condition make this a significant risk. The affected product, TL-WR940N V6, is a widely deployed consumer and small business router, often used in home and small office environments. The absence of a patch link indicates that a fix may not yet be publicly available, emphasizing the need for interim mitigations.

Detailed information about CVE-2025-11676: CWE-20 Improper Input Validation in TP-Link System Inc. TL-WR940N V6 affecting TP-Link System Inc. TL-WR940N V6. Get 

CVE-2025-11676: CWE-20 Improper Input Validation in TP-Link System Inc. TL-WR940N V6 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-11676: CWE-20 Improper Input Validation in TP-Link System Inc. TL-WR940N V6

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